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I think it's important people should also realise that a virus check has no guarantee to find a virus - so if you do grab some software from somewhere and it passes your virus program check, that doesn't mean it doesn't have a virus.
Virus checkers only check for known viruses, so if someone makes a download and writes a new as yet unknown virus to put in it, it's possible to pass any virus program checks.
Also be aware - related to the above - that there are Windows viruses that do in fact change your pool settings in any miners they can find and point your miners to mining for someone else.
While standard manufacturer S9s so not allow this virus to affect your miners, a program like awesome miner has the standard option to allow such viruses to get into your miners.
It helps to watch which processes are running. If there is something out of the ordinary, one can research if a proggie is running which is not supposed to be running.