Phishing-correlated SSO token reuse without fresh MFA (stolen session cookie)

Duo Tech@duotech

•updated Aug 18, 2026•19•0•27

Detects session hijacking activity characteristic of the Mirage2FA AiTM (Adversary-in-the-Middle) phishing toolkit. The rule identifies non-interactive authentication events (token reuse) that lack an MFA challenge, occurring shortly after interaction with a known malicious phishing proxy domain. It further correlates this activity with anomalous signals, such as impossible travel or the use of an unseen device/user-agent, to confirm high-fidelity malicious intent.