Entra ID External Authentication Methods (EAM) Modified

Last updated 22 days ago on 2025-12-10

Created 6 months ago on 2025-07-14

About

Identifies when an external authentication method (EAM) is added or modified in Entra ID. EAM may allow adversaries to bypass multi-factor authentication (MFA) requirements, potentially leading to unauthorized access to user accounts and sensitive resources by using bring-your-own IdP (BYOIDP) methods.

Tags

Domain: CloudDomain: IdentityData Source: AzureData Source: Microsoft GraphData Source: Microsoft Graph Activity LogsUse Case: Identity and Access AuditTactic: PersistenceLanguage: kuery

Severity

medium

Risk Score

MITRE ATT&CK™

Persistence (TA0003)(external, opens in a new tab or window)

↳ Modify Authentication Process (T1556)(external, opens in a new tab or window)

License

Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type: New Terms Rule
Integration Pack: Prebuilt Security Detection Rules
Index Patterns: filebeat-*logs-azure.graphactivitylogs-*
Related Integrations: azure(external, opens in a new tab or window)
Query

✄𐘗text code block:
✄𐘗event.dataset: azure.graphactivitylogs and
    url.path: *authenticationMethodsPolicy* and
    http.request.method: "PATCH" and
    http.response.status_code: 200

Install detection rules in Elastic Security

Detect Entra ID External Authentication Methods (EAM) Modified 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).