Most Important Detection – Vishing/Rogue MFA Takeover/Helpdesk-Support Impersonation 2026: AiTM Session Token Reuse Across Divergent IP/User-Agent

Ibrahim Saud@tektrix

•updated Sep 25, 2026•0•0•1

Detects anomalous authentication behavior where the same session token or identifier is utilized by multiple distinct IP addresses or User-Agent strings within a short timeframe. This behavior is indicative of Adversary-in-the-Middle (AiTM) attacks, such as those employing Evilginx, where an attacker intercepts and replays stolen session cookies to bypass standard authentication and MFA controls.