Kerberos Pre-Auth Failures by Host
Synopsis
Activation Period
14 Days
Training Period
30 Days
Test Period
10 Minutes
Deduplication Period
1 Hour
Required Data
Requires one of the following data sources: Palo Alto Networks Firewall traffic Logs OR XDR Agent
ATT&CK Tactic
Credential Access (TA0006)
ATT&CK Technique
Brute Force (T1110)
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.
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