Attackers are using a new service called DOUBLECUP that disguises malware as cached browser images to trick users into downloading dangerous loaders and remote access trojans on both Windows and macOS systems. You should be suspicious of unexpected pop-up
Read the full article: https://www.bleepingcomputer.com/news/security/new-doublecup-clickfix-service-hides-malware-in-browser-cache-images/