Employees watch an electronic board to monitor possible ransomware cyberattacks at the Korea Internet and Security Agency in Seoul, Monday. / Yonhap



By Lee Han-soo

Shadow Brokers, a hacking group that has taken credit for the "WannaCry" ransomware attack, says it will unleash network data relating to the North Korean nuclear and missile programs in June.

The group, which became infamous after publishing leaks of hacking tools from the U.S. National Security Agency (NSA), posted Tuesday that there are more to come.

The group said it will sell the data through "TheShadowBrokers Data Dump of the Month," a subscription service it said it will launch in June. The information the group claims it will release includes hacking tools targeting mobile devices or Windows 10, and data from the worldwide SWIFT banking system code or nuclear and missile programs in Russia, Iran, China or North Korea.

The group said it will release the tools to subscribers monthly or go "dark" permanently if the "responsible party" buys the tools for an appropriate price, referring to the NSA.

The WannaCry ransomware attack on May 12 crippled tens of thousands of computer systems in nearly 150 countries, including South Korea. As of Wednesday, 14 Korean companies, including movie theater chain CGV and a bus schedule system in Asan, South Chungcheong Province, have reported attacks.

The Korea Internet & Security Agency (KISA) urged users to continue updating Windows to prevent possible attacks.