JP jordanpotti

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.

Whenever you research a certain vulnerability ask yourself these questions and please answer them for us

Logging

Does the exploited service write a log?
(check ls -lrt /var/log or lsof D /var/log/ or lsof | grep servicename)

Does a system service write a log?
(e.g. check with tail -f /var/log/messages)

Kerberos cheatsheet

Bruteforcing

With kerbrute.py:

python kerbrute.py -domain <domain_name> -users <users_file> -passwords <passwords_file> -outputfile <output_file>

With Rubeus version with brute module:

	#@author matterpreter
	#@category
	#@keybinding
	#@menupath
	#@toolbar

	###
	# To import to Neo4j:
	# CREATE CONSTRAINT function_name ON (n:Function) ASSERT n.name IS UNIQUE
	#

	function Invoke-UACBypass {
	<#
	.SYNOPSIS

	Bypasses UAC on Windows 10 by abusing the SilentCleanup task to win a race condition, allowing for a DLL hijack without a privileged file copy.

	Author: Matthew Graeber (@mattifestation), Matt Nelson (@enigma0x3)
	License: BSD 3-Clause
	Required Dependencies: None
	Optional Dependencies: None

	#To Decrypt Jenkins Password from credentials.xml
	#<username>jenkins</username>
	#<passphrase>your-sercret-hash-S0SKVKUuFfUfrY3UhhUC3J</passphrase>


	#go to the jenkins url
	http://jenkins-host/script

	#In the console paste the script
	hashed_pw='your-sercret-hash-S0SKVKUuFfUfrY3UhhUC3J'

	git clone https://github.com/jordanpotti/ElastAlertGrouper.git
	cp ElastAlertGrouper/py-alert.py /bin/
	chmod 755 /bin/py-alert.py
	cp ElastAlertGrouper/alert_rules/* /etc/elastalert/alert_rules/
	service elastalert restart

	<!-- Mimikatz Detection -->
	<ImageLoaded condition="is">C:\Windows\System32\WinSCard.dll</ImageLoaded> <!--MimiKatz Detection Credit: @Cyb3rWard0g: https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for.html -->
	<ImageLoaded condition="is">C:\Windows\System32\cryptdll.dll</ImageLoaded> <!--MimiKatz Detection Credit: @Cyb3rWard0g: https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for.html -->
	<ImageLoaded condition="is">C:\Windows\System32\hid.dll</ImageLoaded> <!--MimiKatz Detection Credit: @Cyb3rWard0g: https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for.html -->
	<ImageLoaded condition="is">C:\Windows\System32\samlib.dll</ImageLoaded> <!--MimiKatz Detection Credit: @Cyb3rWard0g: https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for.html -->
	<ImageLoaded condition="is">C:\Windows\System32\vaultcli.dll</ImageLoaded> <!--MimiKatz Detection Credit: @Cyb3rWard0g: https://cyberwardog.blogspot.com/2017/03/ch

	client:
	hosts:
	- 127.0.0.1
	port: 9200
	url_prefix:
	use_ssl: False
	certificate:
	client_cert:
	client_key:
	ssl_no_validate: False