The US Federal Bureau of Investigation (FBI) has issued a warning that North Korean hacking groups are targeting US cryptocurrency exchange-traded funds (ETFs).

According to the FBI, North Korean hackers are deliberately and systematically attacking the infrastructure of American cryptocurrency ETFs to steal digital assets. Criminal groups are paying special attention to finding confidential information and access to fund employees.

The FBI said the hackers use advanced social engineering techniques. In particular, the attacks include detailed pre-operational research into the profile and connections of the future victim, as well as individual scenarios designed to exploit their interests and professional responsibilities.

Attackers attempt to gain legitimate contact status through long-term, trusting interactions with their targets, use scenarios with fictitious job offers or corporate investments, and then attempt to plant malware.

To prevent unauthorized access to critical cryptocurrency ETF systems, the FBI recommends that companies use multi-factor authentication, implement strict access restrictions to sensitive information, and verify the identity of contacts through multiple channels.

Earlier, the United Nations (UN) decided to investigate the activities of hacker groups associated with the North Korean government. According to the UN, such groups stole cryptocurrency worth over $3 billion.