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Kerberos Pre-Auth Failures by Host

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.

Module:
Platform Analytics
Data source:
Palo Alto Networks Firewall traffic Logs, XDR Agent
ATT&CK tactics: Credential Access (TA0006)
ATT&CK techniques: Brute Force (T1110)
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.

Test period:
10 Minutes
Deduplication:
1 Hour