I think the first sighting was in 2004 but it was relabeled and added to Sophos in 2005.
Given it's a Trojan, you should be able to find it and delete the file that it runs. It's not a virus.
http://forums.macrumors.com/showthread.php?t=123714 repeats:
"NO, this is a Trojan, meaning its something you downloaded or put on your system knowingly that then harmed your system. Viruses are self replicating, this is not. Viruses usually get into the system without you knowing."
Check your startup items next.
Bob

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