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ProtectProcess.cpp

@@ -0,0 +1,86 @@
+#include "DriverCommon.h"
+
+PVOID ObRegistrationHandle = NULL;
+OB_CALLBACK_REGISTRATION ObRegistration;
+OB_OPERATION_REGISTRATION ObCallbacks[1];
+
+static BOOLEAN IsSystemImage(PUNICODE_STRING FullImageName) {
+    if (!FullImageName || !FullImageName->Buffer) return FALSE;
+
+    if (WildcardMatch(L"*\\Windows\\System32\\*", FullImageName->Buffer, FullImageName->Length) ||
+        WildcardMatch(L"*\\Windows\\SysWOW64\\*", FullImageName->Buffer, FullImageName->Length) ||
+        WildcardMatch(L"*\\Windows\\WinSxS\\*", FullImageName->Buffer, FullImageName->Length)) {
+        return TRUE;
+    }
+    return FALSE;
+}
+
+VOID ImageLoadNotify(PUNICODE_STRING FullImageName, HANDLE ProcessId, PIMAGE_INFO ImageInfo) {
+    UNREFERENCED_PARAMETER(ImageInfo);
+
+    if (KeGetCurrentIrql() > APC_LEVEL) return;
+    if (!FullImageName || !FullImageName->Buffer) return;
+    if (ProcessId == (HANDLE)0) return;
+
+    if (IsSystemImage(FullImageName)) return;
+
+    if (IsTargetProtected(ProcessId)) {
+        if (CheckFileExtensionRule(FullImageName)) {
+            SendMessageToUser(6001, (ULONG)(ULONG_PTR)ProcessId, FullImageName->Buffer, FullImageName->Length);
+        }
+    }
+}
+
+static OB_PREOP_CALLBACK_STATUS PreOpenProcess(PVOID RegistrationContext, POB_PRE_OPERATION_INFORMATION OperationInformation) {
+    UNREFERENCED_PARAMETER(RegistrationContext);
+
+    if (OperationInformation->KernelHandle) return OB_PREOP_SUCCESS;
+
+    PEPROCESS TargetProcess = (PEPROCESS)OperationInformation->Object;
+    if (!TargetProcess) return OB_PREOP_SUCCESS;
+
+    HANDLE TargetPid = PsGetProcessId(TargetProcess);
+    HANDLE SourcePid = PsGetCurrentProcessId();
+
+    if (SourcePid == TargetPid) return OB_PREOP_SUCCESS;
+    if (IsProcessTrusted(SourcePid)) return OB_PREOP_SUCCESS;
+
+    // Low frequency path, acceptable to check installer here
+    if (IsInstallerProcess(SourcePid)) return OB_PREOP_SUCCESS;
+
+    BOOLEAN bProtected = IsTargetProtected(TargetPid);
+
+    if (bProtected) {
+        ACCESS_MASK DenyMask = PROCESS_TERMINATE | PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_CREATE_THREAD | PROCESS_VM_READ | PROCESS_DUP_HANDLE;
+
+        OperationInformation->Parameters->CreateHandleInformation.DesiredAccess &= ~DenyMask;
+        OperationInformation->Parameters->CreateHandleInformation.OriginalDesiredAccess &= ~DenyMask;
+    }
+
+    return OB_PREOP_SUCCESS;
+}
+
+NTSTATUS InitializeProcessProtection() {
+    static UNICODE_STRING Altitude = { 0 };
+    RtlInitUnicodeString(&Altitude, L"320000");
+
+    ObCallbacks[0].ObjectType = PsProcessType;
+    ObCallbacks[0].Operations = OB_OPERATION_HANDLE_CREATE | OB_OPERATION_HANDLE_DUPLICATE;
+    ObCallbacks[0].PreOperation = PreOpenProcess;
+    ObCallbacks[0].PostOperation = NULL;
+
+    ObRegistration.Version = OB_FLT_REGISTRATION_VERSION;
+    ObRegistration.OperationRegistrationCount = 1;
+    ObRegistration.Altitude = Altitude;
+    ObRegistration.RegistrationContext = NULL;
+    ObRegistration.OperationRegistration = ObCallbacks;
+
+    return ObRegisterCallbacks(&ObRegistration, &ObRegistrationHandle);
+}
+
+VOID UninitializeProcessProtection() {
+    if (ObRegistrationHandle) {
+        ObUnRegisterCallbacks(ObRegistrationHandle);
+        ObRegistrationHandle = NULL;
+    }
+}