MacDefender is a trojan, not a virus. In order to protect yourself its good to understand the differences.
http://www.reedcorner.net/guides/macvirus/ will give you a lot of information about viruses and other malware.
Mackeeper may or may not be legit, but most of the experienced people on this forum would tell you to stay away from it. There are better choices at no cost if you really want some anti virus protection. I suggest you read Thomas Reed's article and then make your decision.
Message was edited by: laverne's mom
As Mum says, it is a trojan not a virus. There are NO viruses ever discovered that can affect Apple OS X, but trojans are another matter.
The new MACDefender malware was first noted on April 30, 2011 by users of the Apple Support Communities, and was highlighted on May 2 by antivirus company Intego. If the right settings are enabled in Apple's Safari browser, MACDefender can be downloaded to a system after a user clicks a link while searching the Internet.
More details here:
However, users must still agree to install the malware after it downloads. After the ZIP file is extracted, users are presented with the "MACDefender Setup Installer," at which point they must agree to continue and provide an administrator password.
Because of the fact that users must agree to install the software and provide a password, Intego categorized the threat with MACDefender as "low."
Users on Apple's support forums advise killing active processes from the application using the Mac OS X Activity Monitor. MACDefender can then be deleted from the Applications folder by dragging it into the trash. There is also a 'MacDefenderKiller' uninstaller available here:
On May 24 Apple issued this Knowledge Base Article on how to avoid or remove the MacDefender malware:
But that does not mean it is over. On May 25, MacGuard is launched:
Further information here:
Apple released Security Update 2011-003 on May 31, 2011, which adds malware detection and removal for the "MAC Defender" scam and delivers a daily update mechanism for updating subsequent malware definitions. This is for Snow Leopard only.
The security update for Mac OS X 10.6.7 is available from Software Update or the company's Downloads page. Installing the update does not require a system reboot.
(The malware is not to be confused with MacDefender, the maker of geocaching software including GCStatistic and DTmatrix. The company noted on its site it is not affiliated with the malware.)
Malware spreads through search engines like Google via a method known as "SEO poisoning." The sites are designed to game search engine algorithms and show up when users search for certain topics.
One of the Mac users I help to support had it on her Mac.
From what I saw of it, I strongly recommend that you avoid Mac Keeper at all cost. It is a pig for resources and does absolutely nothing in return for them.
I removed it from her Mac and it started running so much better.
After reading the adverts for it, the primary market appears to be users who are either totally non-computer literate or those who recently switched over from Windows where things like this are necessary.