sap_gateway_acl_bypass_attempt

rule sap_gateway_acl_bypass_attempt {

  meta:
    author = "Google Cloud Security"
    description = "Detects rejected connections by Gateway ACLs (secinfo/reginfo), indicating an attempt to bypass network-layer security."
    severity = "Low"
    tactic = "TA0001"
    technique = "T1190"

  events:
    $e.metadata.product_name = "SAP_GATEWAY"

    $e.additional.fields["event_action"] = /secinfo|reginfo/ nocase

    $e.security_result.action = "BLOCK"

    $source_ip = $e.principal.ip

  match:
    $source_ip over 30m

  outcome:
    $risk_score = 5
    $acl_type = array_distinct($e.additional.fields["event_action"])
    $attempted_programs = array_distinct($e.target.process.file.full_path)
    $error_details = array_distinct($e.security_result.description)
    $user_context = array_distinct($e.principal.user.userid)
    $total_denials = count($e.metadata.product_log_id)

  condition:
    $e
}