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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. Sophos and Kaspersky Anti-Virus would only detect viruses in their uncompressed state. Mac Mini 2GHz Intel Core 2 Duo 4GB RAM OSX 10.6.8
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I fired up an old Mac Mini with OSX I had and a Dell laptop running Windows 7 and got to scanning.
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Unlike Weld I don't keep copies of ancient Mac software mounted on my desktop. 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.
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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.īut 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? Of course the reason that most AV companies will give you for why they scan for viruses that can't possibly hurt your machine is so that you won't unknowingly infect someone else. By increasing the number of signatures they scan for, even if those signatures are technically irrelevant, they can say "We now have a squirrelzillon signatures in our product". There was of course the obvious reason why any Windows anti-virus product would scan for ancient Mac viruses would be to pad the numbers. Unfortunately like I said I was travelling and didn't have time to really look into this but I did have time to think about it, twelve hour plane trips will do that for you. So the fact that Microsoft Security Essentials was detecting old Mac viruses seemed to be news to Apple as well.
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(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. 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.Īt 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. 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. Now the Whacked Mac Archives is an interesting piece of history as it was the first and largest (at the time) repository of Macintosh Security software. The second question was easy to answer I tweeted back at Weld Pond and asked him, "huh?" He mentioned that he keeps a copy of my old Whacked Mac Archives mounted on a back up drive.
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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? A few weeks ago I caught a tweet from Chris Wysopal noticing how the new version of Microsoft Security Essentials had detected the Zuc.A virus on his machine.