Re: Help recover stolen bitcoins?? How did it happen?

What OS are you running?
Did you do stuff over WiFi recently?

There's a recent WiFi vulnerability. I don't know if it's related or what kind of information can leak, but have a look:
https://www.bleepingcomputer.com/news/security/list-of-firmware-and-driver-updates-for-krack-wpa2-vulnerability/

In that case, it probably is not a virus. It is probably malware.

Nowadays these are practically synonyms, and antiviruses detect both.