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Okay good. Trojans are more or less all the same. For starts, the trojan is 90% of the time a RAT, which is a remote access trojan. This means that the trojan opens a port that your computer does not use as a backdoor, and tries to transfer information from your computer to the virus handler without your knowledge. This includes keystrokes, files, documents etc. First and foremost, I advise you not to connect your MAC to the internet until you have deleted the virus. This will protect any and all information you have.
Now John, I'm going to assume the anti-virus detects the trojan, and that's why you know about it. If it were encrypted well it would not show up on any anti-virus. The next step is removing the trojan. You must first restart your MAC computer:
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Use this guide to start your MAC in 'safe mode' which is the windows term. I am not familiar with the process but the process written on that site looks correct. After you have started your computer, run your Mac's antivirus. Since it could detect the virus in the first place, it should be able to delete the virus so long as it is not actively running on your computer. The point of starting your computer in safe mode is to prevent the virus from booting with your computer. After this, scan again to make sure no detections are found and restart your computer normally again. You should be fine.
~Ciricus