Welcome to Guardians of the Directory, the podcast where we break down real-world threats, best practices, and insights in Active Directory, Entra ID, and Microsoft identity security.
In today’s episode, Craig Birch dives into one of Active Directory’s oldest — and most quietly dangerous — features: the primaryGroupID. While originally designed for POSIX compatibility and legacy systems, this attribute can now be misused to grant hidden privileges, bypass group auditing, and create stealth admin access.
🔍 In this episode, you'll learn:
What the primaryGroupID attribute is and why it still exists
Why anything other than 513 (Domain Users) should raise red flags
How attackers can leverage this setting to hide elevated privileges
How to detect non-standard values using PowerShell
How to safely remediate misconfigured accounts
Why real-time detection with Cayosoft Guardians is a smarter defense
Craig walks you through not just how to fix the problem — but how to prevent it entirely with intelligent alerting, automation, and policy enforcement.
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