无痕HOOK方式=硬断+VEH
BOOL APIENTRY DllMain( HMODULE hModule,
DWORDul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
AddVectoredExceptionHandler(1, (PVECTORED_EXCEPTION_HANDLER)ExceptionHandler);
SetHwBreakpoint();
}
case DLL_THREAD_ATTACH:
{
SetHwBreakpoint();
}
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
void SetHwBreakpoint()
{
CONTEXT ctx;
ctx.ContextFlags = CONTEXT_ALL;
GetThreadContext(GetCurrentThread(), &ctx);
ctx.Dr0 = 0x6f3a20dd;
ctx.Dr1 = 0x6f361f7b;
ctx.Dr7 = 0x405;
SetThreadContext(GetCurrentThread(), &ctx);
}
DWORD NTAPI ExceptionHandler(EXCEPTION_POINTERS * ExceptionInfo)
{
if ((DWORD)ExceptionInfo->ExceptionRecord->ExceptionAddress == 0x6f3a20dd)
{
//直接改eip模拟jmp
ExceptionInfo->ContextRecord->Eip += 0x34;
return EXCEPTION_CONTINUE_EXECUTION;
}
else if ((DWORD)ExceptionInfo->ExceptionRecord->ExceptionAddress == 0x6f361f7b)
{
//直接设eax为零模拟mov eax,0
ExceptionInfo->ContextRecord->Eax = 0;
ExceptionInfo->ContextRecord->Eip += 5;
return EXCEPTION_CONTINUE_EXECUTION;
}
else
{
//在异常handler里重设drx防止断点被意外清除
ExceptionInfo->ContextRecord->Dr0 = 0x6f3a20dd;
ExceptionInfo->ContextRecord->Dr1 = 0x6f361f7b;
ExceptionInfo->ContextRecord->Dr7 = 0x405;
return EXCEPTION_CONTINUE_SEARCH;
}
}
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