Anthropic Service Key Revoked

AnalysisType: rule
RuleID: Anthropic.Activity.Service.Key.Revoked
DisplayName: "Anthropic Service Key Revoked"
Enabled: true
Filename: anthropic_service_key_revoked.py
LogTypes:
  - Anthropic.Activity
Severity: Medium
Description: >
  Detects when a service key is revoked. Unauthorized revocation could
  indicate an attacker disrupting integrations or covering tracks after
  using a compromised key. The service_key_id and service_name fields
  identify which key was revoked.
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 key rotation or incident response
  2. Check if a service_key_created event occurred near this revocation to determine if this is a key rotation or a standalone revocation
  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 revoked
    ExpectedResult: true
    Log:
      {
        "id": "activity_01ABC123",
        "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",
          "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_created",
        "actor": {
          "type": "user_actor",
          "email_address": "admin@example.com",
          "user_id": "user_01ABC",
          "ip_address": "10.0.0.1"
        }
      }