in most organizations, device code authentication will be used to access common microsoft service but it may be legitimate for others. filter as needed.

Techniques

Sample rules

Azure AD Device Code Authentication

source: splunk
technicques:
- T1528
- T1566
- T1566.002

Description

The following analytic identifies Azure Device Code Phishing attacks, which can lead to Azure Account Take-Over (ATO). It leverages Azure AD SignInLogs to detect suspicious authentication requests using the device code authentication protocol. This activity is significant as it indicates potential bypassing of Multi-Factor Authentication (MFA) and Conditional Access Policies (CAPs) through phishing emails. If confirmed malicious, attackers could gain unauthorized access to Azure AD, Exchange mailboxes, and Outlook Web Application (OWA), leading to potential data breaches and unauthorized data access.

Detection logic

`azure_monitor_aad` category=SignInLogs "properties.authenticationProtocol"=deviceCode 
| rename properties.* as * 
| stats count min(_time) as firstTime max(_time) as lastTime by user src_ip, appDisplayName, userAgent 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `azure_ad_device_code_authentication_filter`