initial trojan exploit..
ymantec Definitions version released 101024p today
http://www.symantec.com/business/security_response/definitions/rapidrelease/index.jsp
Sophos Protection available since 23rd October
Site explaining Trojan/ worm http://blog.threatexpert.com/2008/10/gimmiva-exploits-zero-day-vulnerability.html
worm won't be far behind......