myhack.cpp

//리버싱 핵심 원리책 myhack.dll 실습 (daum으로 변경)
#include "windows.h"
#include "tchar.h"

#pragma comment(lib, "urlmon.lib")

#define DEF_URL         (L"https://www.daum.net/index.html")
#define DEF_FILE_NAME     (L"index.html")

HMODULE g_hMod = NULL;

DWORD WINAPI ThreadProc(LPVOID lParam)
{
	TCHAR szPath[_MAX_PATH] = { 0, };

	if (!GetModuleFileName(g_hMod, szPath, MAX_PATH))
		return FALSE;

	TCHAR* p = _tcsrchr(szPath, '\\');
	if (!p)
		return FALSE;

	_tcscpy_s(p + 1, _MAX_PATH, DEF_FILE_NAME);
	URLDownloadToFile(NULL, DEF_URL, szPath, 0, NULL);

	return 0;
}

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
	HANDLE hThread = NULL;

	g_hMod = (HMODULE)hinstDLL;

	switch (fdwReason)
	{
	case DLL_PROCESS_ATTACH :
		OutputDebugString(L"myhack.dll Injection!!!");
		hThread = CreateThread(NULL, 0, ThreadProc, NULL, 0, NULL);
		CloseHandle(hThread);
		break;
	}

	return TRUE;
}