(Click the image for the full ODNI report)
[Not only Russia, China, Iran, and terrorists but]"Criminals are also developing and using sophisticated cyber tools for a variety of purposes including theft, extortion, and facilitation of other criminal activities. “Ransomware,” malware that employs deception and encryption to block users from accessing their own data, has become a particularly popular tool of extortion. In 2016, criminals employing ransomware turned their focus to the medical sector, disrupting patient care and undermining public confidence in some medical institutions."
[See also Massive ransomware attack hits 99 countries (CNN Tech)]