Security researchers have uncovered a new and sophisticated threat to Microsoft Office 365 users: a phishing-as-a-service toolkit dubbed “SessionShark O365 2FA/MFA.”
Promoted through cybercriminal marketplaces, SessionShark is designed to bypass Microsoft’s multi-factor authentication (MFA) protections—an alarming escalation in the ongoing battle between defenders and cyber attackers.
According to SlashNext, SessionShark operates as an adversary-in-the-middle (AiTM) attack platform, targeting Office 365 logins. Its core feature is the interception of user session cookies—the tokens that prove a user’s successful MFA login.
By stealing these tokens, attackers can hijack authenticated sessions, rendering MFA useless even if the original credentials and code have already been provided by the victim.
This mirrors tactics seen in other advanced phishing kits, such as Tycoon 2FA, elevating the potential for widescale breaches.
Clever Stealth and Anti-Detection Features
SessionShark’s promotional materials boast a comprehensive array of anti-detection technologies:
In a tactic borrowed from legitimate SaaS models, SessionShark is marketed with polished subscription packages and supposed “educational” intentions, offering customer support via Telegram.
While the developers emphasize “for ethical hacking” and “educational purposes,” all signs point to a tool built for criminal abuse.
The emergence of SessionShark underscores a dangerous trend: As phishing kits become more advanced and accessible, even organizations with strong MFA adoption face new risks.
Security teams are urged to monitor for session anomalies, educate users about phishing techniques, and consider layered defenses beyond MFA to stay ahead of evolving threats.
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