Just a few days ago, Apple acknowledged yesterday the problems with Mac Defender and promise to release a security update soon.
Mac Defender tells users that their computer has been infected with a virus and offers to remove it if the user enter their credit card number, and pay for the full version of the program.
The security update will automatically find and remove the program and will also add a function that will warn the users if they try to install any of the "antivirus" programs.
Apple is actually confessing that there is problems with OS X.
Shortly after Apple spoke about the update, a new version of the programs was released. It is now called Mac Guard and does not require the users to type in their password when they are installing it.
Mac Guard is split into two parts, the first part is a downloader which download the second part, Mac Guard.
One way to protect yourself from Mac Guard is to unselect "Run Safe Files" in Safari.