Seoul’s National Intelligence Service (NIS) issued an advisory on Thursday warning that North Korean hackers are exploiting vulnerabilities in a financial security certificate software installed on over 10 million systems in South Korea and abroad.

The press release stated that the NIS, the Korea Internet and Security Agency, and the National Security Research Institute confirmed at the end of last year that North Korea hacked some 210 computers across around 60 major domestic and foreign organizations, including defense companies.