Anthropic Organization Member and Group Enumeration

Last updated 4 days ago on 2026-09-21
Created 9 days ago on 2026-09-16

About

Detects a single user performing at least two distinct organization discovery actions within a 10-minute window: listing users, exporting members, or viewing groups. Chaining these read actions maps membership and group structure and commonly precedes targeted role grants, invites, or data collection against high-value accounts.
Tags
Domain: GenAIPlatform: AnthropicData Source: Anthropic Audit LogsUse Case: Threat DetectionUse Case: UEBARule Type: ES|QLTactic: DiscoveryLanguage: esql
Severity
medium
Risk Score
47
MITRE ATT&CK™

Discovery (TA0007)(external, opens in a new tab or window)

False Positive Examples
Organization administrators, identity teams, and compliance reviewers may list users, export members, and view groups during audits, access reviews, or offboarding. Confirm the actor and change ticket before escalating.
License
Elastic License v2(external, opens in a new tab or window)

Definition

Integration Pack
Prebuilt Security Detection Rules
Related Integrations

anthropic(external, opens in a new tab or window)

Query
text code block:
from logs-anthropic.audit-* | where data_stream.dataset == "anthropic.audit" and event.action in ("org_members_exported", "org_users_listed", "group_list_viewed") and user.email is not null | stats Esql.event_action_count_distinct = count_distinct(event.action), Esql.event_action_values = values(event.action), Esql.event_count = count(*), Esql.event_id_values = values(event.id), Esql.source_ip_values = values(source.ip), Esql.user_agent_original_values = values(user_agent.original), Esql.anthropic_audit_actor_type_values = values(anthropic.audit.actor.type), Esql.user_id_values = values(user.id), Esql.timestamp_first_seen = min(@timestamp), Esql.timestamp_last_seen = max(@timestamp) by user.email, organization.id | where Esql.event_action_count_distinct >= 2 | keep user.email, organization.id, Esql.*

Install detection rules in Elastic Security

Detect Anthropic Organization Member and Group Enumeration in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).