Ransomware authors continue improving file-encrypting programs and infection methods for Windows and Android. The biggest ransomware threat for Windows users is CryptoWall, a sophisticated malware program that encrypts a wide range of files and demands that victims pay a ransom in Bitcoin to recover them. The latest version of CryptoWall no longer bundles local privilege escalation exploits in its installer — or dropper — in its latest version. This suggests that the CryptoWall authors plan to rely more on Web-based drive-by download attacks to infect systems.”]
Source: https://www.csoonline.com/article/2882612/ransomware-authors-streamline-attacks-infections-rise.html