GCP Multiple Service APIs Disabled

// Copyright 2024 Google LLC. Licensed under Apache-2.0.

 rule gcp_multiple_service_apis_disabled {

  meta:
    author = "Google Cloud Security"
    description = "Detect when multiple GCP Service APIs are disabled in a short period of time."
    rule_id = "mr_5a4ce357-e4da-4a4b-8cc2-ed5515f1043d"
    rule_name = "GCP Multiple Service APIs Disabled"
    mitre_attack_tactic = "Impact"
    mitre_attack_technique = "Service Stop"
    mitre_attack_url = "https://attack.mitre.org/techniques/T1489/"
    mitre_attack_version = "v14.1"
    type = "Alert"
    data_source = "GCP Cloud Audit"
    platform = "GCP"
    severity = "High"
    priority = "High"

  events:
    $gcp.metadata.event_type = "USER_RESOURCE_UPDATE_CONTENT"
    $gcp.metadata.log_type = "GCP_CLOUDAUDIT"
    $gcp.metadata.product_event_type = "google.api.serviceusage.v1.ServiceUsage.DisableService"
    $gcp.security_result.action = "ALLOW"
    $gcp.target.application = "serviceusage.googleapis.com"
    $gcp.principal.user.userid = $userid

  match:
    $userid over 1h

  outcome:
    $risk_score = max(75)
    $mitre_attack_tactic = "Impact"
    $mitre_attack_technique = "Service Stop"
    $mitre_attack_technique_id = "T1489"
    $event_count = count_distinct($gcp.metadata.id)
    $network_http_user_agent = array_distinct($gcp.network.http.user_agent)
    $principal_ip = array_distinct($gcp.principal.ip)
    $principal_ip_country = array_distinct($gcp.principal.ip_geo_artifact.location.country_or_region)
    $principal_ip_state = array_distinct($gcp.principal.ip_geo_artifact.location.state)
    $principal_user_id = array_distinct($gcp.principal.user.userid)
    $principal_user_display_name = array_distinct($gcp.principal.user.user_display_name)
    $target_resource_name = array_distinct($gcp.target.resource.name)
    $dc_target_resource_name = count_distinct($gcp.target.resource.name)

  condition:
    $gcp and $dc_target_resource_name > 5
}