I recommend you to disable Java on your browser if you don't need it.
This is the first time i heard about this kind of virus or malware. But it doesn't make any sense to me. Hacking someone's computer just to do mining. Anyway, its still a virus that should be deleted. You're still lucky tho. You haven't lost any important infos. In your wife's computer. Good thing you have an antivirus that blocks virus on your wife's pc.
This is not new, someone else's hardware is much cheaper than mining with the best ASIC hardware and the cheapest energy ever.