CryptoWall Decrypter infection is promoted through hacked sites that use exploits to install this program onto your computer without your permission. Once installed is it will display false error messages and security warnings on the infected computer.
Once CryptoWall Decrypter is started it will do a fake scan on your computer that will state that there are numerous infections or problems present. It will then prompt you to remove these so-called infections or problems, but will not allow you to do so unless you first purchase the program.