His best advice is probably the most obvious: "Don't ever blindly click on web links in e-mail."

To get the Snow Leopard update, click "Software Update" under your Apple menu or download it at It will quit the malware, delete persistent files, and fix any changes the Trojan may have made to config or login settings.

The update also adds a daily malware definitions check to reduce the likelihood that your Mac will get mugged by the next malware to hit the streets. If you attempt to download anything containing a Trojan horse, according to , it will flag the file and tell you to move it to the trash. This feature can be disabled by unchecking a box in your Security Preferences.