The CryptoLuck ransomware is a new strain of malware that is being distributed via the RIG-E exploit kit. The malware asks victims to pay a 2.1 Bitcoin (around $1,500) ransom within 72 hours in order to rescue the encrypted files. The ransomware is spread using a RAR SFX file which contains the crp.cfg, GoogleUpdate.exe, and goopdata.dll files, along with instructions to extract these into the %AppData%76ff folder and to silently execute GoogleUpdate.”]
Source: https://securityaffairs.co/wordpress/53516/malware/cryptoluck-ransomware.html