Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
10 Minutes |
Deduplication Period |
1 Hour |
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 |
Low |
Description
The endpoint failed an unusual number of Kerberos pre-authentications (TGT requests) from at least three users when compared to its baseline.
This can indicate a password-spraying attack.
Attacker's Goals
The attacker is attempting to gain an initial foothold in the domain using a list of valid users and a guessed password.
Investigative actions
- Verify whether the host that generated the alert is normally used by many users (for example, a terminal server).
- Verify any later authentication success for the user accounts referenced by the alert, as these can indicate the attacker managed to guess the credentials.