The Russia-linked ransomware group behind some of the biggest recent cyberattacks has disappeared from the internet. According to CNBC, Reuters and The Washington Post, the websites operated by the group REvil went down in the early hours of Tuesday. Dmitri Alperovitch, former chief technology officer of the cyber firm CrowdStrike, told The Post that the group’s blog in the dark web is still reachable. However, its critical sites victims use to negotiate with the group and to receive decryption tools if they pay up are no longer available. Visitors to those websites now see a message that says “A server with the specified hostname could not be found.”