Tech support scammers have been relying on fraudulent pop-ups for many years in order to scare potential victims into calling for remote assistance. These so-called browser lockers (or browlocks) typically originate from malicious ads (malvertising) that can appear on any website, including trusted online portals.
The purpose of browser lockers is not only to scare but also to create the illusion that the computer has been locked, which is not quite true. What’s happened is simply that the browser is stuck in between a flurry of alert dialogs that won’t seem to go away, no matter how many times they are clicked on.
Google Chrome is often the most-targeted browser because of its dominant market share, but pop-ups come in as many different flavors as browser types, with landing pages specific to those browsers. For example, a particularly vicious technique abused the history.pushState HTML5 API to literally freeze machines while displaying the fake pop-up.
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