Computer SID History count should be retrievable
AD-COMP-05InfoActive DirectoryComputers
Part of Active Directory · Active Directory · Computers · All checks
Invoke-Maester -TestId AD-COMP-05Overview
Section titled “Overview”SID History is an attribute used during domain migrations to maintain access to resources in the source domain. While necessary during migrations, persistent SID History on computer accounts can indicate:
- Incomplete migrations: Computers that were migrated but never fully transitioned
- Security risks: SIDs from untrusted or less-secure domains may grant unintended access
- Directory bloat: Unnecessary data in the directory that complicates troubleshooting
- Audit complexity: Makes it harder to determine effective permissions
Control Type
Section titled “Control Type”Detective
Security Recommendation
Section titled “Security Recommendation”- Review computers with SID History to determine if the migration is complete
- Remove SID History attributes once systems are fully migrated and resource access is verified
- Be cautious of SID History containing SIDs from external or untrusted domains
- Document any computers that legitimately require long-term SID History
How the Test Works
Section titled “How the Test Works”This test counts computer objects where the SIDHistory attribute is populated. This attribute typically contains one or more SIDs from the computer’s previous domain(s).
Related Tests
Section titled “Related Tests”Test-MtAdComputerNonStandardGroup- Identifies other migration or configuration anomaliesTest-MtAdComputerDormantCount- Finds stale accounts that may be migration remnants
Related links
Section titled “Related links”- Microsoft Defender for Identity: Unsecure SID History attributes
- ANSSI Active Directory checkpoints: Accounts or groups with SID history set
Details
Section titled “Details”Every attribute of this check
| Field | Value |
|---|---|
| Test ID | AD-COMP-05 |
| Severity | Info |
| Suite | Active Directory |
| Product | Active Directory |
| Feature | Computers |
| Area | Identity lifecycle and hygiene |
| Resource type | Computer |
| MITRE ATT&CK | T1134.005 SID-History Injection |
| PowerShell test | Test-MtAdComputerSidHistoryCount |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Ldap:computer:ReadProperty |
Source
Section titled “Source”- Test:
tests/ad/computer/Test.AD-COMP-05.ps1 - Documentation:
tests/ad/computer/Test.AD-COMP-05.md