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Fake Claude AI website delivers new 'Beagle' Windows malware

bleepingcomputer.com·May 7, 2026

A fraudulent website mimicking the Claude AI platform has been discovered, distributing a malicious download that installs a backdoor known as Beagle on Windows systems. Researchers from Sophos warn that users could unknowingly compromise their devices by downloading from this deceptive site, which masquerades as a legitimate service for developers.

The most valuable insight for you is the identification of the 'Beagle' backdoor malware being distributed through a fake Claude AI website. This malware leverages a trojanized installer to deploy a PlugX malware chain, providing attackers with remote access to systems. As a CISO or cybersecurity professional, ensure that downloads of Claude-related products are sourced only from the official portal and monitor for the presence of 'NOVupdate' files as a potential indicator of compromise. This scenario underscores the importance of vigilance against phishing tactics and the need for secure software sourcing practices.

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