VantaCore

VantaCore is a ransomware group believed to be a rebrand of Thor, targeting Russian organizations with custom-built malware and multimillion-dollar ransom demands. F6 says the group has attacked at least seven victims, uses a ransomware-as-a-service model, and reflects a broader shift among pro-Ukrainian hackers toward in-house tooling instead of LockBit 3 Black and Babuk.