Understanding AdminSDHolder Persistence in Active Directory

Introduction Active Directory environments are designed with multiple safety mechanisms to prevent accidental or malicious privilege escalation—even by administrators. One such mechanism is AdminSDHolder, which quietly enforces strict permissions on high-privilege objects. At first glance, this protection may seem like an obstacle. But when understood correctly, it can become a powerful persistence mechanism. What are we looking at ? Let’s say we already have Domain Admin privileges in a domain. At that point, there’s almost nothing we can’t do. Full control, full access. ...

December 17, 2025 · n0rmh3ll

Crocc Crew — TryHackMe Detailed Writeup

Room Link https://tryhackme.com/room/crocccrew Difficulty Insane Points 120 Summary This room is a full Active Directory attack simulation focused on realistic enterprise privilege escalation. We start with minimal external access, enumerate exposed services, and identify weak entry points into the network. After obtaining low-privileged AD credentials, we move into internal enumeration, discover misconfigurations in Kerberos Constrained Delegation, and exploit it to impersonate privileged users. From there, we extract NT hashes and Kerberos keys, gain full Domain Administrator access, and ultimately compromise the entire domain. ...

November 6, 2025 · n0rmh3ll