Analytics Alerts

Browse the Cortex analytics alert reference.

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202 alerts match the current filters. tactic: TA0006 ✕

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  • Weakly-Encrypted Kerberos TGT Response Informational 1 variation

    A weakly encrypted Kerberos TGT was issued by a domain controller. The encryption type is abnormal for this DC and results in a TGT that is easier to crack. This behavior may indicate a Skeleton Key attack.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Day
    ATT&CK tactics: Credential Access (TA0006) Defense Evasion (TA0005) Persistence (TA0003)
    ATT&CK techniques: Modify Authentication Process: Domain Controller Authentication (T1556.001)
    Required data: Palo Alto Networks Firewall EAL Logs XDR Agent
    Attacker's goals: Manipulate the domain controller authentication process to bypass standard authentication and gain access to hosts and resources in environments relying on single-factor authentication.
    Investigative actions: Identify the user or entity that requested the TGT during the alert timeframe. Determine whether a legitimate service or application requested weak Kerberos encryption. Verify whether the domain controller is patched against the Skeleton Key vulnerability (CVE-2016-1567).

    Variations

    Abnormal Weakly-Encrypted Kerberos TGT Response

    Low overridden

    A weakly encrypted Kerberos TGT was issued by a domain controller. The encryption type is abnormal for this DC and results in a TGT that is easier to crack. This behavior may indicate a Skeleton Key attack. overridden

  • Weakly-Encrypted Kerberos Ticket Requested Low 1 variation

    A user specifically requested weak and deprecated encryption in a Kerberos TGS request. This provides easy-to-crack hashes and is typically a sign of a Kerberoasting attack.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    30 Days
    ATT&CK tactics: Credential Access (TA0006)
    ATT&CK techniques: Steal or Forge Kerberos Tickets: Kerberoasting (T1558.003)
    Required data: Palo Alto Networks Firewall traffic Logs XDR Agent
    Attacker's goals: Crack account credentials by obtaining an easy-to-crack Kerberos ticket.
    Investigative actions: Check who used the host at the time of the alert to rule out a benign service or tool requesting weak Kerberos encryption.

    Variations

    Weakly-Encrypted Kerberos Ticket Requested on a sensitive server

    Medium overridden

    A user specifically requested weak and deprecated encryption in a Kerberos TGS request. This provides easy-to-crack hashes and is typically a sign of a Kerberoasting attack. This action occurred on a sensitive server, which may indicate a malicious activity. overridden