Cryptowall 3.0, a new type of ransomware, is adept at screen locker technique. It is a kind of malware utilized by Internet frauds to extort money. Cryptowall 3.0 can sneak into a computer via a variety of vicious ways. The industry-leading XOR encryption is the main means for Cryptowall 3.0 to attack the computer systems, which can forcibly encrypt personal files stored on a computer such as sensitive videos, photos, documents and so on.