Cryptocurrency exchange Binance has announced that it has frozen $4.4 million worth of crypto assets associated with organizations from North Korea at the request of the US authorities.

The Binance Investigations team has been working with US law enforcement to stop the “illegal revenue-generating activities” of four DPRK organizations currently under sanctions, the crypto exchange explained on Twitter.

“More than a year ago, we began to take active action against these accounts,” the company said in a statement.

The US Department of the Treasury’s Office of Foreign Assets Control on May 23 announced sanctions against four entities and one individual that engaged in “cyber activities in support of the government of the Democratic People’s Republic of Korea.”

These organizations were the Pyongyang University of Automation, the information technology operator Chinyong, the Bureau of Technical Intelligence and the 110th Research Center subordinate to it.

According to the Treasury Department, Chinyong supports “thousands of highly skilled IT professionals around the world” who launder funds used to build weapons of mass destruction and ballistic missiles.

The sanctions list includes one Kim Sang Man who received $2 million in crypto for selling IT equipment to groups in China and Russia linked to North Korea.

Earlier, Sekoia analysts released a report where they reported that the North Korean hacker group BlueNoroff is attacking macOS users with malware called RustBucket.

North Korea-linked hacker groups stole $721 million in cryptocurrencies from Japanese entrepreneurs between 2017 and 2022. In the US government
considerthat cyberattacks and theft of cryptocurrencies have become the main source of income for the North Korean authorities. At least half of North Korea’s missile program is funded by cybercrime, Washington says.