In that case, it probably is not a virus. It is probably malware.
Nowadays these are practically synonyms,
No, they aren't.
In that case, it probably is not a virus. It is
and antiviruses detect both.
Anti-virus software may try to detect some malware, but it would be impossible for it to detect all malware.
This is why i dont really trust completely on anti-viruses which even if i do have AV i dont usually download random things online. Come to think off that they are just the online ones who do made viruses for the sake that they Anti-virus would sell off.(Just my own view). Regarding on op,that was a big loss 0.6 btc is already a big amount if you do see on current price of bitcoin and reversing the transaction isnt possible.Forget those coins and move on.