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Pro-Ukraine hacker group VantaCore is targeting Russian organizations with custom ransomware and multimillion-dollar demands. Russian cybersecurity firm F6 linked VantaCore to Thor, a pro-Ukrainian group behind 12 attacks in 2025. VantaCore operates ransomware-as-a-service with custom tools like VantaCoreLoader, VantaCoreRAT, and SnowKiller.
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