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实战｜使用Windows API绕过进程保护
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首发于奇安信攻防社区 文章地址：https://forum.butian.net/share/817 前言最近在研究某数字杀软的时候看到有个配置选项：  img 这个自我保护实际上是加载360SelfProtection.sys驱动(看这名字应该还有360SelfProtection_win10.sys文件)，在0环通过hook等手段保护注册表项，重要进程进程等。  img 比如这里要结束某核心进程，会显示无法结束，拒绝访问。  img  img 这个并不是说权限不够的问题，即便是system权限也不行。而是由于在底层，杀死进程的API已经被hook了，这里应该是内核hook，当想要结束的进程为核心进程时，就直接返回一个无法终止进程的弹窗。本文就如何实现一个进程保护功能进行探究，驱动就不写了，就写一个用户层的。 实现原理windows提供了一个可以杀死其他进程的API：TerminateProcess。如果是结束本身进程为：ExitProcess。 代码语言：javascript复制BOOL TerminateProcess([in] HANDLE hProcess,[in] UINT uExitCode);通过命令taskkill或者通过任务管理器等GUI工具去结束进程，本质上都是调用的TerminateProcess，有些可能是调用更为底层的ZwTerminateProcess，但是本质都差不多，只是看该进程用的什么API，这里为了方便就使用TerminateProcess进行演示。 通过hook TerminateProcess让执行该函数时直接返回没有权限。 获取API地址并创建新的hook函数 代码语言：javascript复制static BOOL(WINAPI* OldTerminateProcess)( HANDLE hProcess, UINT uExitCode) = TerminateProcess;BOOL WINAPI New_TerminateProcess(_In_ HANDLE hProcess,_In_ UINT uExitCode) { unhookTerminateProcess();MessageBox(NULL,L"该进程受保护！", L"Access Denied",NULL); hookTerminateProcess();returnfalse;}这里是64位的进程，要改变的硬编码是12个字节，而且不需要去算偏移。 代码语言：javascript复制48 b8 _dwNewAddress(0x1122334455667788)ff e0mov rax, _dwNewAddress(0x1122334455667788)jmp rax将原来函数的调转地址改为我们自己函数的跳转地址 代码语言：javascript复制void hookTerminateProcess() { DWORD dwTerminateProcessOldProtect; BYTE pData[12] = { 0x48,0xb8,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0xFF,0xE0}; ULONGLONG ullNewFuncAddr = (ULONGLONG)New_TerminateProcess;//保存本来的字节::RtlCopyMemory(g_OldTerminateProcess, OldTerminateProcess, sizeof(pData));//更改权限VirtualProtect(OldTerminateProcess, 12, PAGE_EXECUTE_READWRITE, &dwTerminateProcessOldProtect);//更改原来的机器码，改为我们自己函数的地址::RtlCopyMemory(&pData[2], &ullNewFuncAddr, sizeof(ullNewFuncAddr));::RtlCopyMemory(OldTerminateProcess, pData, sizeof(pData));//恢复属性VirtualProtect(OldTerminateProcess, 12, dwTerminateProcessOldProtect, &dwTerminateProcessOldProtect);}恢复硬编码，还原调转地址。 代码语言：javascript复制void unhookTerminateProcess() { DWORD dwOldProtect = NULL;//改为可写属性VirtualProtect(OldTerminateProcess, 12, PAGE_EXECUTE_READWRITE, &dwOldProtect);//还原原来的硬编码RtlCopyMemory(OldTerminateProcess, g_OldTerminateProcess, sizeof(g_OldTerminateProcess));//还原属性VirtualProtect(OldTerminateProcess, 12, dwOldProtect, &dwOldProtect);}最方便的就是写成一个dll，这样注入到任务管理器并起一个线程跑就行了。 代码语言：javascript复制BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved){switch(ul_reason_for_call){case DLL_PROCESS_ATTACH: hookTerminateProcess();break;case DLL_THREAD_ATTACH:break;case DLL_THREAD_DETACH:break;case DLL_PROCESS_DETACH: unhookTerminateProcess();break;}return TRUE;}注入这里也是为了练手，稍微写了一个注入程序，为了以后的方法写成了突破session 0的注入。 代码语言：javascript复制/* * 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 * #include#include#include"tchar.h"#includeusingnamespace std;BOOL EnbalePrivileges(HANDLE hProcess, LPCWSTR pszPrivilegesName){ HANDLE hToken = NULL; LUID luidValue = { 0}; TOKEN_PRIVILEGES tokenPrivileges = { 0}; BOOL bRet = FALSE; DWORD dwRet = 0;// 打开进程令牌并获取进程令牌句柄 bRet = ::OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES, &hToken);if(FALSE == bRet){ printf("[!] Open CurrentProcessToken Error,Error is:%d\n",GetLastError());return FALSE;}else{ printf("[*] Open CurrentProcessToken Successfully!,TokenHandle is:%d\n", hToken);}// 获取本地系统的 pszPrivilegesName 特权的LUID值 bRet = ::LookupPrivilegeValue(NULL, pszPrivilegesName, &luidValue);if(FALSE == bRet){ printf("[!] LookupPrivilegeValue Error,Error is:%d\n", GetLastError());return FALSE;}else{ printf("[*] LookupPrivilegeValue Successfully!\n");}// 设置提升权限信息 tokenPrivileges.PrivilegeCount= 1; tokenPrivileges.Privileges[0].Luid= luidValue; tokenPrivileges.Privileges[0].Attributes= SE_PRIVILEGE_ENABLED;// 提升进程令牌访问权限 bRet = ::AdjustTokenPrivileges(hToken, FALSE, &tokenPrivileges, 0, NULL, NULL);if(FALSE == bRet){ printf("[!] AdjustTokenPrivileges Error,Error is:%d\n", GetLastError());return FALSE;}else{// 根据错误码判断是否特权都设置成功 dwRet = ::GetLastError();if(ERROR_SUCCESS == dwRet){ printf("[√] ALL_ASSIGNED!\n");return TRUE;}elseif(ERROR_NOT_ALL_ASSIGNED == dwRet){ printf("[!] ERROR:NOT_ALL_ASSIGNED,Error is %d\n", dwRet);return FALSE;}}return FALSE;}DWORD EnumModules(DWORD hPid, LPCSTR hMoudlePath){ WCHAR szBuffer[MAX_PATH] = { 0}; mbstowcs(szBuffer, hMoudlePath, MAX_PATH);//通过pid列出所有的Modules HANDLE hModuleSnap = INVALID_HANDLE_VALUE; MODULEENTRY32 me32;//给进程所引用的模块信息设定一个快照 hModuleSnap = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, hPid);if(hModuleSnap == INVALID_HANDLE_VALUE){ printf("[!] Error:Enum modules failed to detect if there is an injected DLL module,error is %d\n",GetLastError());} me32.dwSize = sizeof(MODULEENTRY32);if(!Module32First(hModuleSnap, &me32)){ printf("[!] Enum Error!\n");CloseHandle(hModuleSnap);}do{if(!memcmp(me32.szExePath, szBuffer,MAX_PATH))return1; } while(Module32Next(hModuleSnap, &me32));CloseHandle(hModuleSnap);return0;}DWORD _InjectThread(DWORD _Pid, LPCSTR psDllPath){ FILE* fp; fp = fopen(psDllPath, "r");if(!fp){ printf("[!] Error:DLL path not found\nPlease check that your path is correct or absolute\n");return FALSE;} fclose(fp); printf("****************************************************************************\n"); HANDLE hprocess = NULL; HANDLE hThread = NULL; DWORD _SIZE = 0; LPVOID pAlloc = NULL; FARPROC pThreadFunction = NULL; DWORD ZwRet= 0; hprocess = ::OpenProcess(PROCESS_ALL_ACCESS, FALSE, _Pid);if(hprocess == NULL){printf("[!] OpenProcess Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] OpenProcess Successfully!\n");}_SIZE = strlen(psDllPath)+1;pAlloc = ::VirtualAllocEx(hprocess, NULL, _SIZE, MEM_COMMIT, PAGE_READWRITE);if(pAlloc == NULL){printf("[!] VirtualAllocEx Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] VirtualAllocEx Successfully!\n");}BOOL x = ::WriteProcessMemory(hprocess, pAlloc, psDllPath, _SIZE, NULL);if(FALSE == x){printf("[!] WriteMemory Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] WriteMemory Successfully!\n");}HMODULE hNtdll = LoadLibrary(L"ntdll.dll");if(hNtdll == NULL){printf("[!] LoadNTdll Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] Load ntdll.dll Successfully!\n");}pThreadFunction = ::GetProcAddress(::GetModuleHandle(L"kernel32.dll"), "LoadLibraryA");if(pThreadFunction == NULL){printf("[!] Get LoadLibraryA Address Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] Get LoadLibraryA Address Successfully! Address is %x\n", pThreadFunction);}#ifdef _WIN64typedef DWORD(WINAPI* typedef_ZwCreateThreadEx)(PHANDLE ThreadHandle,ACCESS_MASK DesiredAccess,LPVOID ObjectAttributes,HANDLE ProcessHandle,LPTHREAD_START_ROUTINE lpStartAddress,LPVOID lpParameter,ULONG CreateThreadFlags,SIZE_T ZeroBits,SIZE_T StackSize,SIZE_T MaximumStackSize,LPVOID pUnkown);#elsetypedef DWORD(WINAPI* typedef_ZwCreateThreadEx)(PHANDLE ThreadHandle,ACCESS_MASK DesiredAccess,LPVOID ObjectAttributes,HANDLE ProcessHandle,LPTHREAD_START_ROUTINE lpStartAddress,LPVOID lpParameter,BOOL CreateSuspended,DWORD dwStackSize,DWORD dw1,DWORD dw2,LPVOID pUnkown);#endiftypedef_ZwCreateThreadEx ZwCreateThreadEx= NULL;ZwCreateThreadEx= (typedef_ZwCreateThreadEx)::GetProcAddress(hNtdll, "ZwCreateThreadEx");if(ZwCreateThreadEx== NULL){printf("[!] Get ZwCreateThreadEx Address Error,Error is:%d\n", GetLastError());return FALSE;}else{printf("[*] Get ZwCreateThreadEx Address Successfully! Address is %x\n", ZwCreateThreadEx);}HANDLE hRemoteThread;ZwRet= ZwCreateThreadEx(&hRemoteThread, PROCESS_ALL_ACCESS, NULL, hprocess,(LPTHREAD_START_ROUTINE)pThreadFunction, pAlloc, 0, 0, 0, 0, NULL);if(hRemoteThread == NULL){printf("[!] Creat RemoteThread Error,Error is:%d\n", GetLastError());CloseHandle(hprocess);return FALSE;}printf("[*] Please wait for a moment in the process of injection:\n");for(int m = 0;m |
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