entra_id_application_creation

 rule entra_id_application_creation {

  meta:
    author = "Google Cloud Security"
    description = "Application creation can be legitimate but aren't frequently created. Validating application creation may be appropriate to ensure rogue apps aren't being created."
    rule_id = "mr_0c137994-a9d9-4cd2-8c2d-b8a9c0f223d0"
    rule_name = "Entra ID Application Creation"
    type = "alert"
    platform = "azure"
    data_source = "azure ad audit"
    severity = "Low"
    priority = "Medium"

  events:
    $app.metadata.event_type = "SERVICE_CREATION"
    $app.metadata.product_name = "Azure AD Directory Audit"
    $app.metadata.vendor_name = "Microsoft"
    $app.metadata.product_event_type = "Add application"
    $app.security_result.action = "ALLOW"
    $app.principal.user.userid = $user

  match:
    $user over 5m

  outcome:
    $risk_score = 35
    $event_count = count_distinct($app.metadata.id)
    $principal_ip = array_distinct($app.principal.ip)
    $principal_email = array_distinct($app.principal.user.email_addresses)
    $principal_county_region = array_distinct($app.principal.ip_geo_artifact.location.country_or_region)
    $user_agent = array_distinct($app.network.http.user_agent)
    $network_session = array_distinct($app.network.session_id)
    $target_application = array_distinct($app.target.resource.name)
    $target_application_id = array_distinct($app.target.resource.product_object_id)

  condition:
    $app
}