Apple (Snow Leopard) malware blocker collecting cobwebs
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Apple has not added any anti-malware signature updates to the XProtect.plist file that launched with antidotes for OSX.RSPlug.A and OSX.Iservice, two known Trojan horse programs targeting Mac OS X users.
[ SEE: Mac Attack: Porn video lures dropping DNS-changer Trojan ]
DNS-Changer Trojans are used to change the Mac's DNS server, a trick used by phishers to load fake Web pages and hijack valuable user data. They are typically distributed via social engineering tricks or within pirated software on peer-to-peer sites.
With the anti-malware function in Snow Leopard, Mac users were expecting new definitions via the Software Update utility but nothing new has been released in months.
The anti-malware blocker is useful, but somewhat rudimentary. It only scans files downloaded with a handful of applications (Safari, Mail, iChat, Firefox, Entourage, and a few other Web browsers).