This white paper from Trend Micro discusses the history and evolution of ransomware and recommends mitigation and prevention measures that enterprises can take.
"Compared with the 29 ransomware families discovered in 2015, 2016 saw this number rise 752% to reach 247 in 2016," Trend Micro reports. "And those behind the threat reportedly raked in US$1 billion, most likely a result of targeting large enterprises and organizations that did not have data backups and so resorted to paying the ransom."