The latest Cryptowall ransomware update makes it harder to recover encrypted files, and also mocks the victim in a revamped ransom note. The latest update to the ransomware has begun encrypting data on victims machines, a first according to independent researcher Nathan Scott, who examined the code along with researchers from Bleeping Computer. It s unclear whether this most recent version of the crypto-ransomware is Cryptoweall 4.0, or a point release as others have labeled it. The FBI has suggested victims might want to consider just paying the ransom.
Source: https://threatpost.com/updated-cryptowall-encrypts-file-names-mocks-victims/115285/