Here's an indictment from 2019 for similar activities. It's a crime in the U.S., thus prosecutable in the U.S. The question is whether Swiss authorities cooperate, not the jurisdiction.
https://www.justice.gov/usao-wdwa/pr/swiss-hacker-indicted-c...
https://www.justice.gov/usao-wdwa/pr/swiss-hacker-indicted-c...
In fact I don't think any countries will extradite you to North Korea. There's plenty (including many in the neighborhood of Switzerland) that extradite to the US for at least some crimes.