Listen to this Post
Active Directory (AD) hygiene is critical for maintaining a secure and efficient IT environment. One often-overlooked aspect is the cleanup of `SIDHistory` attributes, which can pose security risks if left unmanaged. The CleanupMonster tool by Evotec automates this process, ensuring a cleaner and more secure AD infrastructure.
You Should Know:
1. Understanding SIDHistory Risks
- SIDHistory stores previous Security Identifiers (SIDs) after migrations, which attackers can exploit for privilege escalation.
- Orphaned or stale SIDHistory entries can lead to unauthorized access.
2. Installing CleanupMonster
Download the tool from Evotec’s GitHub.
Install-Module -Name CleanupMonster -Force -AllowClobber
3. Running SIDHistory Cleanup
Scan for problematic SIDHistory entries:
Get-ADSIDHistoryCleanup -ReportOnly -Verbose
Remove invalid SIDHistory attributes:
Remove-ADSIDHistoryCleanup -Force
4. Automating with Scheduled Tasks
Create a PowerShell script (`CleanupSIDHistory.ps1`):
Import-Module CleanupMonster Remove-ADSIDHistoryCleanup -Force
Schedule it via Task Scheduler:
Register-ScheduledTask -Action (New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-File C:\Scripts\CleanupSIDHistory.ps1") -Trigger (New-ScheduledTaskTrigger -Daily -At 3AM)
5. Verifying Cleanup
Check logs and validate with:
Get-ADSIDHistoryCleanup -ReportOnly | Export-Csv -Path "C:\Audit\SIDHistory_Report.csv"
6. Additional AD Hygiene Commands
- Find Inactive Users:
Search-ADAccount -AccountInactive -TimeSpan 90:00:00:00 -UsersOnly | Export-Csv "InactiveUsers.csv"
- Cleanup Old Computer Objects:
Get-ADComputer -Filter {LastLogonDate -lt (Get-Date).AddDays(-90)} | Remove-ADComputer -Confirm:$false
What Undercode Say:
Maintaining Active Directory hygiene is non-negotiable for security. Tools like CleanupMonster simplify SIDHistory cleanup, but administrators should also:
– Regularly audit Group Memberships (Get-ADGroupMember).
– Monitor Replication Health (repadmin /showrepl).
– Use BloodHound for attack path analysis.
– Implement Least Privilege via Set-ADAccountControl.
Expected Output:
- A secure, well-audited AD environment.
- Automated cleanup of SIDHistory and stale objects.
- Reduced attack surface for privilege escalation.
For more details, visit: Evotec.xyz.
References:
Reported By: Florian Hansemann – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
