Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
N/A (single event) |
Deduplication Period |
1 Day |
Required Data |
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Detection Modules |
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Detector Tags |
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ATT&CK Tactic |
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ATT&CK Technique |
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Severity |
Informational |
Description
A locked-out user account (event ID 4725 or 4740) was used in a Kerberos TGT pre-authentication attempt.
Attacker's Goals
Authenticate using the principal in the TGT, not knowing that it has been revoked.
Investigative actions
- Check whether you have issues with your Cloud Identity Engine failing to sync data from Active Directory.
- Check whether the attempt to use the principals (user accounts) specified in the alert are legitimate. For example, a user or a script that was not updated that the account has been revoked.
- The lockout can be temporary, for example, in the case of too many login attempts, and may not be visible after the account was released.
- Search for Windows Event Log 4740 to ascertain whether the account was locked out during the time of the alert.