An anonymous reader writes from a report via Softpedia: South Korea says that North Korea is behind a data breach that occurred last May, where hackers stole details about 10 million user accounts from Interpark.com, one of the country's biggest shopping portals. The hackers later tried to extort Interpark management by requesting for 3 billion won ($2.66 million / 2.39 million euros), otherwise they were going to release the data on the internet. [The hackers wanted the money transferred to their accounts as Bitcoin.] Authorities say they tracked the source of the hack to an IP in North Korea, previously used in other attacks on South Korean infrastructure. "Besides the evidence related to the IP addresses and the techniques used in the attacks, investigators also said that the emails Interpark management received, written in the Korean language, contained words and vocabulary expressions that are only used in the North," reports Softpedia.