Some how I doubt these North Korean hacking groups own any property in the U.S. which would make these sanctions more or less a PR effort:

The United States on Friday sanctioned three entities it accused of conducting cyber attacks on behalf of the North Korean government to generate revenue for the regime’s nuclear and missile programs.

The Department of the Treasury said the new measures target Lazarus Group, Bluenoroff, and Andariel, all of which are controlled by the Reconnaissance General Bureau, North Korea’s primary intelligence bureau.

Lazarus Group’s activities were widely reported after it was blamed for the 2014 cyber attack of Sony Pictures Entertainment and the 2017 WannaCry ransomware attack on countries including the U.S. and Britain.

Bluenoroff and Andariel, the Treasury said, are sub-groups of Lazarus Group.

“Treasury is taking action against North Korean hacking groups that have been perpetrating cyber attacks to support illicit weapon and missile programs,” Treasury Under Secretary for Terrorism and Financial Intelligence Sigal Mandelker said in a statement.

“We will continue to enforce existing U.S. and UN sanctions against North Korea and work with the international community to improve cybersecurity of financial networks,” she said.

The sanctions freeze all of the entities’ property and interests in the U.S., as well as those of other entities that are owned 50 percent or more by the three groups.

Yonhap

You can read more at the link.