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Fake Claude AI website delivers new 'Beagle' Windows malware

Sophos said the trojanized installer uses DLL sideloading to install DonutLoader and a previously undocumented Beagle backdoor with remote command and file-transfer features.

Summary by BleepingComputer
A fake version for the Claude AI website offers a malicious Claude-Pro Relay download that pushes a previously undocumented backdoor for Windows named Beagle.

7 Articles

Criminals have attacked JDownloader's website and replaced official installation files for Windows and Linux with malware. Those who downloaded the program there on May 6th or 7th should urgently check their system. (Continue reading)

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Hackers Use Fake Claude AI Site to Infect Users With New Beagle Malware

Researchers have discovered a new malvertising campaign using a fake Claude AI website to plant a new, undocumented backdoor named Beagle on user devices.

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BleepingComputer broke the news in New York, United States on Thursday, May 7, 2026.
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