第27章:代码注入(略)

实现代码注入不仅需要将需要执行的代码写入对应的进程,还需要将对应的数据也写入其中.

代码注入是一个可执行程序对另一个程序的注入,main函数通过调用InjectCode函数实现注入

BOOL InjectCode(DWORD dwPID)
{
    HMODULE         hMod            = NULL;
    THREAD_PARAM    param           = {0,};
    HANDLE          hProcess        = NULL;
    HANDLE          hThread         = NULL;
    LPVOID          pRemoteBuf[2]   = {0,};
    DWORD           dwSize          = 0;

    hMod = GetModuleHandleA("kernel32.dll");

    // set THREAD_PARAM  前面定义了一系列的结构体变量
    param.pFunc[0] = GetProcAddress(hMod, "LoadLibraryA");
    param.pFunc[1] = GetProcAddress(hMod, "GetProcAddress");
    strcpy_s(param.szBuf[0], "user32.dll");
    strcpy_s(param.szBuf[1], "MessageBoxA");
    strcpy_s(param.szBuf[2], "www.reversecore.com");
    strcpy_s(param.szBuf[3], "ReverseCore");

    // Open Process
    if ( !(hProcess = OpenProcess(PROCESS_ALL_ACCESS,   // dwDesiredAccess
                                  FALSE,                // bInheritHandle
                                  dwPID)) )             // dwProcessId
    {
        printf("OpenProcess() fail : err_code = %d
", GetLastError());
        return FALSE;
    }

    // Allocation for THREAD_PARAM 将自定义的结构体数据写入目标进程内
    dwSize = sizeof(THREAD_PARAM);
    if( !(pRemoteBuf[0] = VirtualAllocEx(hProcess,          // hProcess
                                      NULL,                 // lpAddress
                                      dwSize,               // dwSize
                                      MEM_COMMIT,           // flAllocationType
                                      PAGE_READWRITE)) )    // flProtect
    {
        printf("VirtualAllocEx() fail : err_code = %d
", GetLastError());
        return FALSE;
    }

    if( !WriteProcessMemory(hProcess,                       // hProcess
                            pRemoteBuf[0],                  // lpBaseAddress
                            (LPVOID)&param,                 // lpBuffer
                            dwSize,                         // nSize
                            NULL) )                         // [out] lpNumberOfBytesWritten
    {
        printf("WriteProcessMemory() fail : err_code = %d
", GetLastError());
        return FALSE;
    }


    // Allocation for ThreadProc() 将代码写入目标进程中
    dwSize = (DWORD)InjectCode - (DWORD)ThreadProc;     //地址相减,函数写的时候是ThreadProc前面,InjectCode在后面.
    if( !(pRemoteBuf[1] = VirtualAllocEx(hProcess,          // hProcess
                                      NULL,                 // lpAddress
                                      dwSize,               // dwSize
                                      MEM_COMMIT,           // flAllocationType
                                      PAGE_EXECUTE_READWRITE)) )    // flProtect
    {
        printf("VirtualAllocEx() fail : err_code = %d
", GetLastError());
        return FALSE;
    }

    if( !WriteProcessMemory(hProcess,                       // hProcess
                            pRemoteBuf[1],                  // lpBaseAddress
                            (LPVOID)ThreadProc,             // lpBuffer
                            dwSize,                         // nSize
                            NULL) )                         // [out] lpNumberOfBytesWritten
    {
        printf("WriteProcessMemory() fail : err_code = %d
", GetLastError());
        return FALSE;
    }

    if( !(hThread = CreateRemoteThread(hProcess,            // hProcess
                                       NULL,                // lpThreadAttributes
                                       0,                   // dwStackSize
                                       (LPTHREAD_START_ROUTINE)pRemoteBuf[1],     // dwStackSize
                                       pRemoteBuf[0],       // lpParameter
                                       0,                   // dwCreationFlags
                                       NULL)) )             // lpThreadId
    {
        printf("CreateRemoteThread() fail : err_code = %d
", GetLastError());
        return FALSE;
    }

    WaitForSingleObject(hThread, INFINITE);    

    CloseHandle(hThread);
    CloseHandle(hProcess);

    return TRUE;
}

现在暂时用不上,留作以后参考