[michalxnet]

I will guess even more. And add some drug money lets say about ~$1.3B

Two years ago:

The World Once Laughed at North Korean Cyberpower. No More.

https://www.nytimes.com/2017/10/15/world/asia/north-korea-ha...

[Scaevolus]

There's probably large-scale counterfeiting, too! https://en.wikipedia.org/wiki/Superdollar#North_Korea