Suspicious Entra ID Device Code Flow Authentication

ATT&CK techniques

Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1528Steal Application Access Token
- T1621Multi-Factor Authentication Request Generation
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects Entra ID sign-ins performed through the OAuth device code flow which threat actors abuse in device code phishing campaigns to trick users into authorizing attacker-controlled sessions and obtain tokens for apps such as Azure AD PowerShell and the Microsoft Authentication Broker. Device code authentications with inconsistent user agent and location across a shared session are a hallmark of this phishing technique.

Reporting behind it

Related detections9 linkedT1528 — drag to rearrange

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

Suspicious GAM OAuth Token Enumeration via Process Creation

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

Suspicious OAuth Application Registration with Localhost Reply URL via Azure AD

Malicious PRT Token Forging via AADInternals (via ps_script)

Possible VMware Workspace ONE SSRF via instanceHealth hostName At-Injection (via webserver)

Suspicious AiTM Phishing Kit Session Validation Endpoint via Proxy

Suspicious Entra Device Code Authentication with Office Client and Automated User Agent

Suspicious Access to Kubernetes Service Account Token via Curl or Wget (via process_creation)

Suspicious Entra ID Device Code Flow Authentication

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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