The Bluekit phishing-as-a-service platform has expanded quickly and upgraded its credential-theft capability by shifting from adversary-in-the-middle methods to browser-in-the-middle attacks aimed at Microsoft logins. Netcraft identified nearly 70 live hostnames in a week and reported that Bluekit streams an attacker-controlled browser session to victims using the legitimate rrweb JavaScript library over WebSockets, letting targets interact with the real Microsoft sign-in page while attackers capture credentials and authenticated session tokens in real time.
Researchers said the approach can bypass MFA because authentication is completed inside the attacker’s browser, eliminating the browser-fingerprint mismatch often associated with reverse-proxy phishing kits such as Evilginx. Bluekit also includes anti-analysis and victim-filtering features including obfuscated JavaScript, randomized CSS filters, browser fingerprinting, WebRTC-based IP mismatch checks, fake brand-themed CAPTCHA pages, live victim monitoring, AI-assisted phishing email generation, and templates targeting major online services.

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Netcraft found that Bluekit upgraded from adversary-in-the-middle techniques to browser-in-the-middle attacks, using rrweb and WebSockets to stream an attacker-controlled browser session and steal authenticated Microsoft sessions. The reporting also notes Bluekit's anti-analysis and victim-filtering features remained active.
Netcraft reported that Bluekit expanded rapidly, with nearly 70 new hostnames identified over the past week, indicating increased operational scale of the phishing platform.
The references state that Varonis had previously documented Bluekit as a phishing-as-a-service platform offering AI-assisted phishing email generation and dozens of templates targeting major online services.
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