Are there any viruses that affect Mac OS X?

With all the talk of viruses and Macs in the computer press recently, we thought it would be helpful for Intego, the Mac security specialist, to give a clear explanation of what types of viruses and malware are a danger for Mac OS X.

A virus is a type of malware, but not the only one. What types of viruses and malware exist that affect Mac OS X?

• MAC VIRUS: A virus is a small bit of executable code that spreads when users open infected files or applications. There are two viruses that affect Mac OS X: OSX.MachArena.A, a standard virus, and OSX/Oomp-A or Leap.A, which combines the techniques of Trojan horses, viruses and worms. While both of these are found in the wild, neither are widespread. The word "virus" is used - usually incorrectly - by the general public, and even the press, when talking about malware.
• WINDOWS VIRUS: There are so many Windows viruses and other forms of malware that it is hard to get a good estimate: figures range from several hundred thousand to more than a million. Windows viruses and malware don't affect Macs, but using Intego VirusBarrier X6 allows Mac users to make sure they don't inadvertently pass infected files on to friends and colleagues using Windows.

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