Attention please! A new version of previous Mac Flashback Trojan which was first discovered in September is using Java flaws to infect Macs with limited user's interference.

Once active Trojan starts to disable the Mac’s security software and installs a dynamic loader library and auto-launch code which allows it in inject code into programs users are loading. The mentioned code sends all information about infected Mac to remote server.

This version of Mac's Trojan explores two Java vulnerabilities that help entering the system without user's intervention. It should be mentioned that the patch of Java for Mac OS X was issued and helped to fix these security holes.

To check if you are infected with the BackDoor.Flashback.39 trojan you can use a simple free utility created by jils.

The utility can be downloaded from here. Simply run the application and click the Check for Flashback Infection button.

Over 600,000 Macs are said to have been infected with the trojan. Make sure to run Software Update and install the latest Java security patch which will close the exploit.