OpenAI ChatGPT Enterprise Domain Created

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OpenAI ChatGPT Enterprise Domain Created

Detects ChatGPT Enterprise audit events that create a workspace domain boundary entry. Domain changes can expand who is allowed to join or access the tenant and may establish persistence for attacker-controlled domains.

Rule type: esql

Rule indices: None

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Domain: GenAI
Platform: OpenAI
Data Source: OpenAI ChatGPT Enterprise
Service: OpenAI ChatGPT Enterprise
Use Case: Threat Detection
Resources: Investigation Guide
Rule Type: ES|QL
Domain: Identity
Use Case: Identity and Access Audit
Tactic: Persistence
Mitre Atlas: AML.T0125

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Triage and analysis

Investigating OpenAI ChatGPT Enterprise Domain Created

A domain was added to the workspace boundary. Domain changes can expand who is allowed to join or access the tenant.

Escalate when the domain is not corporate-owned, the change lacks approval, or invites from that domain follow quickly. Close as a false positive for documented onboarding or merger-related domain additions.

Possible investigation steps

Identify the actor and the domain value on the alert.
Validate ownership of the domain and whether a change request exists.
Search for subsequent invites, role changes, or ownership transfers involving that domain.
Review other IAM changes by the same actor in the surrounding window.

False positive analysis

Administrators add legitimate corporate domains during onboarding or merger activity when the request is approved.

Response and remediation

Remove unauthorized domains and audit subsequent invites associated with that domain.
Rotate credentials for the actor if the change appears malicious.

Setup

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Setup

This rule requires the OpenAI ChatGPT Enterprise integration to collect compliance logs into Elasticsearch.

https://www.elastic.co/docs/reference/integrations/openai_chatgpt_enterprise

Rule query

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from logs-openai_chatgpt_enterprise.audit_log-* metadata _id, _version, _index
| where
    data_stream.dataset == "openai_chatgpt_enterprise.audit_log" and
    event.action == "domain_create"
| keep
    _id, _version, _index, @timestamp, event.action, user.id, user.email, source.ip,
    openai_chatgpt_enterprise.audit_log.action_data.hostname,
    openai_chatgpt_enterprise.audit_log.action_data.domains,
    openai_chatgpt_enterprise.audit_log.action_data.domain_id,
    openai_chatgpt_enterprise.audit_log.action_privilege, data_stream.*

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Account Manipulation
- ID: T1098
- Reference URL: https://attack.mitre.org/techniques/T1098/

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