With the recent release of BloodHound’s ACL Attack Path Update as well as the work on Active Directory DACL backdooring by @_wald0 and myself (whitepaper here), I started to investigate ACL-based attack paths from a defensive perspective. Sean Metcalf has done some great work concerning Active Directory threat hunting (see his 2017 BSides Charm “Detecting the Elusive: Active Directory Threat Hunting” presentation) and I wanted to show how replication metadata can help in detecting this type of malicious activity. Also, after this post had been drafted, Grégory LUCAND pointed out to me the extensive article (in French) he authored on…