[英]Process Injector Crashes on CreateRemoteThread
我在 C 中創建了一個用於檢測工程目的的進程 DLL 注入器,它似乎在我在 shell 中生成的測試進程上工作得很好(可能是因為它們在同一路徑中,或者是非 shell 和 printf 的東西)但是每當我測試時它在一個隨機進程中它在 CreateRemoteThread 步驟崩潰了該進程,想知道你們是否可以提供幫助,謝謝。
這是我使用的命令(Bash):./ProcessInjector.exe [PID] C:\\Users\\wsam\\Documents\\Process-Injection\\bad_dll.dll
編輯:我注意到如果我在循環中取出 bad_dll.dll 中的所有代碼,它會成功創建一個線程並且不會使進程崩潰,這是為什么?
進程注入器
#include <windows.h>
#include <string.h>
#include <stdio.h>
#include <tlhelp32.h>
int main(int argc, char* argv[]){
char dllPath[MAX_PATH];
strcpy(dllPath, argv[2]);
printf("Victim PID : %s\n", argv[1]);
// use full or relative path
printf("DLL to inject : %s\n", argv[2]);
// get Handle from proc id
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, atoi(argv[1]));
if (hProcess == NULL) {
printf("[---] Failed to open process %s.\n", argv[1]);
return 1;
}
printf("Press Enter to attempt DLL injection.");
getchar();
// Allocate memory for DLL's path
LPVOID dllPathAlloc = VirtualAllocEx(hProcess, NULL, strlen(dllPath), MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if(dllPathAlloc == NULL){
printf("[---] VirtualAllocEx unsuccessful.\n");
getchar();
return 1;
}
// Write path to memory
BOOL pathWrote = WriteProcessMemory(hProcess, dllPathAlloc, dllPath, strlen(dllPath), NULL);
if(!pathWrote){
printf("[---] WriteProcessMemory unsuccessful.\n");
getchar();
return 1;
}
// returns pointer to LoadLibrary address, same in every process.
LPVOID loadLibraryAddress = (LPVOID)GetProcAddress(GetModuleHandle("kernel32.dll"), "LoadLibraryA");
if(loadLibraryAddress == NULL){
printf("[---] LoadLibrary not found in process.\n");
getchar();
return 1;
}
// creates remote thread and start mal dll
HANDLE remoteThread = CreateRemoteThread(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)loadLibraryAddress, dllPathAlloc, 0, NULL);
if(remoteThread == NULL){
printf("[---] CreateRemoteThread unsuccessful.\n");
getchar();
return 1;
}
//Start-Address:kernel32.dll!LoadLibraryA
CloseHandle(hProcess);
return 0;
}
bad_dll.c
#include <windows.h>
#include <stdio.h>
#include <unistd.h>
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved){
FILE * fp;
fp = fopen ("C:\\Users\\wsam\\Documents\\Hacked.txt","w");
fprintf (fp, "Hacked\n");
fclose (fp);
while(1){
printf("HACKED\n");
fflush(stdout);
sleep(1);
}
}
這是我使用 VirtualAllocEx、CreateRemoteThread 和 LoadLibrary 的 dll 注入器的非常基本的示例:
#include <iostream>
#include <Windows.h>
#include <TlHelp32.h>
DWORD GetPid(char * targetProcess)
{
HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
if (snap && snap != INVALID_HANDLE_VALUE)
{
PROCESSENTRY32 pe;
pe.dwSize = sizeof(pe);
if (Process32First(snap, &pe))
{
do
{
if (!_stricmp(pe.szExeFile, targetProcess))
{
CloseHandle(snap);
return pe.th32ProcessID;
}
} while (Process32Next(snap, &pe));
}
}
return 0;
}
int main()
{
char * dllpath = "C:\\Users\\me\\Desktop\\dll.dll";
char * processToInject = "csgo.exe";
long pid = 0;
while (!pid)
{
pid = GetPid(processToInject);
Sleep(10);
}
HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, 0, pid);
if (hProc && hProc != INVALID_HANDLE_VALUE)
{
void * loc = VirtualAllocEx(hProc, 0, MAX_PATH, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
WriteProcessMemory(hProc, loc, dllpath, strlen(dllpath) + 1, 0);
HANDLE hThread = CreateRemoteThread(hProc, 0, 0, (LPTHREAD_START_ROUTINE)LoadLibraryA, loc, 0, 0);
CloseHandle(hThread);
}
CloseHandle(hProc);
return 0;
}
此代碼包括獲取路徑字符串的空終止符:
strlen(dllpath) + 1
編輯:我注意到如果我在循環中取出 bad_dll.dll 中的所有代碼,它會成功創建一個線程並且不會使進程崩潰,這是為什么?
我相信您在 DllMain 中的無限循環是您問題的原因,它永遠不會返回。 當您刪除循環中的代碼時,您的編譯器正在優化循環,因此它停止崩潰。
每個人都說永遠不要從 DllMain 調用 CreateThread(),但數百萬人在這樣做時沒有任何問題。 擔心是關於加載程序死鎖,但我已經注入 DLL 5 年了,從來沒有遇到過任何問題,這是我的經驗,我的信念根源於經驗。 您至少應該通過閱讀並點擊此問題中的鏈接了解可能存在的問題。
忽略 DLLMain 中的所有 CRT 我建議你這樣做:
DWORD __stdcall hackthread(HMODULE hModule)
{
FILE * fp;
fp = fopen ("C:\\Users\\wsam\\Documents\\Hacked.txt","w");
fprintf (fp, "Hacked\n");
fclose (fp);
while(1){
printf("HACKED\n");
fflush(stdout);
sleep(1);
}
}
BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, PVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
HANDLE hThread = CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)hackthread, hModule, 0, nullptr);
CloseHandle(hThread);
break;
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
以這種方式,CreateThread 和 DllMain 都返回 99.9999% 的時間。
這是基於我的經驗的概念證明。
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