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Browser lockers (aka browlocks) are a class of online threats that prevent the victim from using the browser and demand a ransom. A locker is a fake page that dupes the user, under a fictitious pretext (loss of data, legal liability, etc.), into making a call or a money transfer, or giving out payment details. The “locking” consists of preventing the user from leaving the current tab, which displays intimidating messages, often with sound and visual effects.
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