The Russian state-sponsored threat group APT28 is using Signal chats to target government targets in Ukraine with two previously undocumented malware families named BeardShell and SlimAgent. [...]
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source https://www.bleepingcomputer.com/news/security/apt28-hackers-use-signal-chats-to-launch-new-malware-attacks-on-ukraine/
source https://www.bleepingcomputer.com/news/security/apt28-hackers-use-signal-chats-to-launch-new-malware-attacks-on-ukraine/