Chinese hackers were responsible for stealing the personal information of 35 million users of Internet portal Nate and blogging site Cyworld, police said on Thursday.
The stolen information, which included the people’s names and resident registration numbers, may be used to facilitate spam mail or voice phishing.
The Cyber Terror Response Center of the National Police Agency briefed reporters on the findings of their investigation, saying that the hackers used ALZip, a Korean file compression program, to access the data. The stolen personal information was leaked to a server that is believed to be based in China via another server in a third location. The ALZip program produced by ESTsoft is distributed free of charge and has around 14 million users.