Entra ID OAuth Device Code Grant by Microsoft Authentication Broker

Last updated 22 days ago on 2025-12-10

Created 2 years ago on 2024-06-24

About

Identifies device code authentication with an Azure broker client for Entra ID. Adversaries abuse Primary Refresh Tokens (PRTs) to bypass multi-factor authentication (MFA) and gain unauthorized access to Azure resources. PRTs are used in Conditional Access policies to enforce device-based controls. Compromising PRTs allows attackers to bypass these policies and gain unauthorized access. This rule detects successful sign-ins using device code authentication with the Entra ID broker client application ID (29d9ed98-a469-4536-ade2-f981bc1d605e).

Tags

Domain: CloudData Source: AzureData Source: Microsoft Entra IDUse Case: Identity and Access AuditTactic: Initial AccessLanguage: kuery

Severity

medium

Risk Score

MITRE ATT&CK™

Initial Access (TA0001)(external, opens in a new tab or window)

↳ Phishing (T1566)(external, opens in a new tab or window)

↳ Valid Accounts (T1078)(external, opens in a new tab or window)

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ Use Alternate Authentication Material (T1550)(external, opens in a new tab or window)

License

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

Definition

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

✄𐘗text code block:
✄𐘗 event.dataset:(azure.activitylogs or azure.signinlogs)
    and azure.signinlogs.properties.authentication_protocol:deviceCode
    and azure.signinlogs.properties.conditional_access_audiences.application_id:29d9ed98-a469-4536-ade2-f981bc1d605e
    and event.outcome:success or (
        azure.activitylogs.properties.appId:29d9ed98-a469-4536-ade2-f981bc1d605e
        and azure.activitylogs.properties.authentication_protocol:deviceCode)

Install detection rules in Elastic Security

Detect Entra ID OAuth Device Code Grant by Microsoft Authentication Broker 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).