Emsisofts malware research team has received numerous reports of a new file encrypting ransomware strain. This new family of ransomware is commonly referred to as CryptoLocker or Trojan:Win32/Crilock. The infection is mainly spread via social engineering techniques. Once the system is infected, the malware tries to establish a connection with its command and control server. The malware has two possible ways to contact its master: First by contacting the hardcoded IP 184.164.136.134, which has since been taken down.”]
Source: https://blog.emsisoft.com/en/1615/cryptolocker-a-new-ransomware-variant/