Enterprise operations increasingly rely on browsers, leading to over 80% of security incidents originating from web applications accessed via Chrome, Edge, Firefox, and other browsers. Scattered Spider (UNC3944, Octo Tempest, Muddled Libra) targets human identity and browser environments, focusing on saved credentials, calendars, and security tokens in browser tabs. The group uses precision exploitation rather than mass phishing, leveraging user trust to steal credentials and manipulate browser runtime. Techniques include Browser-in-the-Browser overlays, auto-fill extraction, session token theft that can bypass MFA, malicious extensions, and in-browser JavaScript injection. Browser security must be elevated to a primary enterprise defense control.
As enterprises continue to shift their operations to the browser, security teams face a growing set of cyber challenges. In fact, over 80% of security incidents now originate from web applications accessed via Chrome, Edge, Firefox, and other browsers. One particularly fast-evolving adversary, Scattered Spider, has made it their mission to wreak havoc on enterprises by specifically targeting sensitive data on these browsers.
Scattered Spider avoids high-volume phishing in favor of precision exploitation. This is done by leveraging users' trust in their most used daily application, stealing saved credentials, and manipulating browser runtime. Browser Tricks: Techniques like Browser-in-the-Browser (BitB) overlays and auto-fill extraction are used to steal credentials while evading detection by traditional security tools like Endpoint Detection and Response (EDR). Session Token Theft: Scattered Spider and other attackers will bypass Multi-Factor Authentication (MFA) to capture tokens and personal cookies from the browser's memory.
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