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Threat Intelligence Report

Donuts and Beagles: Fake Claude site spreads backdoor

๐Ÿ“… May 17, 2026 ๐Ÿ“ฐ www.sophos.com ๐Ÿ” 0 CVE(s) referenced

A fake Claude AI website is distributing a previously undocumented backdoor called "Beagle" via malvertising, using DLL sideloading and DonutLoader to compromise victims with a sophisticated infection chain that mimics known PlugX tactics but delivers novel malware.

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