Anthropic Service Key Created

AnalysisType: rule
RuleID: Anthropic.Activity.Service.Key.Created
DisplayName: "Anthropic Service Key Created"
Enabled: true
Filename: anthropic_service_key_created.py
LogTypes:
  - Anthropic.Activity
Severity: Medium
Description: >
  Detects when a new service key is created. Service keys provide
  programmatic access and their creation should be verified as authorized.
  The service_key_id, service_name, key_name, and scopes fields identify
  the key and its permissions.
Runbook: |
  1. Find all Anthropic.Activity events by actor:email_address in the 6 hours before and after the alert to determine if this is part of routine service account setup
  2. Check if actor:email_address has created service keys in the past 90 days to determine if this is a first-time action
  3. Check if actor:ip_address is associated with known VPN/proxy services or matches previously seen IP addresses for this actor
Tags:
  - Anthropic
  - Credential Access
Reports:
  MITRE ATT&CK:
    - TA0006:T1098.001  # Account Manipulation: Additional Cloud Credentials
Tests:
  - Name: Service key created
    ExpectedResult: true
    Log:
      {
        "id": "activity_01ABC123",
        "created_at": "2026-05-07T10:00:00Z",
        "organization_id": "org_01XYZ",
        "type": "service_key_created",
        "actor": {
          "type": "user_actor",
          "email_address": "admin@example.com",
          "user_id": "user_01ABC",
          "ip_address": "10.0.0.1",
          "user_agent": "Mozilla/5.0"
        }
      }
  - Name: Non-matching event type
    ExpectedResult: false
    Log:
      {
        "id": "activity_01DEF456",
        "created_at": "2026-05-07T10:00:00Z",
        "organization_id": "org_01XYZ",
        "type": "service_key_revoked",
        "actor": {
          "type": "user_actor",
          "email_address": "admin@example.com",
          "user_id": "user_01ABC",
          "ip_address": "10.0.0.1"
        }
      }