Tech support scammers are using iframes to lock web browsers and to trick people into calling their support hotlines posing as legitimate services to have their computers fixed after being presented with a “computer has been blocked”” alert. Crooks use browser pop-ups to display warnings saying that the computer was infected or “”blocked”” because it was hacked
Source: or various security outfits. Entering any of the involved URLs will open two pop-up windows: One that asks for user authentication and another that urges users to ask for technical support. By then the user has unknowingly entered a loop.”