North Korean hackers are hijacking computers to mine cryptocurrencies as the regime in Pyongyang widens its hunt for cash under tougher international sanctions.

A hacking unit called Andariel seized a server at a South Korean company last summer and used it to mine about 70 Monero coins — worth about $25,000 as of Dec. 29 — according to Kwak Kyoung-ju, who leads a hacking analysis team at the South Korean government-backed Financial Security Institute.

The case underscores the increasing appetite from cyberattackers for digital currencies that are becoming a source of income for the Kim Jong Un regime. North Korea is accelerating its pursuit of cash abroad as the world tightens its stranglehold on its conventional sources of money with sanctions cutting oil supplies and other trade bans.