Suspicious Device Code Authentication via Microsoft Authentication Broker

ATT&CK techniques

Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1528Steal Application Access Token
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects device code authentication requests targeting the Microsoft Authentication Broker application, identified by its client identifier 29d9ed98-a469-4536-ade2-f981bc1d605e, which attackers abuse to obtain a Primary Refresh Token during device code phishing. A stolen PRT provides broad, durable access to the victim tenant. This combination is a high-confidence indicator of an OAuth device code phishing attack.

Reporting behind it

Related detections9 linkedT1528 — drag to rearrange

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Malicious OAuth Application Granted Full Mailbox and EWS Permissions (via m365)

Suspicious GAM OAuth Token Enumeration via Process Creation

Suspicious Entra ID Device Code Flow Authentication

Suspicious Delegated Permission Grant to Entra Agent Access Scope via Azure Audit Logs

Suspicious OAuth Application Registration with Localhost Reply URL via Azure AD

Suspicious Device Code Authentication via Microsoft Authentication Broker

Pivot detection · T1528 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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