Security experts have discovered two novel forms of Mac OS X malware.
OSX/Tored-A - an updated version of the Mac OS Tored worm - and a Trojan called OSX/Jahlav-C were both found on popular pornographic websites.
Users logging on to these sites are asked to download a "missing Video ActiveX Object" but are sent a virus payload instead.
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Sophos says that the OSX/Jahlav-C is an update to a previous version of Jahlav; it runs a script that "uses http to communicate with a remote website and download code supplied by the attacker".
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Previously, the virus would download fake anti-virus software that would dupe users into buying a product that would not actually do anything and, warned Mr Cluley, would result in hackers obtaining credit card details. However, that has changed and at present the virus is not downloading any code.
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