More than two dozen malicious programs posing as third-party extensions for top social media sites have been downloaded some 3 million times, surreptitiously redirecting users to phishing sites, displaying advertisements, and stealing data, antivirus firm Avast reports. The cybercriminals behind the 28 third-party extensions camouflaged the malicious functionality as a variety of add-on features — such as video downloaders and direct message apps — for social media sites, including Facebook, Instagram, SoundCloud, and Vimeo.

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