sap_security_audit_log_user_created_deleted_or_unlocked

rule sap_security_audit_log_user_created_deleted_or_unlocked {

  meta:
    author = "Google Cloud Security"
    description = "Detects when an SAP user is created, deleted, or unlocked"
    severity = "Medium"
    tactic = "TA0003"
    technique = "T1136"

  events:
    $e.metadata.log_type = "SAP_SECURITY_AUDIT"

    $e.additional.fields["msg_1"] = /^AU7$|^AU8$|^AU9$|^AUA$/ nocase

    $user = $e.principal.user.userid
    $sid = $e.target.application

    //exclusions
    not $user in %sap_admin_users.user

  match:
    $user, $sid over 59m

  outcome:
    $risk_score = 75
    $target_sid = array_distinct($sid)
    $description = array_distinct($e.metadata.description)
    $terminal = array_distinct($e.principal.hostname)
    $message_ids = array_distinct($e.additional.fields["msg_1"])
    $target_user = array_distinct($e.additional.fields["param1_1"])
    $t_code = array_distinct($e.security_result.detection_fields["slgtc_1"])
    $TXSUBCLSID = array_distinct($e.security_result.summary)
    $system = array_distinct($e.target.application)
    $instance = array_distinct($e.target.resource.name)

  condition:
    $e
}