What is CryptoWall 4.0
Cryptowall is a encryption based ransomware.
As per Bitdfender this ransomware is using AES 256 encryption algorithm and its key is encryptied with RSA 2048.
They found that its server is located in Russia.
And Russian users are safe as if it detect Russian as keyboard language then it skip its encryption process.
According to Bitdefender alone in US Cryptowall 3.0 did the $325 million of damage.
It spreads by spam emails and drive-by-attacks.
Because the most dangerous and damaging antiransomware is cryptowall so it is also known as Anti CryptoWall.
Now bitdefender released the latest version of its Anti-Ransomware tool with protection fromCTB-Locker,LockyandTeslaCryptFamily Ransomware.
So they called it a vaccine.
You have nothing to do much.
In this case there are two options