Remote Hash Extraction On Demand Via Host Security Descriptor Modification

This is the long overdue follow-up to the “An ACE in the Hole: Stealthy Host Persistence via Security Descriptors” presentation (slides and video) that @tifkin_, @enigma0x3, and I gave at DerbyCon last year. This past weekend we gave a talk at @Sp4rkCon titled “The Unintended Risks of Trusting Active Directory” that explored combining our host-based …

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The PowerView PowerUsage Series #4

This is a short follow-up to my “A Guide to Attacking Domain Trusts” post, and the fourth post in my “PowerView PowerUsage” series. It follows the same Scenario/Solution/Explanation pattern as the previous entries, with the original post containing a constantly updated list of the entire series. One of the methods for trust hopping that I …

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A Guide to Attacking Domain Trusts

It’s been a while (nearly 2 years) since I wrote a post purely on Active Directory domain trusts. After diving into group scoping, I realized a few subtle misconceptions I previously had concerning trusts and group memberships. That, combined with the changes made to PowerView last year, convinced me to publish an up-to-date guide on …

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The PowerView PowerUsage Series #3

This is the third post in my “PowerView PowerUsage” series, and follows the same Scenario/Solution/Explanation pattern as the previous entries. The original post contains a constantly updated list of the entire series. Active Directory access control is something my workmates and I have been very interested in over the past year. So far, this has …

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Hunting With Active Directory Replication Metadata

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 …

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Offensive Encrypted Data Storage (DPAPI edition)

Last September I wrote a post titled “Offensive Encrypted Data Storage” that detailed an approach to securely storing data on disk during offensive engagements. I recently revisited the idea a bit while once again thinking about disk artifacts, and remembered about DPAPI. The Windows Data Protection API (DPAPI) provides a simplified set of cryptographic functions …

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