622 lines
26 KiB
Python
622 lines
26 KiB
Python
import os, re, yara, time, math, json, numpy, base64, datetime, requests
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import ctypes, ctypes.wintypes, hashlib, pefile, threading, onnxruntime
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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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label = rule_name.split("_")[0]
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level = rule_name.split("_")[-1]
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return f"{label}:WinPE/Unknown.A!rb", level
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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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class pe_scanner:
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def __init__(self):
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self.model = None
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self.input_name = None
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self.feature_order = []
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self.signer = sign_scanner()
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self.signer.init_windll(["wintrust"])
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def load_path(self, path, callback=None):
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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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if full_path.endswith('.onnx'):
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self.load_model(full_path)
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def load_model(self, model_path):
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if not os.path.exists(model_path):
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return
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try:
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self.model = onnxruntime.InferenceSession(model_path, providers=['CPUExecutionProvider'])
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self.input_name = self.model.get_inputs()[0].name
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feat_path = os.path.join(os.path.dirname(model_path), "features.json")
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if os.path.exists(feat_path):
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with open(feat_path, 'r', encoding='utf-8') as f:
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self.feature_order = json.load(f)
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except Exception:
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pass
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def _safe_float(self, val):
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try:
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f = float(val)
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if math.isinf(f) or math.isnan(f):
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return 0.0
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return f
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except Exception:
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return 0.0
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def _calc_entropy(self, data):
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if not data:
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return 0.0
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arr = numpy.frombuffer(data, dtype=numpy.uint8)
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counts = numpy.bincount(arr, minlength=256)
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probs = counts[counts > 0] / len(arr)
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return float(-numpy.sum(probs * numpy.log2(probs)))
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def extract_features(self, file_path):
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pe = None
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try:
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fsize = os.path.getsize(file_path)
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if fsize == 0 or fsize > 536870912:
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return None
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with open(file_path, "rb") as f:
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file_bytes = f.read()
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base = {}
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dlls = set()
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apis = set()
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pe = pefile.PE(data=file_bytes, fast_load=True)
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base['TrustSigned'] = 1.0 if self.signer.sign_verify(file_path) else 0.0
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base['FileEntropy'] = self._calc_entropy(file_bytes)
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base['FileSize'] = float(fsize)
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fh = pe.FILE_HEADER
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base['Machine'] = getattr(fh, 'Machine', 0)
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base['NumberOfSections'] = getattr(fh, 'NumberOfSections', 0)
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base['TimeDateStamp'] = getattr(fh, 'TimeDateStamp', 0)
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base['PointerToSymbolTable'] = getattr(fh, 'PointerToSymbolTable', 0)
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base['NumberOfSymbols'] = getattr(fh, 'NumberOfSymbols', 0)
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base['SizeOfOptionalHeader'] = getattr(fh, 'SizeOfOptionalHeader', 0)
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base['Characteristics'] = getattr(fh, 'Characteristics', 0)
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curr_ts = datetime.datetime.utcnow().timestamp()
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base['HasInvalidTimestamp'] = 1.0 if (base['TimeDateStamp'] < 631152000 or base['TimeDateStamp'] > curr_ts + 2592000) else 0.0
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base['FileTimeException'] = 1.0 if base['TimeDateStamp'] == 0 else 0.0
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base['Is64Bit'] = 1.0 if base['Machine'] in (0x8664, 0xAA64, 0x0200) else 0.0
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base['IsExe'] = 1.0 if pe.is_exe() else 0.0
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base['IsDll'] = 1.0 if pe.is_dll() else 0.0
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base['ExceptionCount'] = 0.0
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if hasattr(pe, 'OPTIONAL_HEADER'):
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op = pe.OPTIONAL_HEADER
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fields = [
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'Magic', 'MajorLinkerVersion', 'MinorLinkerVersion', 'SizeOfCode',
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'SizeOfInitializedData', 'SizeOfUninitializedData', 'AddressOfEntryPoint',
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'BaseOfCode', 'ImageBase', 'SectionAlignment', 'FileAlignment',
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'MajorOperatingSystemVersion', 'MinorOperatingSystemVersion',
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'MajorImageVersion', 'MinorImageVersion', 'MajorSubsystemVersion',
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'MinorSubsystemVersion', 'SizeOfImage', 'SizeOfHeaders', 'CheckSum',
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'Subsystem', 'DllCharacteristics', 'SizeOfStackReserve', 'SizeOfStackCommit',
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'SizeOfHeapReserve', 'SizeOfHeapCommit', 'LoaderFlags', 'NumberOfRvaAndSizes'
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]
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for f_field in fields:
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base[f_field] = getattr(op, f_field, 0)
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base['IsDriver'] = 1.0 if base.get('Subsystem') == 1 else 0.0
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if hasattr(op, 'DATA_DIRECTORY'):
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for i, directory in enumerate(op.DATA_DIRECTORY):
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base[f'DataDirectory_{i}_Size'] = directory.Size
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base[f'DataDirectory_{i}_VA'] = directory.VirtualAddress
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exc_idx = pefile.DIRECTORY_ENTRY.get('IMAGE_DIRECTORY_ENTRY_EXCEPTION', 3)
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if len(op.DATA_DIRECTORY) > exc_idx and op.DATA_DIRECTORY[exc_idx].Size > 0:
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base['ExceptionCount'] = op.DATA_DIRECTORY[exc_idx].Size // 12 if base['Machine'] in (0x8664, 0xAA64) else 0.0
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char_flags = [0x00000020, 0x00000040, 0x00000080, 0x02000000, 0x20000000, 0x40000000, 0x80000000]
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for flag in char_flags:
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base[f'Char_{flag:08X}_Count'] = 0.0
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base[f'Char_{flag:08X}_MeanEntropy'] = 0.0
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if hasattr(pe, 'sections'):
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base['SectionCount'] = len(pe.sections)
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entropies = []
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raw_sizes = []
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v_sizes = []
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exec_sec = 0
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write_sec = 0
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read_sec = 0
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sec_exc = 0
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for section in pe.sections:
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try:
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s_data = section.get_data()
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s_entropy = self._calc_entropy(s_data)
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except Exception:
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s_entropy = 0.0
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entropies.append(s_entropy)
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raw_sizes.append(section.SizeOfRawData)
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v_sizes.append(section.Misc_VirtualSize)
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if section.Characteristics & 0x20000000: exec_sec += 1
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if section.Characteristics & 0x80000000: write_sec += 1
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if section.Characteristics & 0x40000000: read_sec += 1
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if section.SizeOfRawData + section.PointerToRawData > fsize: sec_exc = 1
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for flag in char_flags:
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if section.Characteristics & flag:
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base[f'Char_{flag:08X}_Count'] += 1.0
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base[f'Char_{flag:08X}_MeanEntropy'] += s_entropy
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base['SectionMaxEntropy'] = max(entropies) if entropies else 0.0
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base['SectionMinEntropy'] = min(entropies) if entropies else 0.0
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base['SectionMeanEntropy'] = sum(entropies) / len(entropies) if entropies else 0.0
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base['SectionMaxRawSize'] = max(raw_sizes) if raw_sizes else 0.0
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base['SectionMinRawSize'] = min(raw_sizes) if raw_sizes else 0.0
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base['SectionMeanRawSize'] = sum(raw_sizes) / len(raw_sizes) if raw_sizes else 0.0
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base['SectionMaxVSize'] = max(v_sizes) if v_sizes else 0.0
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base['SectionMinVSize'] = min(v_sizes) if v_sizes else 0.0
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base['SectionMeanVSize'] = sum(v_sizes) / len(v_sizes) if v_sizes else 0.0
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base['ExecutableSections'] = float(exec_sec)
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base['WritableSections'] = float(write_sec)
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base['ReadableSections'] = float(read_sec)
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base['SectionException'] = float(sec_exc)
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for flag in char_flags:
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if base[f'Char_{flag:08X}_Count'] > 0:
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base[f'Char_{flag:08X}_MeanEntropy'] = base[f'Char_{flag:08X}_MeanEntropy'] / base[f'Char_{flag:08X}_Count']
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string_keys = ['FileDescription', 'FileVersion', 'ProductName', 'ProductVersion', 'CompanyName', 'LegalCopyright', 'Comments', 'InternalName', 'LegalTrademarks', 'SpecialBuild', 'PrivateBuild']
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for key in string_keys:
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base[f'{key}Length'] = 0.0
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if hasattr(pe, 'FileInfo'):
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for fileinfo_list in pe.FileInfo:
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for fileinfo in fileinfo_list:
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if getattr(fileinfo, 'name', '') in ('StringFileInfo', b'StringFileInfo'):
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for st in getattr(fileinfo, 'StringTable', []):
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for key, val in st.entries.items():
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try:
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k = key.decode('utf-8', 'ignore') if isinstance(key, bytes) else str(key)
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if k in string_keys:
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v = val.decode('utf-8', 'ignore') if isinstance(val, bytes) else str(val)
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base[f'{k}Length'] = float(len(v))
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except Exception:
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continue
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try:
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pe.parse_data_directories(directories=[
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pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_IMPORT'],
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pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_EXPORT'],
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pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_RESOURCE'],
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pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_DEBUG'],
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pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_TLS']
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])
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except Exception:
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pass
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if hasattr(pe, 'DIRECTORY_ENTRY_TLS') and hasattr(pe.DIRECTORY_ENTRY_TLS, 'struct'):
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if getattr(pe.DIRECTORY_ENTRY_TLS.struct, 'AddressOfCallBacks', 0) != 0:
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base['HasTlsCallbacks'] = 1.0
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if hasattr(pe, 'VS_FIXEDFILEINFO') and len(pe.VS_FIXEDFILEINFO) > 0:
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flags = getattr(pe.VS_FIXEDFILEINFO[0], 'FileFlags', 0)
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base['IsDebug'] = 1.0 if flags & 0x1 else 0.0
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base['IsPreRelease'] = 1.0 if flags & 0x2 else 0.0
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base['IsPatched'] = 1.0 if flags & 0x4 else 0.0
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base['IsPrivateBuild'] = 1.0 if flags & 0x8 else 0.0
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base['IsSpecialBuild'] = 1.0 if flags & 0x20 else 0.0
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if hasattr(pe, 'DIRECTORY_ENTRY_IMPORT'):
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base['ImportCount'] = float(len(pe.DIRECTORY_ENTRY_IMPORT))
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func_count = 0
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for entry in pe.DIRECTORY_ENTRY_IMPORT:
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if getattr(entry, 'dll', None):
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try:
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dlls.add(entry.dll.decode('ascii', 'ignore').lower())
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except Exception:
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pass
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for imp in getattr(entry, 'imports', []):
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func_count += 1
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if getattr(imp, 'name', None):
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try:
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apis.add(imp.name.decode('ascii', 'ignore'))
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except Exception:
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pass
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base['ImportFunctionCount'] = float(func_count)
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else:
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base['ImportCount'] = 0.0
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base['ImportFunctionCount'] = 0.0
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if hasattr(pe, 'DIRECTORY_ENTRY_EXPORT') and hasattr(pe.DIRECTORY_ENTRY_EXPORT, 'symbols'):
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base['ExportCount'] = float(len(pe.DIRECTORY_ENTRY_EXPORT.symbols))
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else:
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base['ExportCount'] = 0.0
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if hasattr(pe, 'DIRECTORY_ENTRY_RESOURCE'):
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icon_count = 0
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for entry in pe.DIRECTORY_ENTRY_RESOURCE.entries:
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if getattr(entry, 'id', None) == 3 and hasattr(entry, 'directory'):
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icon_count += len(getattr(entry.directory, 'entries', []))
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base['IconCount'] = float(icon_count)
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else:
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base['IconCount'] = 0.0
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if hasattr(pe, 'DIRECTORY_ENTRY_DEBUG'):
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base['DebugCount'] = float(len(pe.DIRECTORY_ENTRY_DEBUG))
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else:
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base['DebugCount'] = 0.0
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for k in base:
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base[k] = self._safe_float(base[k])
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return {"Base": base, "DLLs": list(dlls), "APIs": list(apis)}
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except Exception:
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return None
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finally:
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if pe:
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pe.close()
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def pe_scan(self, file_path, enhanced_mode=False):
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if not self.model or not self.feature_order:
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return False, False
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try:
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raw_data = self.extract_features(file_path)
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if not raw_data:
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return False, False
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vec = numpy.zeros((1, len(self.feature_order)), dtype=numpy.float32)
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base = raw_data.get('Base', {})
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dlls = set(raw_data.get('DLLs', []))
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apis = set(raw_data.get('APIs', []))
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for i, feat in enumerate(self.feature_order):
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if feat.startswith('Dll_'):
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if feat[4:] in dlls:
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vec[0, i] = 1.0
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elif feat.startswith('Api_'):
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if feat[4:] in apis:
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vec[0, i] = 1.0
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else:
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vec[0, i] = base.get(feat, 0.0)
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outputs = self.model.run(None, {self.input_name: vec})
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result = outputs[1]
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prob = 0.0
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if isinstance(result, list) and len(result) > 0:
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prob_dict = result[0]
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if hasattr(prob_dict, 'get'):
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prob = float(prob_dict.get(1, prob_dict.get('1', 0.0)))
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|
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"General:WinPE/Malware.{score}!ml", score
|
|
elif enhanced_mode and score >= 50:
|
|
return f"General:WinPE/Suspicious.{score}!ml", score
|
|
|
|
return False, False
|
|
except Exception:
|
|
return False, False
|
|
|
|
####################################################################################################
|
|
|
|
class cloud_scanner:
|
|
def __init__(self):
|
|
self.session = None
|
|
self.api_host = None
|
|
self.api_key = None
|
|
self.timeout = 30
|
|
self.lock = threading.RLock()
|
|
|
|
def _init_session(self, api_host, api_key):
|
|
with self.lock:
|
|
if self.session is None or self.api_host != api_host or self.api_key != api_key:
|
|
self.api_host = api_host.rstrip('/')
|
|
self.api_key = api_key
|
|
self.session = requests.Session()
|
|
self.session.headers.update({"X-API-Key": api_key, "User-Agent": "PYAS-Engine/1.1"})
|
|
|
|
def _request(self, method, endpoint, **kwargs):
|
|
with self.lock:
|
|
current_session = self.session
|
|
current_host = self.api_host
|
|
|
|
if not current_session:
|
|
return None
|
|
|
|
try:
|
|
r = current_session.request(method, f"{current_host}{endpoint}", timeout=self.timeout, **kwargs)
|
|
if r.status_code == 200:
|
|
return r
|
|
except Exception:
|
|
pass
|
|
return None
|
|
|
|
def calc_hash(self, file_path, block_size=65536):
|
|
try:
|
|
h = hashlib.sha256()
|
|
with open(file_path, "rb") as f:
|
|
for chunk in iter(lambda: f.read(block_size), b""):
|
|
h.update(chunk)
|
|
return h.hexdigest()
|
|
except Exception:
|
|
return ""
|
|
|
|
####################################################################################################
|
|
|
|
def rescan(self, sha256, api_host, api_key):
|
|
self._init_session(api_host, api_key)
|
|
r = self._request("POST", f"/api/rescan/{sha256}")
|
|
return r is not None and r.json().get('status') == 'success'
|
|
|
|
def upload_file(self, file_path, api_host, api_key, chunk_size=5242880, need_rescan=False):
|
|
try:
|
|
self._init_session(api_host, api_key)
|
|
sha256 = self.calc_hash(file_path)
|
|
if not sha256:
|
|
return False, None
|
|
|
|
status_req = self._request("GET", f"/api/processing_status/{sha256}")
|
|
if status_req:
|
|
status_data = status_req.json()
|
|
current_status = status_data.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
|
|
|
|
if file_size > chunk_size:
|
|
total_chunks = (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 _ in range(3):
|
|
r = self._request("POST", "/api/upload", files={'file': (os.path.basename(file_path), chunk_data)}, headers=headers)
|
|
if r:
|
|
chunk_success = True
|
|
break
|
|
time.sleep(1)
|
|
|
|
if not chunk_success:
|
|
return False, sha256
|
|
return True, sha256
|
|
|
|
with open(file_path, 'rb') as f:
|
|
file_data = f.read()
|
|
|
|
for _ in range(3):
|
|
r = self._request("POST", "/api/upload", files={'file': (os.path.basename(file_path), file_data)})
|
|
if r:
|
|
return True, sha256
|
|
time.sleep(1)
|
|
|
|
return False, 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
|
|
self._init_session(api_host, api_key)
|
|
|
|
is_done = False
|
|
for _ in range(max_retries):
|
|
r = self._request("GET", f"/api/processing_status/{sha256}")
|
|
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}")
|
|
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"General:WinPE/Unknown.{score}!cl"
|
|
except Exception:
|
|
pass
|
|
return False
|