In other words, you downloaded the virus from something else and it infected an innocent file like an Add-On.
This.
I've already deleted the file in my addons folder. Something tells me that a seperate executable, possibly something I recently downloaded, shoved itself into that file.
I redownloaded the 2x cube, scanned it, and got nothing. It definitely must have been another file.
EDIT: stuff, IT'S BACK. The same file, except this time it's in one of my goddamn Garry's Mod addons (Advanced Duplicator).
What is it with this file and infecting game addons?!
Well, anyway, I'm going to do a full scan of my computer to figure out where the hell this mailware is coming from. It obviously isn't someone's addon, it must have been something I downloaded - I've scanned the 2x cube about 50 times now. Same with the SVN of Advanced Duplicator, I get nothing.
So I'm sorry for the false alarm, it's my fault (At least I think it is, siblings :C) Locking.