Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. technique: T1087 ✕

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  • Possible Kerberos User Enumeration Informational Identity Analytics 1 variation

    Multiple Kerberos TGT requests with KDC_ERR_C_PRINCIPAL_UNKNOWN errors were generated on different users in the last 10 minutes which may indicate Kerberos user enumeration.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    10 Minutes
    Deduplication:
    1 Day
    ATT&CK tactics: Discovery (TA0007)
    ATT&CK techniques: Account Discovery: Domain Account (T1087.002)
    Required data: XDR Agent with eXtended Threat Hunting (XTH)
    Attacker's goals: The attacker may attempt to gain an initial foothold in the domain by enumerating users.
    Investigative actions: Identify the source host from which the failed logons originated, by making sure the IP is not a shared address. Check the host from which the errors originated, and verify the legitimacy of the TGT requests. Correlate successful logons from the source host to identify potential account compromises following the failed attempts. Review source host activity to detect any additional suspicious or lateral movement behavior.

    Variations

    Possible Kerberos User Enumeration Involving Exposed Users

    Low overridden

    Multiple Kerberos TGT requests with KDC_ERR_C_PRINCIPAL_UNKNOWN errors were generated on different users in the last 10 minutes which may indicate Kerberos user enumeration. overridden