Is it going to steal your wallets/passwords/etc? See 1) and 2).
Nothing personal here, and I'm not gonna judge you for something rather than thank for this miner. Butttt... You're wrong here. At least half of newbie miners have 1-2 cards, which may even (ouuuch!) put w/o risers into closed standard midi-tower case. And that's the only PC they got. So, gaming daily, sleeping+mining nightly. Are you sure they got backups and lack personal data on their drives? So why are you surprised that someone got bored when he saw "blah-blah-WannaCry" associated to your file, bro? That's normal, they don't wanna cry. Uh oh, yeah you can use sandboxie and/or other techniques to isolate suspicious executable, but u need some skill for that.