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AD-GRP-05: Group SID History count should be retrievable
ID AD-GRP-05
Severity Info
Suite Active Directory (on-premises)
Product Active Directory
Feature Groups
Security area Identity lifecycle and hygiene
Resource type Group
MITRE ATT&CK T1134.005
Reads from On-premises Active Directory

What this checks and how to fix it

Section titled “What this checks and how to fix it”
  • SID History is an attribute used during Active Directory domain migrations to maintain access to resources in the source domain:
  • Groups with SID History are important to monitor because persistent SID History on groups can indicate:
  • Incomplete migrations: Groups that were migrated but never fully transitioned
  • Security risks: SIDs from untrusted or decommissioned domains may grant unintended access
  • Directory bloat: Unnecessary data that complicates troubleshooting and auditing
  • Audit complexity: Makes it difficult to determine effective permissions
  • Trust dependencies: Hidden dependencies on domains that may no longer exist
  • Groups with SID History are particularly concerning because they often control access to resources, and the SID History may grant access to users or groups from the source domain.

Control Type

Section titled “Control Type”

Detective

Security Recommendation

Section titled “Security Recommendation”
  • Review all groups with SID History to determine if migration is complete
  • Remove SID History attributes once group memberships are verified in the new domain
  • Be cautious of SID History containing SIDs from external or untrusted domains
  • Document any groups that legitimately require long-term SID History
  • Regularly audit SID History contents during security reviews

How the Test Works

Section titled “How the Test Works”
  • This test retrieves all group objects from Active Directory and:
  • Checks the SIDHistory attribute for each group
  • Counts groups where SIDHistory is populated with one or more SIDs
  • Calculates the percentage of groups with SID History
Section titled “Related Tests”
  • Test-MtAdGroupStaleCount - Groups with SID History may also be stale if migration was long ago
  • Test-MtAdGroupAdminCount - Privileged groups with SID History require special attention
Section titled “Related links”

Mito check. Author: soulemike. Open-source licences.

Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).

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