ARToken: Entra Sign-in via Device Code Authentication Protocol
This rule identifies successful OAuth 2.0 device code authentication attempts originating from both an IP address and country not previously seen for that specific user, using a 90-day baseline that requires at least 5 prior non-device-code sign-ins to be established (reducing noise from sparse-history/new accounts). It excludes known legitimate device-code applications (e.g., Azure CLI, Azure PowerShell, Visual Studio, VS Code) and sign-ins from devices already marked compliant/managed. This tightened logic reduces false positives from routine travel or home/office network changes while still catching device code phishing, where an adversary tricks a user into entering a device code on a malicious site to obtain an access token.
Microsoft Sentinel (KQL)
