Posture check · Account security
Account restricted to DES encryption (T1558)
The account uses only DES for Kerberos, a cipher broken decades ago. Checks enabled accounts only.
Why it matters
DES keys fall to offline cracking quickly, so a ticket for this account is far cheaper to break than a modern AES one.
How GraphnAI finds it
It runs after every sync, on each connected domain or tenant on its own. It applies to Active Directory.
It reads:
- The directory attributes
userAccountControlandaccountEnabled
Tiered Fidelity™ level: Theoretical
Every finding from this check carries the Theoretical level.
- TheoreticalThis checkConfigured in the directory. Nothing else checked.
- ConstrainedA constraint on it has been checked.
- ValidatedTelemetry has seen it in use.
How Select Fire™ fixes it
How to fix it
Confirm nothing depends on DES. Then clear the DES-only flag and reset the password so the account gets AES keys.
What Select Fire changes
Select Fire opens from the finding and simulates each change on your live graph before anything changes in your directory.
- Allow modern Kerberos encryptionSemi-Auto, or Full-Auto when an Admin allows this action and every Full-Auto check passes. Never on a Tier 0 or Tier 1 account.
Clearing the restriction lets the account use modern Kerberos encryption. A client that can only speak the older algorithm stops working with it.
- Require a password change For user accounts.Semi-Auto, or Full-Auto when an Admin allows this action and every Full-Auto check passes. Never on a Tier 0 or Tier 1 account.
The account must set a new password at its next logon. A service or scheduled task running as it fails until someone does.
Related checks
MITRE ATT&CK® technique names and MITRE D3FEND™ technique labels: © The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. ATT&CK® is a registered trademark and D3FEND™ a trademark of The MITRE Corporation.
See it on your own directory.
The Public Preview is free for 30 days from your first sync, on your own server.