1323 lines
52 KiB
Python
1323 lines
52 KiB
Python
import os, re, yara, time, math, json, zlib, numpy
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import pefile, threading, onnxruntime, datetime, requests
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import ctypes, ctypes.wintypes
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####################################################################################################
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class GUID(ctypes.Structure):
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_fields_ = [
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("Data1", ctypes.wintypes.DWORD),
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("Data2", ctypes.wintypes.WORD),
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("Data3", ctypes.wintypes.WORD),
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("Data4", ctypes.c_ubyte * 8)
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]
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class WINTRUST_FILE_INFO(ctypes.Structure):
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_fields_ = [
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("cbStruct", ctypes.wintypes.DWORD),
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("pcwszFilePath", ctypes.wintypes.LPCWSTR),
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("hFile", ctypes.wintypes.HANDLE),
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("pgKnownSubject", ctypes.wintypes.LPVOID)
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]
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class WINTRUST_DATA_UNION(ctypes.Union):
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_fields_ = [
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("pFile", ctypes.POINTER(WINTRUST_FILE_INFO)),
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("pCatalog", ctypes.wintypes.LPVOID),
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("pBlob", ctypes.wintypes.LPVOID),
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("pSgnr", ctypes.wintypes.LPVOID),
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("pCert", ctypes.wintypes.LPVOID)
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]
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class WINTRUST_DATA(ctypes.Structure):
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_fields_ = [
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("cbStruct", ctypes.wintypes.DWORD),
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("pPolicyCallbackData", ctypes.wintypes.LPVOID),
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("pSIPClientData", ctypes.wintypes.LPVOID),
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("dwUIChoice", ctypes.wintypes.DWORD),
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("fdwRevocationChecks", ctypes.wintypes.DWORD),
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("dwUnionChoice", ctypes.wintypes.DWORD),
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("u", WINTRUST_DATA_UNION),
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("dwStateAction", ctypes.wintypes.DWORD),
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("hWVTStateData", ctypes.wintypes.HANDLE),
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("pwszURLReference", ctypes.wintypes.LPCWSTR),
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("dwProvFlags", ctypes.wintypes.DWORD),
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("dwUIContext", ctypes.wintypes.DWORD),
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("pSignatureSettings", ctypes.wintypes.LPVOID)
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]
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####################################################################################################
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class sign_scanner:
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def __init__(self):
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self.verify = GUID(0x00AAC56B, 0xCD44, 0x11D0, (ctypes.c_ubyte * 8)(0x8C, 0xC2, 0x00, 0xC0, 0x4F, 0xC2, 0x95, 0xEE))
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def init_windll(self, path):
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for name in path:
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try:
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setattr(self, name.lower(), ctypes.WinDLL(name, use_last_error=True))
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except Exception:
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pass
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try:
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self.WinVerifyTrust = self.wintrust.WinVerifyTrust
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self.WinVerifyTrust.restype = ctypes.wintypes.LONG
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self.WinVerifyTrust.argtypes = [ctypes.wintypes.HWND, ctypes.POINTER(GUID), ctypes.c_void_p]
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except Exception:
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pass
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####################################################################################################
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def sign_verify(self, file_path):
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if os.name != 'nt':
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return False
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try:
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fi = WINTRUST_FILE_INFO()
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fi.cbStruct = ctypes.sizeof(WINTRUST_FILE_INFO)
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fi.pcwszFilePath = os.path.abspath(file_path)
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fi.hFile = None
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fi.pgKnownSubject = None
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wt_union = WINTRUST_DATA_UNION()
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wt_union.pFile = ctypes.pointer(fi)
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td = WINTRUST_DATA()
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td.cbStruct = ctypes.sizeof(WINTRUST_DATA)
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td.pPolicyCallbackData = None
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td.pSIPClientData = None
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td.dwUIChoice = 2
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td.fdwRevocationChecks = 0
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td.dwUnionChoice = 1
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td.u = wt_union
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td.dwStateAction = 0
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td.hWVTStateData = None
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td.pwszURLReference = None
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td.dwProvFlags = 0
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td.dwUIContext = 0
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td.pSignatureSettings = None
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return self.WinVerifyTrust(None, ctypes.byref(self.verify), ctypes.byref(td)) == 0
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except Exception:
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return False
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####################################################################################################
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class rule_scanner:
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def __init__(self):
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self.rules = None
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self.network = []
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def load_path(self, path, callback=None):
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yara_files = {}
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for root, _, files in os.walk(path):
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for file in files:
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full_path = os.path.join(root, file)
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if callback:
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callback(full_path)
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ext = os.path.splitext(file)[1].lower()
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if ext in ('.yara', '.yar'):
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namespace = os.path.relpath(full_path, path).replace(os.sep, '_')
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yara_files[namespace] = full_path
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elif ext in ('.yc', '.yrc'):
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self.load_compiled_rule(full_path)
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elif ext in ('.ip', '.txt'):
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self.load_network_list(full_path)
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if yara_files:
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self.compile_all_rules(yara_files)
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####################################################################################################
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def load_compiled_rule(self, file):
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try:
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self.rules = yara.load(file)
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except Exception:
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pass
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def load_network_list(self, file):
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try:
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with open(file, "r", encoding="utf-8", errors="ignore") as f:
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self.network.extend(line.strip() for line in f if line.strip())
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except Exception:
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pass
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def compile_all_rules(self, file_map):
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try:
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self.rules = yara.compile(filepaths=file_map)
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except Exception:
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pass
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####################################################################################################
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def yara_scan(self, file_path):
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try:
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if not self.rules:
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return False, False
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matches = self.rules.match(filepath=file_path)
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if matches:
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rule_name = str(matches[0])
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try:
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label = rule_name.split("_")[0]
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platform = rule_name.split("_")[1]
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family = rule_name.split("_")[2]
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return f"{label}:{platform}/{family}.{len(matches)}!yr", 100
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except Exception:
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return rule_name, 100
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return False, False
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except Exception:
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return False, False
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def yara_mem_scan(self, pid):
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try:
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if not self.rules:
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return False, False
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matches = self.rules.match(pid=pid)
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if matches:
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rule_name = str(matches[0])
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try:
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label = rule_name.split("_")[0]
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platform = rule_name.split("_")[1]
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family = rule_name.split("_")[2]
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return f"{label}:{platform}/{family}.{len(matches)}!ym", 100
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except Exception:
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return rule_name, 100
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return False, False
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except Exception:
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return False, False
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####################################################################################################
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def _entropy_from_counts(counts, size):
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if size <= 0:
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return 0.0
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nonzero = counts[counts > 0]
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return float(numpy.log2(size) - numpy.sum(nonzero * numpy.log2(nonzero)) / size)
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def _bounded_entropy(data, batch_size=1048576):
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size = len(data)
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if size == 0:
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return 0.0
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counts = numpy.zeros(256, dtype=numpy.int64)
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view = memoryview(data)
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try:
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for start in range(0, size, batch_size):
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chunk = numpy.frombuffer(
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view[start:min(start + batch_size, size)], dtype=numpy.uint8
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)
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counts += numpy.bincount(chunk, minlength=256)
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finally:
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view.release()
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return _entropy_from_counts(counts, size)
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def _accumulate_string_chunk(chunk, array, state, pattern):
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separators = (array < 0x20) | (array > 0x7E)
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if not separators.any():
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state["pending_counts"] += numpy.bincount(array, minlength=256)
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state["pending_length"] += len(array)
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return
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first_separator = int(numpy.argmax(separators))
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last_separator = len(separators) - 1 - int(numpy.argmax(separators[::-1]))
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if first_separator:
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state["pending_counts"] += numpy.bincount(
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array[:first_separator], minlength=256
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)
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state["pending_length"] += first_separator
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if state["pending_length"] >= 5:
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state["count"] += 1
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state["total_length"] += state["pending_length"]
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state["counts"] += state["pending_counts"]
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state["pending_length"] = 0
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state["pending_counts"].fill(0)
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middle_start = first_separator + 1
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middle_end = last_separator
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if middle_end > middle_start:
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matches = pattern.findall(chunk[middle_start:middle_end])
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if matches:
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combined = b"".join(matches)
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state["count"] += len(matches)
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state["total_length"] += len(combined)
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state["counts"] += numpy.bincount(
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numpy.frombuffer(combined, dtype=numpy.uint8), minlength=256
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)
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trailing_start = last_separator + 1
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if trailing_start < len(array):
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trailing = array[trailing_start:]
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state["pending_counts"] += numpy.bincount(trailing, minlength=256)
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state["pending_length"] = len(trailing)
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def _accumulate_entropy_windows(data, entropy_histogram, c_log_c_table):
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block_count = len(data) // 1024
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if block_count < 2:
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return data
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complete_size = block_count * 1024
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blocks = numpy.frombuffer(
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data, dtype=numpy.uint8, count=complete_size
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).reshape(block_count, 1024)
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encoded = blocks.astype(numpy.int32)
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encoded += numpy.arange(block_count, dtype=numpy.int32)[:, None] * 256
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block_counts = numpy.bincount(
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encoded.ravel(), minlength=block_count * 256
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).reshape(block_count, 256)
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window_counts = block_counts[:-1] + block_counts[1:]
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sum_c_log_c = numpy.sum(c_log_c_table[window_counts], axis=1)
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entropies = 11.0 - sum_c_log_c / 2048.0
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entropy_bins = (entropies * 2.0).astype(numpy.int32)
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numpy.clip(entropy_bins, 0, 15, out=entropy_bins)
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byte_bins = window_counts.reshape(block_count - 1, 16, 16).sum(axis=2)
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flat_indices = (entropy_bins[:, None] * 16 + numpy.arange(16)).ravel()
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numpy.add.at(entropy_histogram, flat_indices, byte_bins.ravel())
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return data[(block_count - 1) * 1024:]
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def _collect_resource_ranges(pe, file_size):
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ranges = []
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if not hasattr(pe, "DIRECTORY_ENTRY_RESOURCE"):
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return ranges
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for entry_type in pe.DIRECTORY_ENTRY_RESOURCE.entries:
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for entry_id in getattr(
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getattr(entry_type, "directory", None), "entries", []
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):
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for entry_lang in getattr(
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getattr(entry_id, "directory", None), "entries", []
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):
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if not hasattr(entry_lang, "data"):
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continue
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try:
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struct = entry_lang.data.struct
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offset = int(pe.get_offset_from_rva(int(struct.OffsetToData)))
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size = int(struct.Size)
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start = max(0, offset)
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end = min(file_size, start + max(0, size))
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ranges.append((start, max(start, end)))
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except Exception:
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ranges.append((0, 0))
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return ranges
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def _extract_stream_features(file_path, file_size, ranges, extractor):
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normalized = []
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for start, end in ranges:
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start = max(0, min(file_size, int(start)))
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end = max(start, min(file_size, int(end)))
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normalized.append((start, end))
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byte_counts = numpy.zeros(256, dtype=numpy.int64)
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range_counts = [numpy.zeros(256, dtype=numpy.int64) for _ in normalized]
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entropy_histogram = numpy.zeros(256, dtype=numpy.float64)
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string_state = {
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"count": 0,
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"total_length": 0,
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"counts": numpy.zeros(256, dtype=numpy.int64),
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"pending_length": 0,
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"pending_counts": numpy.zeros(256, dtype=numpy.int64),
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}
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histogram_tail = b""
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position = 0
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with open(file_path, "rb") as source:
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while True:
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chunk = source.read(4194304)
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if not chunk:
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break
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array = numpy.frombuffer(chunk, dtype=numpy.uint8)
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_accumulate_string_chunk(
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chunk, array, string_state, extractor._STRING_PATTERN
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)
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histogram_tail = _accumulate_entropy_windows(
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histogram_tail + chunk,
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entropy_histogram,
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extractor._C_LOG_C_TABLE,
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)
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chunk_end = position + len(chunk)
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boundaries = {0, len(chunk)}
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for start, end in normalized:
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if position < start < chunk_end:
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boundaries.add(start - position)
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if position < end < chunk_end:
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boundaries.add(end - position)
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ordered = sorted(boundaries)
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for index in range(len(ordered) - 1):
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local_start = ordered[index]
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local_end = ordered[index + 1]
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if local_end <= local_start:
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continue
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counts = numpy.bincount(
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array[local_start:local_end], minlength=256
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)
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byte_counts += counts
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absolute_start = position + local_start
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absolute_end = position + local_end
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for range_index, (start, end) in enumerate(normalized):
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if start <= absolute_start and absolute_end <= end:
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range_counts[range_index] += counts
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position = chunk_end
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if string_state["pending_length"] >= 5:
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string_state["count"] += 1
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string_state["total_length"] += string_state["pending_length"]
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string_state["counts"] += string_state["pending_counts"]
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string_count = string_state["count"]
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total_string_length = string_state["total_length"]
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result = {
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"StringCount": float(string_count),
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"StringMeanLength": (
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float(total_string_length) / string_count if string_count else 0.0
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),
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"StringEntropy": _entropy_from_counts(
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string_state["counts"], total_string_length
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),
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}
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result.update(dict.fromkeys(extractor._STRING_KEYS, 0.0))
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if total_string_length:
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valid_counts = string_state["counts"][0x20:0x7F]
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result.update(dict(zip(
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extractor._STRING_KEYS,
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valid_counts.astype(numpy.float64) / total_string_length,
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)))
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result["FileEntropy"] = _entropy_from_counts(byte_counts, file_size)
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result.update(dict(zip(
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extractor._BYTE_HIST_KEYS,
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byte_counts.astype(numpy.float64) / file_size,
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)))
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entropy_sum = numpy.sum(entropy_histogram)
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if entropy_sum:
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entropy_histogram /= entropy_sum
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result.update(dict(zip(extractor._BYTE_ENT_KEYS, entropy_histogram)))
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range_entropies = [
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_entropy_from_counts(counts, end - start)
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for counts, (start, end) in zip(range_counts, normalized)
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]
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return result, range_entropies
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####################################################################################################
|
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|
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class pe_scanner:
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_STRING_PATTERN = re.compile(b'[\x20-\x7E]{5,}')
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_STRING_FAST_PATH_BYTES = 4194304
|
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_STRING_BATCH_BYTES = 4194304
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_HISTOGRAM_BATCH_WINDOWS = 1024
|
|
|
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_BYTE_HIST_KEYS = [f'ByteHist_{i:02X}' for i in range(256)]
|
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_BYTE_ENT_KEYS = [f'ByteEnt_{i:02X}' for i in range(256)]
|
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_STRING_KEYS = [f'StringHist_{i:02d}' for i in range(95)]
|
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_SECTION_HASH_KEYS = [f'SectionHash_{i:02d}' for i in range(50)]
|
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|
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_CHAR_FLAGS = [0x00000020, 0x00000040, 0x00000080, 0x02000000, 0x20000000, 0x40000000, 0x80000000]
|
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_CHAR_COUNT_KEYS = {flag: f'Char_{flag:08X}_Count' for flag in _CHAR_FLAGS}
|
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_CHAR_ENT_KEYS = {flag: f'Char_{flag:08X}_MeanEntropy' for flag in _CHAR_FLAGS}
|
|
|
|
_C_LOG_C_TABLE = numpy.zeros(2049, dtype=numpy.float64)
|
|
_C_LOG_C_TABLE[1:] = numpy.arange(1, 2049) * numpy.log2(numpy.arange(1, 2049))
|
|
|
|
_OPTIONAL_HEADER_FIELDS = [
|
|
'Magic', 'MajorLinkerVersion', 'MinorLinkerVersion', 'SizeOfCode',
|
|
'SizeOfInitializedData', 'SizeOfUninitializedData', 'AddressOfEntryPoint',
|
|
'BaseOfCode', 'ImageBase', 'SectionAlignment', 'FileAlignment',
|
|
'MajorOperatingSystemVersion', 'MinorOperatingSystemVersion',
|
|
'MajorImageVersion', 'MinorImageVersion', 'MajorSubsystemVersion',
|
|
'MinorSubsystemVersion', 'SizeOfImage', 'SizeOfHeaders', 'CheckSum',
|
|
'Subsystem', 'DllCharacteristics', 'SizeOfStackReserve', 'SizeOfStackCommit',
|
|
'SizeOfHeapReserve', 'SizeOfHeapCommit', 'LoaderFlags', 'NumberOfRvaAndSizes'
|
|
]
|
|
|
|
_SECTION_DEFAULTS = {
|
|
'SectionCount': 0.0,
|
|
'SectionMaxEntropy': 0.0,
|
|
'SectionMinEntropy': 0.0,
|
|
'SectionMeanEntropy': 0.0,
|
|
'SectionMaxRawSize': 0.0,
|
|
'SectionMinRawSize': 0.0,
|
|
'SectionMeanRawSize': 0.0,
|
|
'SectionMaxVSize': 0.0,
|
|
'SectionMinVSize': 0.0,
|
|
'SectionMeanVSize': 0.0,
|
|
'ExecutableSections': 0.0,
|
|
'WritableSections': 0.0,
|
|
'ReadableSections': 0.0,
|
|
'SectionException': 0.0
|
|
}
|
|
|
|
_CONDITIONAL_DEFAULTS = {
|
|
'IsDriver': 0.0,
|
|
'HasTlsCallbacks': 0.0,
|
|
'IsDebug': 0.0,
|
|
'IsPreRelease': 0.0,
|
|
'IsPatched': 0.0,
|
|
'IsPrivateBuild': 0.0,
|
|
'IsSpecialBuild': 0.0,
|
|
'ImportCount': 0.0,
|
|
'ImportFunctionCount': 0.0,
|
|
'ExportCount': 0.0,
|
|
'IconCount': 0.0,
|
|
'DebugCount': 0.0
|
|
}
|
|
|
|
####################################################################################################
|
|
|
|
def __init__(self):
|
|
self.model = None
|
|
self.input_name = None
|
|
self.feature_order = []
|
|
self.dll_hash_dim = 512
|
|
self.api_hash_dim = 4096
|
|
self.dll_hash_pad = 3
|
|
self.api_hash_pad = 4
|
|
self.signer = sign_scanner()
|
|
self.signer.init_windll(["wintrust"])
|
|
|
|
def load_path(self, path, callback=None):
|
|
for root, _, files in os.walk(path):
|
|
for file in files:
|
|
full_path = os.path.join(root, file)
|
|
|
|
if callback:
|
|
callback(full_path)
|
|
|
|
if full_path.endswith('.onnx'):
|
|
self.load_model(full_path)
|
|
|
|
def load_model(self, model_path):
|
|
if not os.path.exists(model_path):
|
|
return
|
|
|
|
try:
|
|
self.model = onnxruntime.InferenceSession(model_path, providers=['CPUExecutionProvider'])
|
|
self.input_name = self.model.get_inputs()[0].name
|
|
|
|
feat_path = os.path.join(os.path.dirname(model_path), "features.json")
|
|
if os.path.exists(feat_path):
|
|
with open(feat_path, 'r', encoding='utf-8') as f:
|
|
self.feature_order = json.load(f)
|
|
|
|
self._parse_hash_dims()
|
|
except Exception:
|
|
pass
|
|
|
|
####################################################################################################
|
|
|
|
def _parse_hash_dims(self):
|
|
max_dll = -1
|
|
max_api = -1
|
|
|
|
for feat in self.feature_order:
|
|
if feat.startswith("DllHash_"):
|
|
try:
|
|
val_str = feat.split("_")[1]
|
|
max_dll = max(max_dll, int(val_str))
|
|
self.dll_hash_pad = len(val_str)
|
|
except Exception:
|
|
pass
|
|
elif feat.startswith("ApiHash_"):
|
|
try:
|
|
val_str = feat.split("_")[1]
|
|
max_api = max(max_api, int(val_str))
|
|
self.api_hash_pad = len(val_str)
|
|
except Exception:
|
|
pass
|
|
|
|
if max_dll >= 0:
|
|
self.dll_hash_dim = max_dll + 1
|
|
if max_api >= 0:
|
|
self.api_hash_dim = max_api + 1
|
|
|
|
def _safe_float(self, val):
|
|
try:
|
|
f = float(val)
|
|
if math.isinf(f) or math.isnan(f):
|
|
return 0.0
|
|
|
|
return f
|
|
except Exception:
|
|
return 0.0
|
|
|
|
def _base_defaults(self):
|
|
base = dict.fromkeys(self._OPTIONAL_HEADER_FIELDS, 0.0)
|
|
base.update(self._SECTION_DEFAULTS)
|
|
base.update(self._CONDITIONAL_DEFAULTS)
|
|
|
|
for i in range(16):
|
|
base[f'DataDirectory_{i}_Size'] = 0.0
|
|
base[f'DataDirectory_{i}_VA'] = 0.0
|
|
|
|
return base
|
|
|
|
def _calc_entropy(self, data):
|
|
return _bounded_entropy(data)
|
|
|
|
def _extract_strings(self, file_bytes):
|
|
res = {"StringCount": 0.0, "StringMeanLength": 0.0, "StringEntropy": 0.0}
|
|
res.update(dict.fromkeys(self._STRING_KEYS, 0.0))
|
|
|
|
if len(file_bytes) <= self._STRING_FAST_PATH_BYTES:
|
|
matches = self._STRING_PATTERN.findall(file_bytes)
|
|
if not matches:
|
|
return res
|
|
|
|
combined_data = b''.join(matches)
|
|
count = len(matches)
|
|
total_len = len(combined_data)
|
|
global_counts = numpy.bincount(numpy.frombuffer(combined_data, dtype=numpy.uint8), minlength=256)
|
|
else:
|
|
count = 0
|
|
total_len = 0
|
|
global_counts = numpy.zeros(256, dtype=numpy.int64)
|
|
mv = memoryview(file_bytes)
|
|
pos = 0
|
|
size = len(file_bytes)
|
|
|
|
while pos < size:
|
|
chunk_end = min(pos + self._STRING_BATCH_BYTES, size)
|
|
chunk_arr = numpy.frombuffer(mv[pos:chunk_end], dtype=numpy.uint8)
|
|
separators = (chunk_arr < 0x20) | (chunk_arr > 0x7E)
|
|
|
|
if separators.any():
|
|
last_separator = len(separators) - 1 - int(numpy.argmax(separators[::-1]))
|
|
segment_end = pos + last_separator + 1
|
|
matches = self._STRING_PATTERN.findall(mv[pos:segment_end])
|
|
|
|
if matches:
|
|
combined_data = b''.join(matches)
|
|
count += len(matches)
|
|
total_len += len(combined_data)
|
|
global_counts += numpy.bincount(numpy.frombuffer(combined_data, dtype=numpy.uint8), minlength=256)
|
|
|
|
pos = segment_end
|
|
continue
|
|
|
|
pending_len = 0
|
|
pending_counts = numpy.zeros(256, dtype=numpy.int64)
|
|
|
|
while pos < size:
|
|
chunk_end = min(pos + self._STRING_BATCH_BYTES, size)
|
|
chunk_arr = numpy.frombuffer(mv[pos:chunk_end], dtype=numpy.uint8)
|
|
separators = (chunk_arr < 0x20) | (chunk_arr > 0x7E)
|
|
|
|
if separators.any():
|
|
first_separator = int(numpy.argmax(separators))
|
|
if first_separator:
|
|
pending_counts += numpy.bincount(chunk_arr[:first_separator], minlength=256)
|
|
pending_len += first_separator
|
|
pos += first_separator + 1
|
|
break
|
|
|
|
pending_counts += numpy.bincount(chunk_arr, minlength=256)
|
|
pending_len += len(chunk_arr)
|
|
pos = chunk_end
|
|
|
|
if pending_len >= 5:
|
|
count += 1
|
|
total_len += pending_len
|
|
global_counts += pending_counts
|
|
|
|
if count == 0 or total_len == 0:
|
|
return res
|
|
|
|
res["StringCount"] = float(count)
|
|
res["StringMeanLength"] = float(total_len) / count
|
|
|
|
counts_nonzero = global_counts[global_counts > 0]
|
|
if len(counts_nonzero) > 0:
|
|
res["StringEntropy"] = float(numpy.log2(total_len) - numpy.sum(counts_nonzero * numpy.log2(counts_nonzero)) / total_len)
|
|
|
|
valid_chars = global_counts[0x20:0x7F]
|
|
res.update(dict(zip(self._STRING_KEYS, valid_chars.astype(numpy.float64) / total_len)))
|
|
|
|
return res
|
|
|
|
####################################################################################################
|
|
|
|
def _extract_histograms(self, file_bytes):
|
|
arr = numpy.frombuffer(file_bytes, dtype=numpy.uint8)
|
|
sz = len(arr)
|
|
res = {}
|
|
|
|
if sz == 0:
|
|
res['FileEntropy'] = 0.0
|
|
res.update(dict.fromkeys(self._BYTE_HIST_KEYS, 0.0))
|
|
res.update(dict.fromkeys(self._BYTE_ENT_KEYS, 0.0))
|
|
return res
|
|
|
|
byte_counts = numpy.zeros(256, dtype=numpy.int64)
|
|
ent_hist = numpy.zeros(256, dtype=numpy.float64)
|
|
window = 2048
|
|
step = 1024
|
|
|
|
if sz < window:
|
|
byte_counts += numpy.bincount(arr, minlength=256)
|
|
p = byte_counts[byte_counts > 0] / float(sz)
|
|
entropy = float(-numpy.sum(p * numpy.log2(p)))
|
|
ent_bin = min(int(entropy * 2.0), 15)
|
|
byte_bins = byte_counts.reshape(16, 16).sum(axis=1)
|
|
idx_start = ent_bin * 16
|
|
ent_hist[idx_start : idx_start+16] += byte_bins
|
|
else:
|
|
num_windows = (sz - window) // step + 1
|
|
|
|
for w_start in range(0, num_windows, self._HISTOGRAM_BATCH_WINDOWS):
|
|
w_end = min(w_start + self._HISTOGRAM_BATCH_WINDOWS, num_windows)
|
|
b_num = w_end - w_start
|
|
|
|
start_byte = w_start * step
|
|
end_byte = start_byte + b_num * step + step
|
|
encoded = arr[start_byte:end_byte].astype(numpy.int32).reshape(b_num + 1, step)
|
|
encoded += numpy.arange(b_num + 1, dtype=numpy.int32)[:, None] * 256
|
|
|
|
chunk_counts = numpy.bincount(encoded.ravel(), minlength=(b_num + 1) * 256).reshape(b_num + 1, 256)
|
|
del encoded
|
|
|
|
byte_counts += numpy.sum(chunk_counts[:-1], axis=0)
|
|
if w_end == num_windows:
|
|
byte_counts += chunk_counts[-1]
|
|
|
|
window_counts = chunk_counts[:-1] + chunk_counts[1:]
|
|
sum_c_log_c = numpy.sum(self._C_LOG_C_TABLE[window_counts], axis=1)
|
|
entropies = 11.0 - sum_c_log_c / 2048.0
|
|
|
|
ent_bins = (entropies * 2.0).astype(numpy.int32)
|
|
numpy.clip(ent_bins, 0, 15, out=ent_bins)
|
|
|
|
byte_bins = window_counts.reshape(b_num, 16, 16).sum(axis=2)
|
|
flat_ent_bins = (ent_bins[:, None] * 16 + numpy.arange(16)).ravel()
|
|
numpy.add.at(ent_hist, flat_ent_bins, byte_bins.ravel())
|
|
|
|
covered_size = (num_windows + 1) * step
|
|
if covered_size < sz:
|
|
byte_counts += numpy.bincount(arr[covered_size:], minlength=256)
|
|
|
|
counts_nonzero = byte_counts[byte_counts > 0]
|
|
res['FileEntropy'] = float(numpy.log2(sz) - numpy.sum(counts_nonzero * numpy.log2(counts_nonzero)) / sz)
|
|
|
|
byte_hist = byte_counts.astype(numpy.float64) / sz
|
|
res.update(dict(zip(self._BYTE_HIST_KEYS, byte_hist)))
|
|
|
|
ent_sum = numpy.sum(ent_hist)
|
|
if ent_sum > 0:
|
|
ent_hist /= ent_sum
|
|
|
|
res.update(dict(zip(self._BYTE_ENT_KEYS, ent_hist)))
|
|
return res
|
|
|
|
def _extract_overlay_features(self, pe, fsize):
|
|
overlay_offset = pe.get_overlay_data_start_offset()
|
|
if not overlay_offset or overlay_offset >= fsize:
|
|
return {"HasOverlay": 0.0, "OverlaySize": 0.0, "OverlayRatio": 0.0, "OverlayEntropy": 0.0}
|
|
|
|
overlay_data = pe.get_overlay()
|
|
if not overlay_data:
|
|
return {"HasOverlay": 0.0, "OverlaySize": 0.0, "OverlayRatio": 0.0, "OverlayEntropy": 0.0}
|
|
|
|
sz = len(overlay_data)
|
|
return {
|
|
"HasOverlay": 1.0,
|
|
"OverlaySize": float(sz),
|
|
"OverlayRatio": float(sz) / float(fsize),
|
|
"OverlayEntropy": self._calc_entropy(overlay_data)
|
|
}
|
|
|
|
def _extract_rich_header(self, pe):
|
|
if not hasattr(pe, 'RICH_HEADER') or not pe.RICH_HEADER:
|
|
return {"HasRichHeader": 0.0, "RichHeaderCount": 0.0}
|
|
|
|
return {
|
|
"HasRichHeader": 1.0,
|
|
"RichHeaderCount": float(len(pe.RICH_HEADER.values) // 2) if hasattr(pe.RICH_HEADER, 'values') else 0.0
|
|
}
|
|
|
|
def _extract_ep_anomalies(self, pe):
|
|
if not hasattr(pe, 'OPTIONAL_HEADER') or not hasattr(pe, 'sections') or not pe.sections:
|
|
return {"EntryPointSectionIndex": -1.0, "EntryPointInExecutable": 0.0, "EntryPointInLastSection": 0.0}
|
|
|
|
ep = pe.OPTIONAL_HEADER.AddressOfEntryPoint
|
|
ep_section_idx = -1
|
|
ep_in_exec = 0.0
|
|
|
|
for idx, sec in enumerate(pe.sections):
|
|
if sec.VirtualAddress <= ep < (sec.VirtualAddress + sec.Misc_VirtualSize):
|
|
ep_section_idx = idx
|
|
if sec.Characteristics & 0x20000000:
|
|
ep_in_exec = 1.0
|
|
break
|
|
|
|
return {
|
|
"EntryPointSectionIndex": float(ep_section_idx),
|
|
"EntryPointInExecutable": ep_in_exec,
|
|
"EntryPointInLastSection": 1.0 if ep_section_idx == len(pe.sections) - 1 else 0.0
|
|
}
|
|
|
|
def _extract_advanced_resources(self, pe, range_entropies=None):
|
|
res_data = {
|
|
"ResourceMaxEntropy": 0.0,
|
|
"ResourceMinEntropy": 0.0,
|
|
"ResourceMeanEntropy": 0.0,
|
|
"ResourceLangCount": 0.0,
|
|
"ResourceRCDataCount": 0.0
|
|
}
|
|
|
|
if not hasattr(pe, 'DIRECTORY_ENTRY_RESOURCE'):
|
|
return res_data
|
|
|
|
entropies = []
|
|
entropy_iter = iter(range_entropies or ())
|
|
langs = set()
|
|
rcdata_count = 0
|
|
|
|
for entry_type in pe.DIRECTORY_ENTRY_RESOURCE.entries:
|
|
if hasattr(entry_type, 'id') and entry_type.id == 10:
|
|
rcdata_count += len(getattr(entry_type.directory, 'entries', []))
|
|
|
|
if not hasattr(entry_type, 'directory'):
|
|
continue
|
|
|
|
for entry_id in entry_type.directory.entries:
|
|
if not hasattr(entry_id, 'directory'):
|
|
continue
|
|
|
|
for entry_lang in entry_id.directory.entries:
|
|
if hasattr(entry_lang, 'id'):
|
|
langs.add(entry_lang.id)
|
|
|
|
if hasattr(entry_lang, 'data'):
|
|
try:
|
|
entropies.append(float(next(entropy_iter)))
|
|
except (StopIteration, TypeError, ValueError):
|
|
entropies.append(0.0)
|
|
|
|
res_data["ResourceLangCount"] = float(len(langs))
|
|
res_data["ResourceRCDataCount"] = float(rcdata_count)
|
|
|
|
if entropies:
|
|
res_data["ResourceMaxEntropy"] = max(entropies)
|
|
res_data["ResourceMinEntropy"] = min(entropies)
|
|
res_data["ResourceMeanEntropy"] = sum(entropies) / len(entropies)
|
|
|
|
return res_data
|
|
|
|
def _extract_load_config(self, pe):
|
|
cfg = {"HasLoadConfig": 0.0, "HasCFG": 0.0, "HasSEHTable": 0.0}
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_LOAD_CONFIG'):
|
|
cfg["HasLoadConfig"] = 1.0
|
|
struct = pe.DIRECTORY_ENTRY_LOAD_CONFIG.struct
|
|
|
|
if getattr(struct, 'GuardCFFunctionTable', 0) != 0:
|
|
cfg["HasCFG"] = 1.0
|
|
|
|
if getattr(struct, 'SEHandlerTable', 0) != 0:
|
|
cfg["HasSEHTable"] = 1.0
|
|
|
|
return cfg
|
|
|
|
def _extract_security_directory(self, pe, file_path, fsize):
|
|
res = {"HasSignature": 0.0, "SignatureCount": 0.0}
|
|
if not hasattr(pe, 'OPTIONAL_HEADER') or not hasattr(pe.OPTIONAL_HEADER, 'DATA_DIRECTORY'):
|
|
return res
|
|
directories = pe.OPTIONAL_HEADER.DATA_DIRECTORY
|
|
if len(directories) <= 4:
|
|
return res
|
|
sec_dir = directories[4]
|
|
offset = int(sec_dir.VirtualAddress)
|
|
size = int(sec_dir.Size)
|
|
if offset <= 0 or size <= 0 or offset + size > fsize:
|
|
return res
|
|
|
|
res["HasSignature"] = 1.0
|
|
count = 0
|
|
curr = offset
|
|
end = offset + size
|
|
with open(file_path, "rb") as source:
|
|
while curr + 8 <= end:
|
|
source.seek(curr)
|
|
header = source.read(4)
|
|
if len(header) != 4:
|
|
break
|
|
length = int.from_bytes(header, 'little')
|
|
if length < 8 or curr + length > end:
|
|
break
|
|
count += 1
|
|
curr += (length + 7) & ~7
|
|
res["SignatureCount"] = float(count)
|
|
return res
|
|
|
|
def extract_features(self, file_path):
|
|
pe = None
|
|
|
|
try:
|
|
fsize = os.path.getsize(file_path)
|
|
if fsize == 0 or fsize > 4294967296:
|
|
return None
|
|
|
|
base = self._base_defaults()
|
|
dlls = set()
|
|
apis = set()
|
|
pe = pefile.PE(name=file_path, fast_load=True)
|
|
|
|
try:
|
|
pe.parse_rich_header()
|
|
pe.parse_data_directories(directories=[
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_IMPORT'],
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_EXPORT'],
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_RESOURCE'],
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_DEBUG'],
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_TLS'],
|
|
pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG']
|
|
])
|
|
except Exception:
|
|
pass
|
|
|
|
sections = list(getattr(pe, 'sections', []))
|
|
section_ranges = []
|
|
for section in sections:
|
|
start = max(0, int(section.get_PointerToRawData_adj()))
|
|
end = min(fsize, start + max(0, int(section.SizeOfRawData)))
|
|
section_ranges.append((start, max(start, end)))
|
|
resource_ranges = _collect_resource_ranges(pe, fsize)
|
|
overlay_offset = pe.get_overlay_data_start_offset()
|
|
if not overlay_offset or overlay_offset >= fsize:
|
|
overlay_offset = fsize
|
|
all_ranges = section_ranges + resource_ranges + [
|
|
(int(overlay_offset), fsize)
|
|
]
|
|
stream_features, range_entropies = _extract_stream_features(
|
|
file_path, fsize, all_ranges, self
|
|
)
|
|
section_entropies = range_entropies[:len(section_ranges)]
|
|
resource_start = len(section_ranges)
|
|
resource_entropies = range_entropies[
|
|
resource_start:resource_start + len(resource_ranges)
|
|
]
|
|
overlay_entropy = range_entropies[-1]
|
|
|
|
base['TrustSigned'] = 1.0 if self.signer.sign_verify(file_path) else 0.0
|
|
base['FileSize'] = float(fsize)
|
|
|
|
fh = pe.FILE_HEADER
|
|
base['Machine'] = getattr(fh, 'Machine', 0)
|
|
base['NumberOfSections'] = getattr(fh, 'NumberOfSections', 0)
|
|
base['TimeDateStamp'] = getattr(fh, 'TimeDateStamp', 0)
|
|
base['PointerToSymbolTable'] = getattr(fh, 'PointerToSymbolTable', 0)
|
|
base['NumberOfSymbols'] = getattr(fh, 'NumberOfSymbols', 0)
|
|
base['SizeOfOptionalHeader'] = getattr(fh, 'SizeOfOptionalHeader', 0)
|
|
base['Characteristics'] = getattr(fh, 'Characteristics', 0)
|
|
|
|
curr_ts = datetime.datetime.utcnow().timestamp()
|
|
base['HasInvalidTimestamp'] = 1.0 if (base['TimeDateStamp'] < 631152000 or base['TimeDateStamp'] > curr_ts + 2592000) else 0.0
|
|
base['FileTimeException'] = 1.0 if base['TimeDateStamp'] == 0 else 0.0
|
|
base['Is64Bit'] = 1.0 if base['Machine'] in (0x8664, 0xAA64, 0x0200) else 0.0
|
|
base['IsExe'] = 1.0 if pe.is_exe() else 0.0
|
|
base['IsDll'] = 1.0 if pe.is_dll() else 0.0
|
|
base['ExceptionCount'] = 0.0
|
|
|
|
if hasattr(pe, 'OPTIONAL_HEADER'):
|
|
op = pe.OPTIONAL_HEADER
|
|
fields = [
|
|
'Magic', 'MajorLinkerVersion', 'MinorLinkerVersion', 'SizeOfCode',
|
|
'SizeOfInitializedData', 'SizeOfUninitializedData', 'AddressOfEntryPoint',
|
|
'BaseOfCode', 'ImageBase', 'SectionAlignment', 'FileAlignment',
|
|
'MajorOperatingSystemVersion', 'MinorOperatingSystemVersion',
|
|
'MajorImageVersion', 'MinorImageVersion', 'MajorSubsystemVersion',
|
|
'MinorSubsystemVersion', 'SizeOfImage', 'SizeOfHeaders', 'CheckSum',
|
|
'Subsystem', 'DllCharacteristics', 'SizeOfStackReserve', 'SizeOfStackCommit',
|
|
'SizeOfHeapReserve', 'SizeOfHeapCommit', 'LoaderFlags', 'NumberOfRvaAndSizes'
|
|
]
|
|
for f_field in fields:
|
|
base[f_field] = getattr(op, f_field, 0)
|
|
|
|
base['IsDriver'] = 1.0 if base.get('Subsystem') == 1 else 0.0
|
|
|
|
if hasattr(op, 'DATA_DIRECTORY'):
|
|
for i, directory in enumerate(op.DATA_DIRECTORY):
|
|
base[f'DataDirectory_{i}_Size'] = directory.Size
|
|
base[f'DataDirectory_{i}_VA'] = directory.VirtualAddress
|
|
|
|
exc_idx = pefile.DIRECTORY_ENTRY.get('IMAGE_DIRECTORY_ENTRY_EXCEPTION', 3)
|
|
if len(op.DATA_DIRECTORY) > exc_idx and op.DATA_DIRECTORY[exc_idx].Size > 0:
|
|
base['ExceptionCount'] = op.DATA_DIRECTORY[exc_idx].Size // 12 if base['Machine'] in (0x8664, 0xAA64) else 0.0
|
|
|
|
res_flags_count = dict.fromkeys(self._CHAR_COUNT_KEYS.values(), 0.0)
|
|
res_flags_ent = dict.fromkeys(self._CHAR_ENT_KEYS.values(), 0.0)
|
|
res_sec_hash = dict.fromkeys(self._SECTION_HASH_KEYS, 0.0)
|
|
|
|
if hasattr(pe, 'sections'):
|
|
base['SectionCount'] = len(pe.sections)
|
|
entropies = []
|
|
raw_sizes = []
|
|
v_sizes = []
|
|
exec_sec = write_sec = read_sec = sec_exc = 0
|
|
|
|
for section_index, section in enumerate(pe.sections):
|
|
sec_name = section.Name.rstrip(b'\x00')
|
|
hash_val = zlib.crc32(sec_name) % 50
|
|
res_sec_hash[self._SECTION_HASH_KEYS[hash_val]] += 1.0
|
|
|
|
s_entropy = (
|
|
section_entropies[section_index]
|
|
if section_index < len(section_entropies) else 0.0
|
|
)
|
|
|
|
entropies.append(s_entropy)
|
|
raw_sizes.append(section.SizeOfRawData)
|
|
v_sizes.append(section.Misc_VirtualSize)
|
|
|
|
if section.Characteristics & 0x20000000:
|
|
exec_sec += 1
|
|
if section.Characteristics & 0x80000000:
|
|
write_sec += 1
|
|
if section.Characteristics & 0x40000000:
|
|
read_sec += 1
|
|
if section.SizeOfRawData + section.PointerToRawData > fsize:
|
|
sec_exc = 1
|
|
|
|
for flag in self._CHAR_FLAGS:
|
|
if section.Characteristics & flag:
|
|
res_flags_count[self._CHAR_COUNT_KEYS[flag]] += 1.0
|
|
res_flags_ent[self._CHAR_ENT_KEYS[flag]] += s_entropy
|
|
|
|
base['SectionMaxEntropy'] = max(entropies) if entropies else 0.0
|
|
base['SectionMinEntropy'] = min(entropies) if entropies else 0.0
|
|
base['SectionMeanEntropy'] = sum(entropies) / len(entropies) if entropies else 0.0
|
|
base['SectionMaxRawSize'] = max(raw_sizes) if raw_sizes else 0.0
|
|
base['SectionMinRawSize'] = min(raw_sizes) if raw_sizes else 0.0
|
|
base['SectionMeanRawSize'] = sum(raw_sizes) / len(raw_sizes) if raw_sizes else 0.0
|
|
base['SectionMaxVSize'] = max(v_sizes) if v_sizes else 0.0
|
|
base['SectionMinVSize'] = min(v_sizes) if v_sizes else 0.0
|
|
base['SectionMeanVSize'] = sum(v_sizes) / len(v_sizes) if v_sizes else 0.0
|
|
base['ExecutableSections'] = float(exec_sec)
|
|
base['WritableSections'] = float(write_sec)
|
|
base['ReadableSections'] = float(read_sec)
|
|
base['SectionException'] = float(sec_exc)
|
|
|
|
for flag in self._CHAR_FLAGS:
|
|
cnt_key = self._CHAR_COUNT_KEYS[flag]
|
|
if res_flags_count[cnt_key] > 0:
|
|
res_flags_ent[self._CHAR_ENT_KEYS[flag]] /= res_flags_count[cnt_key]
|
|
|
|
base.update(res_flags_count)
|
|
base.update(res_flags_ent)
|
|
base.update(res_sec_hash)
|
|
|
|
string_keys = ['FileDescription', 'FileVersion', 'ProductName', 'ProductVersion', 'CompanyName', 'LegalCopyright', 'Comments', 'InternalName', 'LegalTrademarks', 'SpecialBuild', 'PrivateBuild']
|
|
for key in string_keys:
|
|
base[f'{key}Length'] = 0.0
|
|
|
|
if hasattr(pe, 'FileInfo'):
|
|
for fileinfo_list in pe.FileInfo:
|
|
for fileinfo in fileinfo_list:
|
|
|
|
if getattr(fileinfo, 'name', '') in ('StringFileInfo', b'StringFileInfo'):
|
|
for st in getattr(fileinfo, 'StringTable', []):
|
|
for key, val in st.entries.items():
|
|
try:
|
|
k = key.decode('utf-8', 'ignore') if isinstance(key, bytes) else str(key)
|
|
if k in string_keys:
|
|
v = val.decode('utf-8', 'ignore') if isinstance(val, bytes) else str(val)
|
|
base[f'{k}Length'] = float(len(v))
|
|
|
|
except Exception:
|
|
continue
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_TLS') and hasattr(pe.DIRECTORY_ENTRY_TLS, 'struct'):
|
|
if getattr(pe.DIRECTORY_ENTRY_TLS.struct, 'AddressOfCallBacks', 0) != 0:
|
|
base['HasTlsCallbacks'] = 1.0
|
|
|
|
if hasattr(pe, 'VS_FIXEDFILEINFO') and len(pe.VS_FIXEDFILEINFO) > 0:
|
|
flags = getattr(pe.VS_FIXEDFILEINFO[0], 'FileFlags', 0)
|
|
base['IsDebug'] = 1.0 if flags & 0x1 else 0.0
|
|
base['IsPreRelease'] = 1.0 if flags & 0x2 else 0.0
|
|
base['IsPatched'] = 1.0 if flags & 0x4 else 0.0
|
|
base['IsPrivateBuild'] = 1.0 if flags & 0x8 else 0.0
|
|
base['IsSpecialBuild'] = 1.0 if flags & 0x20 else 0.0
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_IMPORT'):
|
|
base['ImportCount'] = float(len(pe.DIRECTORY_ENTRY_IMPORT))
|
|
func_count = 0
|
|
|
|
for entry in pe.DIRECTORY_ENTRY_IMPORT:
|
|
if getattr(entry, 'dll', None):
|
|
try:
|
|
dlls.add(entry.dll.decode('ascii', 'ignore').lower())
|
|
except Exception:
|
|
pass
|
|
|
|
for imp in getattr(entry, 'imports', []):
|
|
func_count += 1
|
|
if getattr(imp, 'name', None):
|
|
try:
|
|
apis.add(imp.name.decode('ascii', 'ignore'))
|
|
except Exception:
|
|
pass
|
|
|
|
base['ImportFunctionCount'] = float(func_count)
|
|
else:
|
|
base['ImportCount'] = 0.0
|
|
base['ImportFunctionCount'] = 0.0
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_EXPORT') and hasattr(pe.DIRECTORY_ENTRY_EXPORT, 'symbols'):
|
|
base['ExportCount'] = float(len(pe.DIRECTORY_ENTRY_EXPORT.symbols))
|
|
else:
|
|
base['ExportCount'] = 0.0
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_RESOURCE'):
|
|
icon_count = 0
|
|
for entry in pe.DIRECTORY_ENTRY_RESOURCE.entries:
|
|
if getattr(entry, 'id', None) == 3 and hasattr(entry, 'directory'):
|
|
icon_count += len(getattr(entry.directory, 'entries', []))
|
|
|
|
base['IconCount'] = float(icon_count)
|
|
else:
|
|
base['IconCount'] = 0.0
|
|
|
|
if hasattr(pe, 'DIRECTORY_ENTRY_DEBUG'):
|
|
base['DebugCount'] = float(len(pe.DIRECTORY_ENTRY_DEBUG))
|
|
else:
|
|
base['DebugCount'] = 0.0
|
|
|
|
base.update(stream_features)
|
|
overlay_size = fsize - int(overlay_offset)
|
|
base.update({
|
|
"HasOverlay": 1.0 if overlay_size else 0.0,
|
|
"OverlaySize": float(overlay_size),
|
|
"OverlayRatio": float(overlay_size) / float(fsize) if overlay_size else 0.0,
|
|
"OverlayEntropy": overlay_entropy if overlay_size else 0.0
|
|
})
|
|
base.update(self._extract_rich_header(pe))
|
|
base.update(self._extract_ep_anomalies(pe))
|
|
base.update(self._extract_advanced_resources(pe, resource_entropies))
|
|
base.update(self._extract_load_config(pe))
|
|
base.update(self._extract_security_directory(pe, file_path, fsize))
|
|
|
|
for k in base:
|
|
base[k] = self._safe_float(base[k])
|
|
|
|
return {"Base": base, "DLLs": list(dlls), "APIs": list(apis)}
|
|
|
|
except Exception:
|
|
return None
|
|
finally:
|
|
if pe:
|
|
pe.close()
|
|
|
|
####################################################################################################
|
|
|
|
def pe_scan(self, file_path, enhanced_mode=False):
|
|
if not self.model or not self.feature_order:
|
|
return False, False
|
|
|
|
try:
|
|
raw_data = self.extract_features(file_path)
|
|
if not raw_data:
|
|
return False, False
|
|
|
|
vec = numpy.zeros((1, len(self.feature_order)), dtype=numpy.float32)
|
|
base = raw_data.get('Base', {})
|
|
dlls = set(raw_data.get('DLLs', []))
|
|
apis = set(raw_data.get('APIs', []))
|
|
feat_map = {feat: i for i, feat in enumerate(self.feature_order)}
|
|
|
|
for k, v in base.items():
|
|
if k in feat_map:
|
|
vec[0, feat_map[k]] = v
|
|
|
|
for d in dlls:
|
|
old_fn = f"Dll_{d}"
|
|
if old_fn in feat_map:
|
|
vec[0, feat_map[old_fn]] = 1.0
|
|
|
|
h = zlib.crc32(d.encode('utf-8', 'ignore')) % self.dll_hash_dim
|
|
new_fn = f"DllHash_{h:0{self.dll_hash_pad}d}"
|
|
if new_fn in feat_map:
|
|
vec[0, feat_map[new_fn]] += 1.0
|
|
|
|
for a in apis:
|
|
old_fn = f"Api_{a}"
|
|
if old_fn in feat_map:
|
|
vec[0, feat_map[old_fn]] = 1.0
|
|
|
|
h = zlib.crc32(a.encode('utf-8', 'ignore')) % self.api_hash_dim
|
|
new_fn = f"ApiHash_{h:0{self.api_hash_pad}d}"
|
|
if new_fn in feat_map:
|
|
vec[0, feat_map[new_fn]] += 1.0
|
|
|
|
outputs = self.model.run(None, {self.input_name: vec})
|
|
|
|
del raw_data, vec
|
|
result = outputs[1]
|
|
prob = 0.0
|
|
|
|
if isinstance(result, list) and len(result) > 0:
|
|
prob_dict = result[0]
|
|
if hasattr(prob_dict, 'get'):
|
|
prob = float(prob_dict.get(1, prob_dict.get('1', 0.0)))
|
|
|
|
elif isinstance(result, numpy.ndarray):
|
|
if result.ndim == 2 and result.shape[1] > 1:
|
|
prob = float(result[0][1])
|
|
|
|
score = int(prob * 100)
|
|
if score >= 80:
|
|
return f"Malware:WinPE/General.{score}!ml", score
|
|
elif enhanced_mode and score >= 50:
|
|
return f"Suspicious:WinPE/General.{score}!ml", score
|
|
|
|
return False, False
|
|
except Exception:
|
|
return False, False
|
|
|
|
####################################################################################################
|
|
|
|
class cloud_scanner:
|
|
def __init__(self):
|
|
self.api_host = None
|
|
self.api_key = None
|
|
self.timeout = 30
|
|
self.lock = threading.RLock()
|
|
self.local = threading.local()
|
|
|
|
def _get_session(self, api_host, api_key):
|
|
if not hasattr(self.local, 'session') or getattr(self.local, 'host', None) != api_host:
|
|
self.local.session = requests.Session()
|
|
self.local.session.headers.update({"X-API-Key": api_key, "User-Agent": "PYAS-Engine/1.1"})
|
|
self.local.host = api_host
|
|
|
|
return self.local.session
|
|
|
|
def _request(self, method, endpoint, api_host, api_key, **kwargs):
|
|
session = self._get_session(api_host, api_key)
|
|
try:
|
|
r = session.request(method, f"{api_host}{endpoint}", timeout=self.timeout, **kwargs)
|
|
if r.status_code == 200:
|
|
return r
|
|
|
|
except Exception:
|
|
pass
|
|
return None
|
|
|
|
####################################################################################################
|
|
|
|
def rescan(self, sha256, api_host, api_key):
|
|
r = self._request("POST", f"/api/rescan/{sha256}", api_host, api_key)
|
|
return r is not None and r.json().get('status') == 'success'
|
|
|
|
def upload_file(self, file_path, api_host, api_key, chunk_size=4194304, need_rescan=False, max_retries=3, file_hash=None):
|
|
try:
|
|
sha256 = file_hash
|
|
if not sha256:
|
|
return False, None
|
|
|
|
status_req = self._request("GET", f"/api/processing_status/{sha256}", api_host, api_key)
|
|
if status_req:
|
|
current_status = status_req.json().get('status')
|
|
|
|
if current_status == 'done':
|
|
if need_rescan:
|
|
self.rescan(sha256, api_host, api_key)
|
|
return True, sha256
|
|
|
|
elif current_status in ('queued', 'processing'):
|
|
return True, sha256
|
|
|
|
file_size = os.path.getsize(file_path)
|
|
if file_size > 104857600:
|
|
return False, sha256
|
|
|
|
total_chunks = max(1, (file_size + chunk_size - 1) // chunk_size)
|
|
upload_id = os.urandom(16).hex()
|
|
|
|
with open(file_path, 'rb') as f:
|
|
for i in range(total_chunks):
|
|
chunk_data = f.read(chunk_size)
|
|
headers = {"X-Chunk-Index": str(i), "X-Total-Chunks": str(total_chunks), "X-Upload-ID": upload_id}
|
|
|
|
chunk_success = False
|
|
for attempt in range(max_retries):
|
|
r = self._request("POST", "/api/upload", api_host, api_key, files={'file': (os.path.basename(file_path), chunk_data)}, headers=headers)
|
|
if r:
|
|
if i == total_chunks - 1:
|
|
try:
|
|
resp = r.json()
|
|
if 'url' in resp:
|
|
sha256 = resp.get('url', '').split('/')[-1]
|
|
except Exception:
|
|
pass
|
|
|
|
chunk_success = True
|
|
break
|
|
time.sleep(2 ** attempt)
|
|
|
|
if not chunk_success:
|
|
return False, sha256
|
|
|
|
return True, sha256
|
|
except Exception:
|
|
return False, None
|
|
|
|
####################################################################################################
|
|
|
|
def get_result(self, sha256, api_host, api_key, max_retries=6, interval=10):
|
|
try:
|
|
if not sha256:
|
|
return False
|
|
|
|
is_done = False
|
|
for _ in range(max_retries):
|
|
r = self._request("GET", f"/api/processing_status/{sha256}", api_host, api_key)
|
|
if r:
|
|
st = r.json().get('status', 'error')
|
|
if st == 'done':
|
|
is_done = True
|
|
break
|
|
|
|
if st in ['error', 'failed']:
|
|
return False
|
|
|
|
time.sleep(interval)
|
|
|
|
if not is_done:
|
|
return False
|
|
|
|
r = self._request("GET", f"/api/report/{sha256}", api_host, api_key)
|
|
if r:
|
|
data = r.json().get('data', {})
|
|
metadata = data.get('metadata', {})
|
|
label = metadata.get('label', 'Unsupport')
|
|
score = metadata.get('score', 0)
|
|
sims = data.get('similar', [])
|
|
|
|
is_malicious = 'General' in label
|
|
sim_malicious_count = 0
|
|
valid_sim_count = 0
|
|
|
|
for s in sims:
|
|
if s.get('similarity', 0) > 80:
|
|
valid_sim_count += 1
|
|
if "General" in s.get('label', ''):
|
|
sim_malicious_count += 1
|
|
|
|
if is_malicious and (valid_sim_count == 0 or sim_malicious_count == valid_sim_count):
|
|
return f"Malware:WinPE/General.{score}!cl"
|
|
|
|
except Exception:
|
|
pass
|
|
return False
|