The ransomware group REvil has just reappeared after going offline shortly after its attack on Kaseya over the July 4th weekend. REvil is responsible for some of the most disruptive ransomware attacks. For example, in June, REvil targeted Brazil’s JBS SA, one of the world’s largest meat suppliers. In July, REvil exploited a zero-day vulnerability in the Kaseya VSA remote management software to encrypt approximately 60 managed service providers (MSPs) and more than 1,500 of its clients. Shortly after these high-profile attacks, REvil’s online infrastructure went dark for no apparent reason.