North Korea holds an impressive army of cyber warriors, with over 3,000 sophisticated professionals. According to the claims of people who have escaped to South Korea, their main target is none other than Western infrastructure of critical value. North Koreas ultimate goal in cyber strategy is to be able to attack national infrastructure of South Korea and the United States. Most of the attacks are launched within China by the notorious Bureau 121, which is the group of hackers working under the direction of the General Bureau of Reconnaissance.”]
Source: http://securityaffairs.co/wordpress/34660/cyber-warfare-2/north-korea-target-west.html