Even the title of this piece seems like propaganda and fear mongering. As humans we tend to over-react to outrageous scenarios, even if the chance of it happening is very rare. Car crashes are routine and mundane, and you're much more likely to be affected by that than North Korean bad-guy-hackers.<p>Building outside foes is an excellent way for the state to justify an increase in power.
For security questions my normal reply is it doesn't take much to cause serious disruptions. A pre-teen with the right scripts and a little information can cause great harm. A person given a little training and a little guidance can do more harm and the more they learn the more harm they can cause and the less you will be aware of their actions.
It'll just be a routing proxy that goes through NKs IP. Chances are one of their regular computers was hacked because it runs XP, their network mapped and malware and bots added everywhere. Now the hackers are using that to hide their true location.