May 29 2020
In May 2020, I presented some Active Directory security topics in a Trimarc Webcast called “Securing Active Directory: Resolving Common Issues” and included some information I put together relating to the security of AD Group Managed Service Accounts (GMSA). This post includes the expanded version of attacking and defending GMSAs I covered in the webcast.I …
Oct 10 2018
At DerbyCon 8 (2018) over the weekend Will Schroeder (@Harmj0y), Lee Christensen (@Tifkin_), & Matt Nelson (@enigma0x3), spoke about the unintended risks of trusting AD. They cover a number of interesting persistence and privilege escalation methods, though one in particular caught my eye. Overview Lee figured out and presents a scenario where there’s an account …
Jan 01 2018
I have been fascinated with Read-Only Domain Controllers (RODCs) since RODC was released as a new DC promotion option with Windows Server 2008. Microsoft customers wanted a DC that wasn’t really a DC. – something that could be deployed in a location that’s not physically secure and still be able to authenticate users. This post …
Feb 05 2017
Introduction Kerberoasting can be an effective method for extracting service account credentials from Active Directory as a regular user without sending any packets to the target system. This attack is effective since people tend to create poor passwords. The reason why this attack is successful is that most service account passwords are the same length …
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