Instead the FBI recommends better ransomware prevention, such as employee training (pay special attention to spear phishing) and technical prevention tools, along with a good business continuity plan.
See the April 2016 update here
Your First Step: Do You Have Ransomware? If So, What Kind?
Widespread ransomware viruses include: Xorist, CryptorBit,CryptoLocker, Locky (often targeted at hospitals) and Samas.
You may need a ransomware removal tool if your computer shows a threatening message such as:
· “Your computer has been infected with a virus. Click here to resolve the issue.”
· “Your computer was used to visit websites with illegal content. To unlock your computer, you must pay a $100 fine.”
· “All files on your computer have been encrypted. You must pay this ransom within 72 hours to regain access to your data.”
Microsoft has a good resource describing what ransomware looks like and ransomware removal tool. Visit here
If you think you've got ransomware, visit the official US CERT ransomware page here