sap_multiple_password_changes

rule sap_multiple_password_changes {

  meta:
    author = "Google Cloud Security"
    description = "Detects multiple password changes (BU2) by a single actor or targeting a single user across systems."
    severity = "Medium"
    tactic = "TA0004"
    technique = "T1098"

  events:
    $e.metadata.product_name = "SAP security audit"

    $e.additional.fields["msg_1"] = "BU2"

    $source_user = $e.principal.user.userid
    $target_user = $e.additional.fields["param2_1"]
    $client = $e.target.resource.attribute.labels["slgmand_1"]

  match:
    $source_user over 3h

  outcome:
    $total_changes = count($e.metadata.product_log_id)
    $distinct_targets = count_distinct($target_user)
    $distinct_clients = count_distinct($client)
    $admin_email = array_distinct($e.principal.user.email_addresses)
    $target_users = array_distinct($target_user)
    $terminal_ips = array_distinct($e.principal.ip)

  condition:
    #e >= 3 or #target_user >= 3
}