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As part of the campaign, the attackers have been using adversary-in-the-middle (AiTM) phishing sites to steal credentials, and have been hijacking sign-in sessions to bypass authentication even with multifactor authentication (MFA) enabled.
AiTM is a phishing technique in which the attackers deploy a proxy webserver between the user and the site they are trying to sign in to, to intercept the user’s credentials and their session cookie, which enables the user to remain authenticated to the site.