North Korean hackers, responsible for committing some of the biggest attacks on cryptocurrency entities over the years, have now set their sights on U.S.-based exchange-traded funds associated with Bitcoin and Ethereum, according to an FBI warning.

What Happened: In a public service announcement dated Sept. 3, the FBI alerted that cybercriminals from the Kim Jong Un-ruled nation have carried out research “on a variety of targets” connected to cryptocurrency ETFs over several months.