In VRT's rule release:
As a result of ongoing research, the Sourcefire VRT has added and
modified multiple rules in the botnet-cnc, deleted, exploit, misc,
netbios, policy, rpc, smtp, specific-threats, web-activex, web-client
and web-misc rule sets to provide coverage for emerging threats from
these technologies.
In order to subscribe now to the VRT's newest rule detection functionality, you can subscribe for as low as $29 US dollars a year for personal users, be sure and see our business pricing as well at http://www.snort.org/store. Make sure and stay up to date to catch the most emerging threats!