An Ounce of Prevention
As is always the case, taking precautions before trouble strikes is always your best protection. Make sure that you are using the latest patches and updates for your servers, gateways, e-mail clients, and security-related software. Use a firewall and/or filters to assess incoming mail attachments. Be sure to educate your users about attachments and executables, and don't forget to mention that many files can be suspect no matter what their filename extension may be or what icon is displayed.
Don't allow software defaults to rule your decisions. *Never* allow e-mail clients or browsers launch executables automatically. Be certain you know which computers on your network have Network Share turned on, or any kind of peer-to-peer capabilities enabled.
Here are some patches and software you need to be aware of:
Jim Freund is the Managing Editor of CrossNodes, where this article first appeared.