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You might think that's really cool how Microsoft gives away free anti-virus software to its users, and it is, but then you think wait a minute, Zuc.A is a Mac virus, why is it being detected by Microsoft Security Essentials, a Windows anti-virus product? Not only is Zuc.A a Mac virus it's a twenty-two years old! It was first detected in Italy in 1990! (To save you from looking it up that's when Mac System 6.0.5 was shipping.) Why was it added to Microsoft Security Essentials, and why does Chris Wysopal have a copy of it on his Windows machine?90-Days Free Avira Prime & Total Security Suite 2020 With A.I. Always-on security for always-on businesses. So that answered the question of why Chris Wysopal had a twenty-two year old copy of a Mac System 6 virus on his Windows machine, but it didn't answer the first question, why it was being detected by Microsoft Security Essentials.Kaspersky Products for Small Office Users: Kaspersky Small Office Security. It totaled a whopping 20MB, which was a lot at the time, and one of the things it contained was a collection of about twenty or so live Mac Viruses. So the fact that Microsoft Security Essentials was detecting old Mac viruses seemed to be news to Apple as well.Mac-Anti-Virus. (If you're in the security community you know who it was and since people who work at Apple prefer to stay in the shadows I won't name them.) This person had caught some of the tweets between myself and Weld Pond and wanted to know what we were seeing. I knew immediately why they wanted me to call. At the time this happened a few weeks ago I was travelling for work and didn't have time to delve into things very deeply however I received an unusual email from an old close friend who now works at Apple asking me to give them a call. ![]() I fired up an old Mac Mini with OSX I had and a Dell laptop running Windows 7 and got to scanning. Unlike Weld I don't keep copies of ancient Mac software mounted on my desktop. I have to wonder just how big the installed base of Classic Mac OS or System 6 thru 9 actually is to justify adding these signatures.But that got me thinking even more (did I mention it was a twelve hour plane ride?) If Microsoft is scanning for old Mac viruses who else is? Is this an isolated case or do all Windows AV packages scan for ancient mac viruses as well?When I got home, and unpacked and got a little more settled I searched through some of my old boxes for a CD copy of the Whacked Mac Archives. Its not a virus and it doesn't run on OSX so why detect it?Just a side note on the different Free AV product I tested. It detected both the compressed and expanded versions of 'Invisible Oasis', which was basically a simple keystroke recorder. I don't know but I suspect that the signatures that Avast uses are from compressed files and not the raw code.IAntiVirus, which is a Symantec product, failed to detect any of the known viruses but it did hit on a different file inside the Whacked Mac Archives. Why only those six? If you're going to detect ancient viruses like this why not detect them all or at least most of them? When I uncompressed the files and left them in a folder on the hard drive Avast did not detect them at all, which is the exact opposite of Sophos (See above). It only detected about six of my two dozen samples and only when compressed on the CD. Which is interesting because Avast (See below) is exactly the opposite.The Avast results are interesting. After about two hours of fighting with it I finally got it to behave nicely but it is definitely not something I would recommend.Dell Latitude D520 Intel Core2 3GB RAM Windows 7 SP1 32-bitMicrosoft Security Essentials was impressive, not only did it detect the highest number of samples it detected both the raw files and the compressed versions. Since the software is set by default to autolauch on boot it would lock up my machine instantly. It had issues installing and activating. Box and whisker plot for mac excel macrosPersonally I don't see any benefit one way or the other. Some anti-virus programs scan for really old Mac viruses and some don't. I suspect something in my testing setup may have let some of the signatures slip through otherwise there is something weird going on at Avast!So what have I actually proven here? Not a whole hell of a lot really. I'm not sure what to make of that at all. It is nice to know that they pretty much detect everything.Kaspersky's Mac product detects some of these so they definitely have some of the signatures in their library, if they have them why leave them out of the Windows version?Sophos only detected some of the files and only in their uncompressed state.Avast! seems to detect more Mac viruses on the Windows side than on the Mac side! It also detected compressed files as well as uncompressed which is a little different than what I found on the Mac side. ![]()
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