AWS GuardDuty Black Hole Traffic Detected

// Copyright 2023 Google LLC. Licensed under Apache-2.0.

rule aws_guardduty_black_hole_traffic_detected {

  meta:
    author = "Google Cloud Security"
    description = "Amazon GuardDuty detects an Amazon EC2 instance or a container attempting to communicate with a black hole IP address."
    rule_id = "mr_8ac55f38-9c11-4f51-89cd-c40e9b6238b3"
    rule_name = "AWS GuardDuty Black Hole Traffic Detected"
    mitre_attack_tactic = "Command and Control"
    mitre_attack_technique = "Application Layer Protocol"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1071/"
    mitre_attack_version = "v13.1"
    type = "Alert"
    data_source = "AWS GuardDuty"
    platform = "AWS"
    severity = "High"
    priority = "High"

  events:
    $guardduty.metadata.vendor_name = "AMAZON"
    $guardduty.metadata.product_name = "AWS GuardDuty"
    $guardduty.metadata.product_event_type = /BlackholeTraffic/
    //Filter out sample findings
    $guardduty.security_result.about.labels["Sample"] != "true"

  outcome:
    $risk_score = max(35)
    $mitre_attack_tactic = "Command and Control"
    $mitre_attack_technique = "Application Layer Protocol"
    $mitre_attack_technique_id = "T1071"
    $event_count = count_distinct($guardduty.metadata.id)
    $principal_ip = array_distinct($guardduty.principal.ip)
    $principal_ip_country = array_distinct($guardduty.principal.ip_geo_artifact.location.country_or_region)
    $principal_ip_state = array_distinct($guardduty.principal.ip_geo_artifact.location.state)
    $principal_user_display_name = $guardduty.principal.user.user_display_name
    $aws_region = $guardduty.target.location.name
    $target_resource_name = $guardduty.target.resource.name
    $target_resource_product_object_id = $guardduty.target.resource.product_object_id
    $security_result_summary = array_distinct($guardduty.security_result.summary)
    $security_result_description = array_distinct($guardduty.security_result.description)
    $security_result_severity = array_distinct($guardduty.security_result.severity)
    $security_result_severity_details = array_distinct($guardduty.security_result.severity_details)
    $metadata_product_event_type = array_distinct($guardduty.metadata.product_event_type)

  condition:
    $guardduty
}