There are many versions now of the encrypting "ransomware" programs. Some not only encrypt your business documents but also delete critical files from your server and stop your operations entirely! The only sound way out after infection is to restore from backup - paying the ransom is almost never recommended.
How to reduce risk
- As always, never open ANY suspicious attachments (e.g. zipped .js, .wsf or .vbs files)
- Disable Microsoft Office macros by default and never enable macros in ANY strange or unknown attachments that you receive
- Keep recent backup copies of important data in a secure place either online or offline
- Ensure that your system and applications are fully updated and patched
