REvil is a notorious ransomware group that emerged in 2019, known for targeting businesses and organizations worldwide. They encrypt victims' data and demand a ransom for its release, often threatening to leak sensitive information if the ransom is not paid. The group gained significant attention for high-profile attacks, including those on Kaseya and JBS Foods. REvil operates on a ransomware-as-a-service model, allowing affiliates to use their software in exchange for a share of the profits. This decentralized approach has made it challenging for law enforcement to track and dismantle the group.