Is a contraction of browser and lock. The term is used to describe the state of the internet browser in response to certain sites where the user is unable to perform any of the actions below:

  • close the open tab or window
  • blocks access to the desktop of the system
  • stops you from navigating to another site

The term is also used in cases where malware opens a browser window for the above purposes without the user actively using the browser. The browser controls can be hidden so the user would not recognize it as such.

The objectives for this behavior can be numerous, but it in essence the threat actor wants the user to do something he normally wouldn’t have done, i.e. call a tech support scam number, pay a ransom, or install an extension. You can find more information about browser lockers in our blog post, Regaining Control Over Edge.

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