The "recruiter" sent prospective employees coding challenges, or quizzes, so they could demonstrate their programming skills. But in reality, the coding challenges were malicious software packages and included a downloader designed to “deploy any desired program into the memory of the victim’s computer,” ESET says.

It looks like upgrade of the old post-soviet fraud when sharpers collect information, bank card credential etc. under cover of the attractive position description.
Then they use the received credentials to take a loan from the banks.

I think the soviet commie provide a lot of social engineering practices to the Kim jong Un suckers hackers.