CreateRemoteThread不适用于DLL

Question

我正在尝试注入一个在目标进程中创建MessageBox的简单dll。使用来自www的注入器工作没有任何问题。然而，使用我自己的代码注入根本不会做任何事情(我在notepad.exe上使用它)。

我在VS2017中将dll和这段代码编译为x64 debug。Injector被创建为Win32控制台项目。

代码中的所有阶段都通过了。我得到了进程的句柄，线程句柄也是有效的。然而，GetExitCode返回0，所以它总是失败，但我不知道为什么？

    HANDLE process = OpenProcess(PROCESS_ALL_ACCESS, false, pid);

if (process == NULL)
{
    std::cout << "Error opening process." << std::endl;
    return false;
}

const char * dllString = "C:\\test.dll";

// load memory for dll

int bytes = sizeof(dllString);


PVOID mem = VirtualAllocEx(process, NULL, sizeof(dllString) + 1, MEM_COMMIT, PAGE_READWRITE);

if (mem == NULL)
{
    std::cout << "Unable to allocate mem." << std::endl;
    CloseHandle(process);
    return false;
}

// write dll path to that location
SIZE_T bytesWritten;
BOOL status = WriteProcessMemory(process, mem, dllString, sizeof(dllString) + 1, &bytesWritten);

if (!status)
{
    std::cout << "Writing dll path failed." << std::endl;
    VirtualFreeEx(process, mem, sizeof(dllString) + 1, MEM_RELEASE);
    CloseHandle(process);
    return false;
}

FARPROC loadLibrary = GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");

HANDLE thread = CreateRemoteThread(process, NULL, NULL, reinterpret_cast<LPTHREAD_START_ROUTINE>(loadLibrary), mem, NULL, NULL);

if (thread == INVALID_HANDLE_VALUE)
{
    std::cout << "Unable to create thread in remote process. " << std::endl;
    VirtualFreeEx(process, mem, sizeof(dllString) + 1, MEM_RELEASE);
    CloseHandle(process);
}


WaitForSingleObject(thread, INFINITE);

DWORD exitCode = 0;
GetExitCodeThread(thread, &exitCode);

if (exitCode != 0)
    std::cout << "DLL loaded successfully." << std::endl;
else
    std::cout << "DLL loading failed." << std::endl;

CloseHandle(thread);
VirtualFreeEx(process, mem, sizeof(dllString) + 1, MEM_RELEASE);
CloseHandle(process);
return true;

Answer 1

我自己解决的。实际上是个菜鸟问题。sizeof实际上返回的是指针的大小，对于x64是64位，而不是我需要分配的内存的字符串长度。因此，在将其更改为strlen之后，它起作用了。