Your computer was infected by some type of crypto ransoware.
VERY IMPORTANT: if ransomware process is running then dont kill him OTHERWISE you will lose files forever.
ENCRYPTION keys to end of encryption are stored only in RAM. if you kill the process you will kill keys too.
If proces was ended then keys are on /coronavirus as AES_encrypted_keys.txt Please be patients or say goodbaye to files.
We finded two other yours server too. If you shutdown them off then you will lose them files too.