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iat_hook.c
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iat_hook.c
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// dllmain.cpp : 定义 DLL 应用程序的入口点。
#include "pch.h"
#include <tchar.h>
BOOL hook_iat(LPCSTR szDllName, LPTHREAD_START_ROUTINE pfnOrg, PROC pfnNew);
int _stdcall mymsgbox(_In_opt_ HWND hWnd,
_In_opt_ LPCSTR lpText,
_In_opt_ LPCSTR lpCaption,
_In_ UINT uType); //定义hook函数,为了保持栈平衡参数尽量一样
BOOL APIENTRY DllMain( HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
LPTHREAD_START_ROUTINE g_pOrgFunc = (LPTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandle(L"user32.dll"), "MessageBoxA");//获取模块函数地址
hook_iat("user32.dll", g_pOrgFunc, (PROC)mymsgbox);//iat hook
}
break;
case DLL_PROCESS_DETACH:
{
LPTHREAD_START_ROUTINE g_pOrgFunc = (LPTHREAD_START_ROUTINE)GetProcAddress(GetModuleHandle(L"user32.dll"), "MessageBoxA");
hook_iat("user32.dll", (LPTHREAD_START_ROUTINE)mymsgbox, (PROC)g_pOrgFunc);
}
break;
}
return TRUE;
}
int _stdcall mymsgbox(_In_opt_ HWND hWnd,
_In_opt_ LPCSTR lpText,
_In_opt_ LPCSTR lpCaption,
_In_ UINT uType)
{
MessageBoxA(hWnd, "hooked_by_psb", lpCaption, uType);
return 0;
}
BOOL hook_iat(LPCSTR szDllName, LPTHREAD_START_ROUTINE pfnOrg, PROC pfnNew)
{
HMODULE hMod;
LPCSTR szLibName;
PIMAGE_IMPORT_DESCRIPTOR pImportDesc;
PIMAGE_THUNK_DATA pThunk;
DWORD dwOldProtect, dwRVA;
PBYTE pAddr;
hMod = GetModuleHandle(NULL);
pAddr = (PBYTE)hMod;
pAddr += *((DWORD*)&pAddr[0x3C]);
dwRVA = *((DWORD*)&pAddr[0x80]);
pImportDesc = (PIMAGE_IMPORT_DESCRIPTOR)((DWORD)hMod + dwRVA);
for (; pImportDesc->Name; pImportDesc++)
{
szLibName = (LPCSTR)((DWORD)hMod + pImportDesc->Name);
if (!_stricmp(szLibName, szDllName))//对比导入表libname是否相同
{
pThunk = (PIMAGE_THUNK_DATA)((DWORD)hMod + pImportDesc->FirstThunk);
for (; pThunk->u1.Function; pThunk++)//遍历函数
{
if (pThunk->u1.Function == (DWORD)pfnOrg)
{
VirtualProtect((LPVOID)&pThunk->u1.Function, PAGE_EXECUTE_READWRITE, PAGE_EXECUTE_READWRITE, &dwOldProtect);
pThunk->u1.Function = (DWORD)pfnNew;//hook
VirtualProtect((LPVOID)&pThunk->u1.Function, PAGE_EXECUTE_READWRITE, dwOldProtect, &dwOldProtect);
return TRUE;
}
}
}
}
return FALSE;
}