This white paper provides an in-depth technical analysis of the REvil ransomware group, one of the most prolific ransomware-as-a-service (RaaS) operations. It explains REvil’s infection vectors, including phishing, exploit kits, and supply-chain compromises, and outlines its double-extortion model combining encryption with data theft. The document details encryption routines, victim profiling, negotiation tactics, and infrastructure used for command-and-control operations. It also maps observed behaviors to MITRE ATT&CK techniques and highlights lessons learned for enterprises, emphasizing proactive detection, patch management, backup strategies, and incident response preparedness to mitigate large-scale ransomware incidents.

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