VC++通过动态生成并加载DLL，实现可执行文件的自删除

void WriteResourceToFile(HINSTANCE hInstance,int idResource,char const *filename)   
{   
    // 存取二进制资源    
    HRSRC hResInfo = FindResource(hInstance, MAKEINTRESOURCE(idResource),   
    MAKEINTRESOURCE(RC_BINARYTYPE));   
    HGLOBAL hgRes = LoadResource(hInstance, hResInfo);   
    void *pvRes = LockResource(hgRes);   
    DWORD cbRes = SizeofResource(hInstance, hResInfo);   
   
    // 将二进制资源写到文件    
    HANDLE hFile = CreateFile(filename, GENERIC_WRITE, 0, 0, CREATE_ALWAYS,   
    FILE_ATTRIBUTE_NORMAL, 0);   
    DWORD cbWritten;   
    WriteFile(hFile, pvRes, cbRes, &cbWritten, 0);   
    CloseHandle(hFile);   
}   
   
void SelfDelete(HINSTANCE hInstance)   
{   
    char lpDllFile[MAX_PATH];   
    GetTempPath(sizeof(lpDllFile),lpDllFile);   
    lstrcat(lpDllFile,"\\magicdel.dll");   
   
    WriteResourceToFile(hInstance, ID_2561, lpDllFile);   
   
    // 生成命令行    
    // 1. 查找 rundll32.exe    
    char commandLine[MAX_PATH * 3];   
    GetWindowsDirectory(commandLine, sizeof(commandLine));   
    lstrcat(commandLine, "\\rundll32.exe");   
    if (GetFileAttributes(commandLine) == INVALID_FILE_ATTRIBUTES)   
    {   
        GetSystemDirectory(commandLine, sizeof(commandLine));   
        lstrcat(commandLine, "\\rundll32.exe");   
    }   
   
    // 2. 添加 rundll32.exe 参数    
    lstrcat(commandLine, " ");   
    lstrcat(commandLine, lpDllFile);   
    lstrcat(commandLine, ",_MagicDel@16 ");   
   
    // 3. 添加本文件名    
    char lpPath[MAX_PATH];   
    //GetCurrentDirectory(MAX_PATH,lpPath);    
    GetModuleFileName(hInstance, lpPath, sizeof(lpPath));   
    lstrcat(commandLine, lpPath);   
   
    // 执行命令行    
    PROCESS_INFORMATION procInfo;   
    STARTUPINFO startInfo;   
    memset(&startInfo, 0, sizeof(startInfo));   
    startInfo.dwFlags = STARTF_FORCEOFFFEEDBACK;   
    CreateProcess(0, commandLine, 0, 0, FALSE, NORMAL_PRIORITY_CLASS, 0, 0,   
    &startInfo, &procInfo);   
}   
   
int WINAPI WinMain(HINSTANCE hInstance,   
   HINSTANCE hPrevInstance,   
   LPSTR lpCmdLine,   
   int nCmdShow)   
{   
    SelfDelete(hInstance);   
}   

dll源代码。实现自删除

#include    <windows.h>    
#include    <winbase.h>    
HMODULE     g_hmodDLL;   
   
extern "C" BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD reason, LPVOID)   
{   
    if (reason == DLL_PROCESS_ATTACH)   
        g_hmodDLL = hinstDLL;   
    return TRUE;   
}   
   
extern "C" __declspec(dllexport) void DeleteDirectory(LPTSTR lpDirectory,int flag)   
{   
    if (strlen(lpDirectory) = 0) return;   
   
    WIN32_FIND_DATA FindData;   
    HANDLE  lhandle;   
    char    lpfilename[MAX_PATH];   
       
    //设置查找目录名    
    lstrcpy(lpfilename,lpDirectory);   
    if (lpfilename[strlen(lpfilename) - 1] == '\\')   
        lstrcat(lpfilename, "*");   
    else   
        lstrcat(lpfilename, "\\*");   
       
    if (flag)   
    {   
        if (MessageBox(0,lpfilename,"是否清空下列目录？",MB_OKCANCEL)!=IDOK)    
            return;   
    }   
       
    lhandle = FindFirstFile( lpfilename, &FindData );   
    if (lhandle = 0) return;   
       
    while (FindNextFile(lhandle,&FindData))   
    {          
        if (strcmp(FindData.cFileName,"..") == 0)   
            continue;   
           
        //配置完整路径    
        lstrcpy(lpfilename,lpDirectory);   
        lstrcat(lpfilename, "\\");   
        lstrcat(lpfilename, FindData.cFileName);   
                   
        //出现子目录    
        if ((FindData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)   
        {   
            DeleteDirectory(lpfilename,flag);   
            continue;   
        };   
               
        //删除文件    
        DeleteFile(lpfilename);   
           
    };   
   
    FindClose(lhandle);   
   
    //MessageBox(0,lpDirectory,"END Find",MB_OK);    
   
    //删除目录    
    RemoveDirectory(lpDirectory);   
   
}   
   
//删除自身    
extern "C" __declspec(dllexport) void CALLBACK MagicDel(HWND,HINSTANCE,LPTSTR lpCmdLine,int)   
{   
    // 延时2秒    
    Sleep(200);   
    // 删除创建该进程的可执行文件    
    DeleteFile(lpCmdLine);   
    //DeleteDirectory(lpCmdLine,1);    
   
    // 删除DLL自己    
    char filenameDLL[MAX_PATH];   
    GetModuleFileName(g_hmodDLL, filenameDLL, sizeof(filenameDLL));   
   
    __asm   
    {   
        lea eax, filenameDLL   
        push 0   
        push 0   
        push eax   
        push ExitProcess   
        push g_hmodDLL   
        push DeleteFile   
        push FreeLibrary   
        ret   
    }   
}