This article may be expanded with text translated from the corresponding article in the Korean Wikipedia. (March 2013)
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On 20 March 2013, three South Korean television stations and a bank suffered from frozen computer terminals in a suspected act of cyberwarfare. ATMs and mobile payments were also affected. The South Korean communications watchdog raised their alert level on cyber-attacks to three on a scale of five. North Korea has been blamed for similar attacks in 2009 and 2011 and was suspected of launching this attack as well. South Korean officials linked the incident to a ChineseIP address, which increased suspicion of North Korea as "[i]ntelligence experts believe that North Korea routinely uses Chinese computer addresses to hide its cyber-attacks." 
The South Korean government asserted a Pyongyang link in the March cyber attacks, which has been denied by Pyongyang. A 50-year-old South Korean man identified as Mr. Kim is suspected to be involved in the attack.