Frankly, I think it really doesn't exist in the wild. I think we are seeing a concentrated spoof attack on these servers... perhaps orchestrated FUD??? I have yet to find ANYONE with a confirmed infection! I have over 200 clients with Macs... all running bare... and not one has had an infection. There should be at least two.
I have not seen one on the major news media comment sections, except the obvious trolls who don't even know how to spell Mac. . . claiming their MACs were infected, or others feigning bitterness that their $3000 and $4000 iMacs they bought to avoid virus infections were a waste of money because they are now infected and how they were going to buy a much more economical and powerful Windows 8 computer for their next computer for under $500!
What I have seen are numerous people using the Terminal commands or the now ubiquitous downloadable Flashback check programs, reporting their machines are "CLEAN!" Not even once have I seen someone post, "I ran the check and found my computer was infected!"
Here's my current take on it:
Because the only other possibility -- that the A/V community has stooped to fabricating huge, worldwide lies -- is extremely troubling. These are the people we trust our computers to, to keep them safe. WTF???!?!!!!