Read more: https://blogs.rsa.com/browser-locked-call-this-number/A new form of browser locker has recently surfaced. Browser-lockers are websites or pop-ups that redirect the browser to a website that locks-up the browser. The user is prevented from continuing any normal operation including closing the offending browser window, opening a new page, or closing the application itself.
This new browser locker calls itself Microsoft Official Support as seen in Figure 1. Of course, this page is in no way related to or endorsed by Microsoft.