For more than a year, North Korean hackers have been running a ransomware operation called HolyGhost, attacking small businesses in various countries. The group has been active for quite a while but it failed to gain the notoriety and financial success of other gangs even if the operation followed the same recipe: double extortion combined with a leak site to publish the name of the victims and stolen data.
Link: Microsoft links Holy Ghost ransomware operation to North Korean hackers
via http://www.bleepingcomputer.com