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I have a Windows 7 partition on my MBP that I installed with Boot Camp. I have reason to believe that there was a virus on my Windows 7 partition (did some scans, got some sketchy results from Avira). I decided to just wipe the entire partition using Boot Camp Restore to reformat the old partition and add it back to my OS X partition. I'm wondering however if in the time period I had the two partitions up a virus could have jumped from the Windows 7 partition onto the OS X partition, in which case I now need to worry about a virus on my OS X installation?

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When you boot Windows, can you access the OSX partition? See the files on their? If not, then neither can the virus. – Paul Apr 14 '12 at 22:54
well, now it's too late to tell :). i think i left it as the default. is the default read only? i read this but it doesn't look definite: – sepiroth Apr 14 '12 at 22:55
up vote 2 down vote accepted

Even if the virus was able to make its way into the OSX partition (which is unlikely), its code would in no way be able to be actually executed under such a different operating system, unless it was specifically designed for this (which is highly unlikely).

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This is a better answer. – surfasb Apr 14 '12 at 23:38

The virus needs to be able to access the HFS+ partition on which OS X is installed. If you do not have software that permits access to such partitions on Windows (such as Paragon HFS+ For Windows [no affiliation]), it should not be possible for the virus to end up on the OS X partition.

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would such software come installed default on Windows 7? or would i needed to have downloaded it from a third party? – sepiroth Apr 14 '12 at 22:59
No. Windows does not come with any support for HFS+ partitions. – bwDraco Apr 14 '12 at 23:00

Well, let's say, a virus/worm spreading from one platform/OS to another is quite unlikely.

However the comments here, saying it would be impossible, are simply wrong. It is perfectly possible to equip malware with the ability to operate cross-platform. Neither different binary formats nor file systems are insurmountable barriers. It's just adding extra effort in the development phase.

And that is pretty much the point, it is probably not actually worth the effort for a malware author to implement that.

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