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Ransomware is malicious software that attempts to elicit money from the victim by placing a pop-up message on the screen until a fee is paid to remove it.

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Trojan.Ransompage, causes a pop-up message to appear on every webpage you visit and by targeting multiple browsers it prevents the victim from getting rid of it by switching from Firefox to Opera, for example

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Symantec said that the ransomware is designed to expire in 30 days so anyone who falls victim to the infection can remove it simply by setting their system clock forward one month.