What we could be seeing could be a very small part of a much larger operation. We could have bricked or infected their entire infrastructure (quite literally),

What we could be seeing could be a very small part of a much larger operation. We could have bricked or infected their entire infrastructure (quite literally), and then DDoS'd it off the internet to: 1. Give the world a visible sign of response. 2. Perhaps trick the DPRK into believing this was the USA et al.'s real move.