Gumblar is not a worm or self aware propagating attack, there is no one set of tools that will guarantee to protect you 100% from such attack
The best method to protect yourelf is through security awareness:-
- Run an and always updated antivirus ,antispyware & firewall
- make sure your operating system, browser as well as third party applications (Adobe acrobat, Flash,Office programs,etc..) are most updated .
- Make sure security settings for internet zone in your browser are set to High.
take a look below for a good writeup about gumblar
http://www.webpayments.ie/blog/Gumblar-What-is-it-How-to-I-remove-it-.html