If there is a virus is very unlikely for people doing completely different things to get it. That's the first problem of your hypothesis. Furthermore, how can the virus appear in a just installed system? One way would be to infect the firmware or the recovery partition, in any of those cases how can downgrading to a prior version erase the virus? For that to happen there must be a rather big exploit and Apple wouldn't remain silent about it.It wasn't my intention to brag. I was just using a fact to illustrate a point. I could've just as easily used the OSX/Leap-A virus as an example. However, I didn't know enough about it the first place (in fact, I just googled about the history of mac virii), which is why I presented my proof-of-concept virus. Also, if you indeed have a master degree in computer science, then it should prove of good use to us here
Now, you say that virii now-a-days are "super sophisticated and run in silence". Doesn't that sound like what we might have here? I'm not saying it definitely absolutely is a virus, just the we be open to the idea that it might be.
This isn't what I've experienced. I bought a brand new 13" Macbook Pro Retina and hadn't experienced this issue until several months after, which is one of the reasons why I'm open to the idea of it being a virus.
Good idea but it makes no sense. Sorry.
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