CryptoWall ransomware variant has new defenses

CryptoWall, one of a family of malware programs that encrypts files and demands a ransom from victims, has undergone a revamp that is frustrating security researchers.At one time, CryptoWall was a second-rate successor to CryptoLocker, which largely disappeared after law enforcement shut down the Gameover Zeus botnet that was used to distribute it.Ransomware has been around for more than a decade, but cybercriminals have resurrected the scam over the last couple of years with surprising succe