In light of the MacDefender (a.k.a. MacProtector, MacSecurity) malware issue plaguing the Mac, Apple has stated that a fix for this problem is coming soon. In a new (May 24, 2011) article on the Apple Support website called How to avoid or remove Mac Defender malware, a small paragraph makes the statement:
In the coming days, Apple will deliver a Mac OS X software update that will automatically find and remove Mac Defender malware and its known variants. The update will also help protect users by providing an explicit warning if they download this malware.
If you're having issues with these particular malware (MacDefender, MacSecurity, etc.) refer to the Apple support page for avoiding and removing malware. The article is comprehensive and explains every step clearly and concisely. The current OS versions that are affected range from Mac OS X 10.4 - 10.6. And remember to be careful when installing/uninstalling certain programs and other internet and browser related software.
Source(s): Apple, Cult of Mac