It is hard to say something new about Wannacry, (the ransomware itself, not the attack). But it is worth investigating how the attacker worked during last hours before the attack. It does not let us uncover the creator, but for sure makes him a little “more human”, opens up a question about his mother language, location and last hours creating the attack.

http://blog.en.elevenpaths.com/2017/06/wannacry-chronicles-messi-korean.html