I got my first copy of the virus off of Acquisition last night. Actually, it was this morning 'cause I was up til 1. Anyway, it wasn't a .sit or .dmg. It was an MP3. Acqusition showed me the supposed download of 4MB of data. It didn't even have an obvious name. I was downloading what I thought was the Diva's aria from "The Fifth Element."
Still, to be on the safe side, I didn't double click to open them. I used Quicktime's open command. I got a message saying Quicktime couldn't open it because it was in a format Quicktime didn't understand. Delving into "Get Info" I found what I didn't expect to find. I found a "Get Info" panel that looked more like one for an app than one for an MP3. It wasn't even 4MB in size. I've attached example images.
I've dumped the file. No trojans on this Mac. Ran Norton, which now has the definition for MP3Concept, and no damage done.
Thank you, common sense.
P.S. The images do not apply to the file I downloaded due to the fact that I dumped it as soon as I suspected it.