Tycoon2FA Known Infrastructure Detection
This rule detects suspicious sign-in attempts to Microsoft 365 accounts that originate from known Tycoon2FA infrastructure. It specifically looks for device code flow authentications from IP addresses and Autonomous System Numbers (ASNs) associated with Tycoon2FA, combined with indicators like unmanaged/non-compliant devices, specific user agent patterns (axios, node, undici), and particular application IDs, and an unbound sign-in token protection status. This combination of indicators suggests an attempt to hijack Microsoft 365 accounts using device code phishing.
Cortex XDR
