Recently one of my client’s computer got the locky ransomware. It renames all the files to .locky
So again I recommend be on the lookout and beware of opening attachments. Limit user access and also disable macro unless you know what you are doing. If anything looks like an exe it is usually a virus. If it is a vbs it is likely a virus. Watch out if anything tells u to open macro unless u know what you are doing.