Viruses spread without any user interaction, there have been none for OS X.
Now trojans can be spread but only by user interaction, that's why they are called trojans. There has been the QuickTime video codec thing that hijacked the DNS so web browsing got slow, but that's all it was able to manage. No data loss, no destroyed operating system. With that one you had to download and install a plug-in to supposedly be able to watch a movie from a site, and the sites get shut down quickly. It wasn't something that could spread by email, or by just going to a web page.
For the worm to take effect, the user must manually invoke it by opening the tar file and then running the disguised executable within...Two common methods of protecting against this type of Trojan horse are avoiding launching files from untrusted sources, and using a non-admin account on a daily basis.
Of course all it did was attach itself, it had no payload. Why? It's too hard to attach a good payload, the root of the system is protected, even from an admin.
Leap does not delete data, spy on the system, or take control of it, but it does have one harmful effect: due to a bug in the virus itself, an infected application will not launch. This is helpful in that it prevents people from continuing to launch the infected program unawares.
So it was only meant to attach and spread, the only reason it had a payload was because of a bug in the programming of it.
Okay, name another in the 9 years X has been out. You said viruses, you named only one, and it was wimpy.
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