sap suspected data exfiltration

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rule sap_suspected_data_exfiltration {

  meta:
    author = "Google Cloud Security"
    description = "Detects high-volume data downloads (AUY) from SAP to a local frontend file, potentially indicating exfiltration."
    severity = "Medium"
    tactic = "TA0010"
    technique = "T1041"

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

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

    $user = $e.principal.user.userid

  match:
    $user over 5m

  outcome:
    $event_count = count($e.metadata.product_log_id)
    $report_used = array_distinct($e.principal.process.file.names)
    $file_paths = array_distinct($e.additional.fields["param3_1"])
    $total_bytes_approx = array_distinct($e.additional.fields["param1_1"])
    $terminal_ip = array_distinct($e.principal.ip)
    $system_id = array_distinct($e.target.application)

  condition:
    $e and $event_count >= 10
}