How can I find out legitimate upgrade of Trojan?

There is much news in the world of the PC on how Macs are sustainable now a malware attack.  It's called Flashback Trojan horse, and he's apparently masquerades as a Flash player upgrade application.  The information I found on the web explains how to detect if you have her (I don't have) and reaassures us that Apple has now resolved the problem.

What I was not able to find, it's what the infection process looks like; specifically, how can I tell the difference between malware and legitimate Adobe upgrade?

In particular, when a warning message appears that says...

"Install Adobe Flash Player.app" is a

application downloaded from the internet.

Are you sure you want to open it?

How can I be sure that the product came from Adobe?

-Gil

In fact, the last of Flashback Trojan horse was Java partner.  However, you can always ensure that you get the official version of Flash by going to get.adobe.com/flashplayer

Tags: Flash Player

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