Could this be a Mac Virus or a Trojan?

Malware: OSX/flashback.A

You're sitting there minding your own business, just browsing the Web on your new MacBook Pro. Mac antivirus? Nah, you were told you don't need it. So you're at your desk or office, or wherever, and you know you've never downloaded any Adobe software. Yet, you get an "Adobe Flash Player Install Manager" out of nowhere and it says "Update Adobe Flash Player" at the top. It might even look similar to the image on the right (credit: Intego). 

As a Mac user, you're not alone. Many Mac users have found themselves in this unfamiliar, Windows-esque role unsure why an Adobe Flash Player install manager randomly popped up on their MacBook Pro.

I know, I know, you might be thinking: Do I need Antivirus for Mac?

Intego was the first to discover the Mac malware in September 2011, which they're calling the Flashback Trojan horse. Intego's Anti-Virus for Mac identifies the malware as OSX/flashback.A. Since first spotting this malware, a number of new variants surfaced in the wild; a variant discovered in October 2011 reportedly damaged some system files.

Well, so, aside from all that bad news, I've got some bad news for you. As it turns out, Intego, again, those anti-malware, Mac virus hunting, anti-phishing, Apple security experts did it again! They discovered a new variant of the Flashback Trojan horse, but this one is able to install itself on a Mac with much more limited user intervention. There is no more installer, and no request for a password. 

Dude what the flip! Antivirus for Mac, really?

It's going to be a long year. 

The Mac Security Blog further analyzed the newest variant of the Mac Flashback Trojan horse. You might consider checking out the report to mitigate any risk of having this malware installed on your Mac with no intervention on your part.