An unknown group of hackers has been using sophisticated computer code to infiltrate computer networks in South Korea with the goal of uncovering the nation's military secrets, as well as those of its ally, the U.S. According to security researchers, the malware -- which has been in use since at least 2009 and is being blamed on North Korea -- is designed to scour secure networks for keywords such as the names of individuals, weapons systems and base locations and was used to infiltrate a social media site used by the South Korean military.

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