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Authentication Policy Silos (APS) in Active Directory allow administrators to enforce stricter controls on user and computer authentication. By isolating high-value accounts in a “security bubble,” APS ensures that only approved devices can access them, adding an extra layer of protection. This strategy mitigates the risk of credential misuse, even if a threat actor obtains credential material.
You Should Know:
To implement Authentication Policy Silos, follow these steps and commands:
1. Create an Authentication Policy Silo:
Use the following PowerShell command to create a new APS:
New-ADAuthenticationPolicySilo -Name "HighValueAccounts" -Description "Silo for privileged accounts" -UserAuthenticationPolicy "RestrictivePolicy" -ComputerAuthenticationPolicy "RestrictivePolicy"
2. Add Users and Computers to the Silo:
Assign users and computers to the APS using:
Add-ADAuthenticationPolicySiloMember -Identity "HighValueAccounts" -Members "User1", "Computer1"
3. Configure Authentication Policies:
Create and link authentication policies to the silo:
New-ADAuthenticationPolicy -Name "RestrictivePolicy" -Enforce -UserAllowedToAuthenticateFrom "AllowedDevices"
4. Verify Silo Configuration:
Check the APS configuration with:
Get-ADAuthenticationPolicySilo -Identity "HighValueAccounts"
5. Monitor and Audit:
Regularly monitor authentication attempts and audit logs using:
Get-ADAuthenticationPolicySiloAudit -Identity "HighValueAccounts"
What Undercode Say:
Authentication Policy Silos are a powerful tool for securing privileged accounts in Active Directory. By isolating high-value accounts and enforcing strict authentication policies, organizations can significantly reduce the risk of credential misuse. Implementing APS requires careful planning and regular monitoring, but the added security is well worth the effort. For further reading, refer to the Obsidian Publish blog on defensive strategies.
Related Commands:
– `Get-ADUser -Filter *` to list all users in the domain.
– `Get-ADComputer -Filter *` to list all computers in the domain.
– `Set-ADAccountPassword -Identity User1 -Reset` to reset a user’s password.
– `Enable-ADAccount -Identity User1` to enable a disabled account.
– `Get-ADDomainController -Discover` to locate domain controllers.
By leveraging these commands and strategies, you can enhance your organization’s security posture and protect critical assets from potential threats.
References:
Reported By: Spenceralessi Authentication – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
