Mac OS X has been devoid of any large scale viruses and Trojans for a long time now. However, of late as the popularity of Mac has grown, virus creators have started targeting the OS with new viruses. This is evident with the number of viruses and Trojans which are being written for Mac. Take for example the Fake Mac Defender Anti-Virus (removal instructions).
A recent investigation by a security group has found out that a new virus called Flashback has been infecting nearly 600,000 Macs globally. The latest variation of this virus has been targeting an unpatched Java vulnerability in Mac based PCs. The OSX Flashback Trojan connects to a remote server and downloads instructions and payload. Once the payload has been downloaded the malware will modify webpages in the web browser and try to collect personal and other information and send it back to their servers.
If you are a Mac user, the first thing you should do is apply the new patch supplied by Apple that patches this vulnerability. However, there is a chance that you might have been already infected by the Trojan.
F-secure has put up some detailed instructions on their website to find out whether you are infected by the Flashback Trojan for Mac along with instructions to remove the OSX Flashback Trojan. You can visit this page to find instructions for removing Flashback Trojan and remove it from your system.
The detection and removal instructions are targeted towards advanced users so you might want to have someone familiar with Terminal taking a look at it for you.
Also, don’t forget to apply the latest update patch supplied by Apple. To do that, open the main system menu on your Mac by clicking on the “Apple icon” and click on the item “Software update”. Once the software update has checked for updates, apply any new patch/Java update that is available for your system.
We’ll try and post more simpler detection and removal instructions for this shortly.