Anthropic Primary Owner Transferred

Last updated 2 days ago on 2026-09-23

Created 13 days ago on 2026-09-12

About

Primary ownership is the highest administrative authority in an Anthropic organization, covering billing, membership, and organization-wide settings. Transferring ownership to an attacker-controlled account can lock out the legitimate administrator from recovery paths that depend on the original owner. Attackers often do this after role escalation so defenders cannot reverse earlier privilege changes through normal administration.

Tags

Domain: GenAIPlatform: AnthropicData Source: Anthropic Audit LogsUse Case: Identity and Access AuditUse Case: Threat DetectionRule Type: ES|QLTactic: Privilege EscalationLanguage: esql

Severity

high

Risk Score

MITRE ATT&CK™

Privilege Escalation (TA0004)(external, opens in a new tab or window)

↳ Account Manipulation (T1098)(external, opens in a new tab or window)

False Positive Examples

Organizations transfer primary ownership during reorganizations, administrator departures, or vendor transitions. Verify both the previous and new owner with internal stakeholders before treating the event as malicious.

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

✄𐘗text code block:
✄𐘗from logs-anthropic.audit-* metadata _id, _version, _index
| where
    data_stream.dataset == "anthropic.audit" and
    mv_contains(event.category, "iam") and
    event.action == "primary_owner_transferred" and
    event.outcome == "success"
| keep _id, _version, _index, @timestamp, event.*, organization.*, user.*, source.*, user_agent.*, anthropic.audit.*, data_stream.*

Install detection rules in Elastic Security

Detect Anthropic Primary Owner Transferred 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).