Latest Update 16/06/2017:

Security officials in the UK have claimed that the WannaCry ransomware has links to a hacking group that’s associated with North Korea. According to a report by the BBC, security officials believe that the Lazarus group launched the attack.

The group has strong links to North Korea, although it is not known who the leadership behind Lazarus is. It is not the first time the hacking organisation has been connected to the ransomware that significantly impacted the NHS.

Source: Wired.co.uk