我想出了一个临时解决方案：将所有远程代码放入一个实际的 DLL 中。但是将代码放入 DLL 不是我的目标，所以如果有人想出一个聪明的解决方案，其中 EXE 文件是注入器以及被注入的模块，我会将新答案标记为正确。
尽管有很多关于如何将实际 DLL 注入另一个进程的地址空间的教程，但我仍然放弃了我的解决方案。我只为 UNICODE 和 64 位编写了我的原始解决方案，但我尽我所能使它适用于 ASCII 和 UNICODE 以及 32 位和 64 位。但是让我们开始吧……
首先解释一下基本步骤
-
获得至少具有以下访问权限的目标进程的句柄
PROCESS_CREATE_THREAD
PROCESS_QUERY_INFORMATION
PROCESS_VM_OPERATION
PROCESS_VM_WRITE
PROCESS_VM_READ
-
为远程线程过程分配内存以及加载目标 dll 及其“入口点”所需的数据和函数指针（我不是指实际的入口点 DllMain，而是设计为从远程线程内调用的函数)
PVOID pThread = VirtualAllocEx(hProc, NULL, 4096, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
-
将远程线程过程和重要数据复制到目标进程
WriteProcessMemory(hProc, pThread, ThreadProc, ThreadProcLen, NULL);
WriteProcessMemory(hProc, pParam, &data, sizeof(ThreadData), NULL);
-
创建远程线程。该线程会将目标dll加载到目标进程的地址空间并调用其“入口点”
HANDLE hThread = CreateRemoteThread(hProc, NULL, 0, (PTHREAD_START_ROUTINE)pThread, pParam, NULL, NULL);
-
可选：等到线程返回
WaitForSingleObject(hThread, INFINITE);
DWORD threadExitCode;
GetExitCodeThread(hThread, &threadExitCode);
-
关闭线程句柄，释放内存，关闭进程句柄
CloseHandle(hThread);
VirtualFreeEx(hProc, pThread, 4096, MEM_RELEASE);
CloseHandle(hProc);
这是我的ThreadProc 和ThreadData 结构。 ThreadProc是CreateRemoteThread调用的远程线程过程，应该LoadLibrary目标dll，所以它可以调用目标dll的“入口点”。 ThreadData结构包含LoadLibrary、GetProcAddress和FreeLibrary的地址，目标dll的路径TargetDll和“入口点”的名称DllEntry。
typedef struct {
typedef BOOL (__stdcall *_FreeLibrary) (HMODULE);
typedef FARPROC (__stdcall *_GetProcAddress) (HMODULE, LPCH);
typedef HMODULE (__stdcall *_LoadLibrary) (LPTSTR);
typedef void (__stdcall *_DllEntry) ();
_LoadLibrary LoadLibrary;
TCHAR TargetDll[MAX_PATH];
_GetProcAddress GetProcAddress;
CHAR DllEntry[50]; // Some entrypoint designed to be
// called from the remote thread
_FreeLibrary FreeLibrary;
} ThreadData, *PThreadData;
// ThreadProcLen should be smaller than 3400, because ThreadData can
// take up to 644 bytes unless you change the length of TargetDll or
// DllEntry
#define ThreadProcLen (ULONG_PTR)2048
#define SPY_ERROR_OK (DWORD)0
#define SPY_ERROR_LOAD_LIB (DWORD)1
#define SPY_ERROR_GET_PROC (DWORD)2
DWORD ThreadProc (PVOID pParam) {
DWORD err = SPY_ERROR_OK;
PThreadData p = (PThreadData)pParam;
// Load dll to be injected
HMODULE hLib = p->LoadLibrary(p->TargetDll);
if (hLib == NULL)
return SPY_ERROR_LOAD_LIB;
// Obtain "entrypoint" of dll (not DllMain)
ThreadData::_DllEntry pDllEntry = (ThreadData::_DllEntry)p->GetProcAddress(hLib, p->DllEntry);
if (pDllEntry != NULL)
// Call dll's "entrypoint"
pDllEntry();
else
err = SPY_ERROR_GET_PROC;
// Free dll
p->FreeLibrary(hLib);
return err;
}
然后是实际代码将远程线程过程注入目标进程的地址空间
int main(int argc, char* argv[]) {
// DWORD pid = atoi(argv[1]);
// Open process
HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
if (hProc != NULL) {
// Allocate memory in the target process's address space
PVOID pThread = VirtualAllocEx(hProc, NULL, 4096, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if (pThread != NULL) {
PVOID pParam = (PVOID)((ULONG_PTR)pThread + ThreadProcLen);
// Initialize data to be passed to the remote thread
ThreadData data;
HMODULE hLib = LoadLibrary(TEXT("KERNEL32.DLL"));
data.LoadLibrary = (ThreadData::_LoadLibrary)GetProcAddress(hLib, "LoadLibrary");
data.GetProcAddress = (ThreadData::_GetProcAddress)GetProcAddress(hLib, "GetProcAddress");
data.FreeLibrary = (ThreadData::_FreeLibrary)GetProcAddress(hLib, "FreeLibrary");
FreeLibrary(hLib);
_tcscpy_s(data.TargetDll, TEXT("...")); // Insert path of target dll
strcpy_s(data.DllEntry, "NameOfTheDllEntry"); // Insert name of dll's "entrypoint"
// Write procedure and data into the target process's address space
WriteProcessMemory(hProc, pThread, ThreadProc, ThreadProcLen, NULL);
WriteProcessMemory(hProc, pParam, &data, sizeof(ThreadData), NULL);
// Create remote thread (ThreadProc)
HANDLE hThread = CreateRemoteThread(hProc, NULL, 0, (PTHREAD_START_ROUTINE)pThread, pParam, NULL, NULL);
if (hThread != NULL) {
// Wait until remote thread has finished
if (WaitForSingleObject(hThread, INFINITE) == WAIT_OBJECT_0) {
DWORD threadExitCode;
// Evaluate exit code
if (GetExitCodeThread(hThread, &threadExitCode) != FALSE) {
// Evaluate exit code
} else {
// The thread's exit code couldn't be obtained
}
} else {
// Thread didn't finish for some unknown reason
}
// Close thread handle
CloseHandle(hThread);
}
// Deallocate memory
VirtualFreeEx(hProc, pThread, 4096, MEM_RELEASE);
} else {
// Couldn't allocate memory in the target process's address space
}
// Close process handle
CloseHandle(hProc);
}
return 0;
}
被注入的dll有一个真正的入口点DllMain，当LoadLibrary将目标dll加载到目标进程的地址空间时，另一个“入口点”NameOfTheDllEntry被远程线程过程调用（如果它可以先定位）
// Module.def:
// LIBRARY NameOfDllWithoutExtension
// EXPORTS
// NameOfTheDllEntry
__declspec(dllexport) void __stdcall NameOfTheDllEntry () {
// Because the library is actually loaded in the target process's address
// space, there's no need for obtaining pointers to every function.
// I didn't try libraries other than kernel32.dll and user32.dll, but they
// should be working as well as long as the dll itself references them
// Do stuff
return;
}
BOOL APIENTRY DllMain (HMODULE hLib, DWORD reason, PVOID) {
if (reason == DLL_PROCESS_ATTACH)
DisableThreadLibraryCalls(hLib); // Optional
return TRUE;
}