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Kraken ransomware expands to Windows, Linux, and ESXi systems

Cisco Talos researchers have identified Kraken, a Russian-speaking ransomware group that emerged in early 2025 from the HelloKitty cartel, conducting big-game-hunting and double-extortion attacks. The group now targets enterprise environments with cross-platform encryptors for Windows, Linux, and VMware ESXi systems. Attacks observed in August 2025 exploited SMB vulnerabilities for initial access.

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