Does anyone else feel that using the term "cyberwar" to describe this is an insult to anyone who has ever been through a real war? Insofar as there is a conflict between two or more parties, it is like a war. But that's the furthest that the analogy can be taken without it falling apart. Let's get some things straight: computers aren't people, DDoS attacks cause orders of magnitude less suffering than real war, and using a hyperbolic analogy leads to massive escalations of a conflict (e.g. Obama getting involved and taking an entire country offline).
I propose we replace this with a car analogy :). A bunch of people, possibly North Korean, possibly not, have gone and stolen a lot of cars and parked them in JP Morgan's car park. Now all the bankers, and their customers, can't find parking and can't get into the office. Banking and financial services have been denied. Then some guy at JP Morgan realizes that those cars all have New Jersey plates - that's where the attacks are coming from! So they go steal a bunch of other cars, drive them across the Hudson River, and use them to gridlock all the streets in Jersey City. Problem solved - there's now ample parking for Jamie Dimon's Maserati!
Except that because cars were stolen and transported interstate, the FBI now has to get involved.