Anthropic Role Granted

AnalysisType: rule
RuleID: Anthropic.Activity.Role.Granted
DisplayName: "Anthropic Role Granted"
Enabled: true
Filename: anthropic_role_granted.py
LogTypes:
  - Anthropic.Activity
Severity: Info
Description: >
  Tracks all role grants in the Anthropic organization. Currently used to
  build visibility into the role taxonomy as the log source matures. Once
  sufficient data is collected on org-level vs project-level role patterns,
  this rule can be refined to alert at higher severity for elevated roles.
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 project creation or an isolated privilege grant
  2. Check if target_id has been granted other roles in the past 7 days to identify potential privilege accumulation
  3. Check if actor:ip_address is associated with known VPN/proxy services or matches previously seen IP addresses for this actor
Tags:
  - Anthropic
  - Access Control
Reports:
  MITRE ATT&CK:
    - TA0004:T1098  # Account Manipulation
Tests:
  - Name: Role granted
    ExpectedResult: true
    Log:
      {
        "id": "activity_01ABC123",
        "created_at": "2026-05-07T13:02:42Z",
        "organization_id": "org_01XYZ",
        "type": "role_assignment_granted",
        "target_id": "user_01DEF",
        "target_type": "organization_member",
        "role": "chat_project:viewer",
        "resource_type": "chat_project",
        "resource_id": "claude_proj_01ABC",
        "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": "2026-05-07T13:02:42Z",
        "organization_id": "org_01XYZ",
        "type": "claude_chat_created",
        "actor": {
          "type": "user_actor",
          "email_address": "user@example.com",
          "user_id": "user_01DEF",
          "ip_address": "10.0.0.2"
        }
      }


# ------ paired body: anthropic_role_granted.py ------

from panther_anthropic_helpers import anthropic_actor_id, anthropic_alert_context


def rule(event):
    return event.get("type") == "role_assignment_granted"


def title(event):
    actor_email = anthropic_actor_id(event)
    role = event.get("role", "<UNKNOWN_ROLE>")
    target_id = event.get("target_id", "<UNKNOWN_TARGET>")
    return f"Anthropic: Role [{role}] granted to [{target_id}] by [{actor_email}]"


def dedup(event):
    return anthropic_actor_id(event)


def alert_context(event):
    return anthropic_alert_context(event)