splApache-2.0from splunk/security_content

PetitPotam Suspicious Kerberos TGT Request

The following analytic detects a suspicious Kerberos Ticket Granting Ticket (TGT) request, identified by Event Code 4768. This detection leverages Windows Security Event Logs to identify TGT requests with unusual fields, which may indicate the use of tools like Rubeus following the exploitation of CVE-2021-36942 (PetitPotam). This activity is significant as it can signal an attacker leveraging a compromised certificate to request Kerberos tickets, potentially leading to unauthorized access. If confirmed malicious, this could allow attackers to escalate privileges and persist within the environment, posing a severe security risk.

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Rule sourcedetections/endpoint/petitpotam_suspicious_kerberos_tgt_request.yml

`wineventlog_security` EventCode=4768 src!="::1" TargetUserName=*$ CertThumbprint!=""
  | stats count min(_time) as firstTime max(_time) as lastTime
    BY dest, TargetUserName, src,
       action
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)`
  | `petitpotam_suspicious_kerberos_tgt_request_filter`