Hardening Symantec Endpoint Protection with an Application and Device Control Policy to increase security
About the FakeAV, let me share some Symantec Knowledgebase Articles:
 

Does Symantec Endpoint Protection protect me from fake anti-virus programs?

http://www.symantec.com/docs/TECH122898

SEP and Norton Network Threat Protection/IPS Signature Naming Improvements

http://www.symantec.com/docs/TECH152794

 

The latest variant was discovered on the 01/01/2012. SEP should be catching these known threats, but remember when a new varient is released, SEP will not be able to catch it until a signature is written. Notice the increase in new threats this year, there are  three in the first two weeks. As always, be sure to have the latest definitions on all your systems.

http://www.symantec.com/business/security_response/landing/azlisting.jsp?azid=T

 

 

Hope that helps!!