FinSpy Built to Elude Symantec, et al?

Read this article a few days ago -- http://www.nytimes.com/2012/08/31/technology/finspy-software-is-tracking-political-dissidents.html

The thing that really got my attention though was this:

 

"Its creators specifically engineered it to elude antivirus software made by Kaspersky Lab, Symantec, F-Secure and others."

Would be interested in what the Forum thinks about this.  Are we really that vulnerable??

 

Tks