Operation Troy Incident 1 : South Korea was hit by a major cyberattack on March 20 , 2013 , at 2:00 pm local time . This cyberattack caused a significant amount of damage to the affected organizations by wiping the hard drives of tens of thousands of computers . Analysis of this attackknown first as Dark Seoul and now as Operation Troyhas revealed that in addition to the data losses of the MBR wiping , the incident was more than cybervandalism . The attacks on South Korean targets were actually the conclusion of a covert espionage campaign . ;