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Mac OS X Trojan reported in the wild

A security vendor says it's seeing new variations of the AppleScript.THT Trojan horse on the Internet.

On Thursday, security vendor SecureMac reported seeing new variants of AppleScript.THT Trojan horse in the wild affecting users of Mac OS X 10.4 and 10.5.

The new variations exploit a vulnerability within the Apple Remote Desktop Agent, and can avoid detection by opening ports in the firewall and turning off system logging. The new Trojans can log keystrokes, take screen shots, take pictures with the Apple iSight camera, and enable file sharing, according to SecureMac.

The Trojans are using an AppleScript called ASthtv05 and/or may be bundled as an application. You must download and execute the file for your Mac OS X system to become infected.

SecureMac makes the MacScan, antispyware security software for Mac OSX.