sap_sensitive_rfc_function_module_execution

rule sap_sensitive_rfc_function_module_execution {

  meta:
    author = "Google Cloud Security"
    description = "Detects the execution of sensitive function modules via RFC (AUK). Targets Parameter 3 for the function module name."
    severity = "High"
    tactic = "TA0002"
    technique = "T1129"

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

    $e.additional.fields["msg_1"] = "AUK"
    $e.additional.fields["param3_1"] in %sap_sensitive_function_modules.module

    $function_module = $e.additional.fields["param3_1"]
    $user = $e.principal.user.userid

    not $user in %sap_admin_users.user

  match:
    $user, $function_module over 1h

  outcome:
    $risk_score = 75
    $target_sid = array_distinct($e.target.application)
    $function_group = array_distinct($e.additional.fields["param1_1"])
    $description = array_distinct($e.metadata.description)
    $t_code = array_distinct($e.security_result.detection_fields["slgtc_1"])

  condition:
    $e
}