REvil is one of the most infamous ransomware gangs active today. It operates a ransomware-as-a-service (RaaS) business model: its malware platform is used by its own hackers for some attacks, while others are conducted by affiliates on a revenue-sharing basis. Numerous high-profile attacks have been attributed to REvil, especially in 2021, although its days maybe numbered, as at least some of its major operatives have been arrested by law enforcement in various countries.
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