REvil is the latest ransomware to hit the world. Leo says that the exploit uses the Cassea remote management supply chain to infect thousands of MSP computers. REvil disables your AVS and deploys a fake Windows Defender app to infect and encrypt computers. So far, it's hit several grocery and convenience stores, forcing them to shut down. If stores are using Cassea, then they are advised to go offline and shut down their remote access.