MACDefender

*UPDATE*

10.6.8 Snow Leopard was released to patch this!!

However Your Mac is still vulnerable MACDefender was updated as well 

It's about time! Mac's haven't had a good virus or piece of mail-ware designed for them since there creation. This has lulled many mac users into a false sense of security. Not to support viruses, but wake up and smell the coffee! No matter what operating system or computer you use, you are never %100 safe from a virus. MACDefender was disguised as an anti-virus software but really built to steal your personal information. A OS update will be coming soon which will help protect users from software such as this. Read more about MACDefender and how to remove it on the Best Tech info blog: http://www.besttechinfo.com/mac-defender-malware/