"This distribution component reads the client's user agent in order to discern the operating system, and then serves up a malicious application designed for that operating system," said Hamish O'Dea and Tareq Saade on the MMPC blog. On Tuesday, engineers who work for the Microsoft Malware Protection Center (MMPC) said that users who visit a Web page posing as a free online virus scanner get served either Mac or Windows scareware.
The bogus program is believed to be the first security software scam on the Mac. Mac users have reported being duped into downloading the fake software on Apple 's support forums and increasing numbers to Mac-centric antivirus vendor Intego, which has identified at least three names for the same product: MacDefender, MacSecurity and MacProtector. To get rid of the program's alerts - and the occasional pornographic page that pops up in the browser, a new twist intended to make victims think their computers have been hijacked - many Mac owners pay the $79.50 "registration fee" for the worthless program.
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