North Korea — the Air-gapped Kingdom — has recovered from Monday's Internet outage. Most observers think the DPRK sustained a denial-of-service attack; others say the episode's consistent with a glitch. (Arbor Networks publishes a technical overview of the outage.) Speculation jumps to the conclusion (with a coy little alley-oop from the State Department) that this is part of that proportional response the President promised, but attribution here is as difficult as it is elsewhere. Besides, both Anonymous and LizardSquad quickly claimed credit for themselves. Few are convinced, but it's possible.
Count the Chinese government among the official doubters of the FBI's attribution of the Sony hack to North Korea: they're slow-rolling any cooperation with US action. There's growing suspicion that such action will be circumscribed by the President's characterization of the attack as "cybervandalism," and anyway, others ask, what could you actually do to retaliate against Kim? (War on the Rocks' serious information ops suggestion — mockery of Kim — isn't risk-free: "sending in the clowns" would provoke sad reprisals against the North Korean people.) International lawyers watch for a confirmed US response with interest. Defense intellectuals offer to school the rest of us on cyberwarfare as an asymmetric threat.
DHS releases a compendium of Destover indications of compromise for those rightly concerned about further reuse of the wiper malware. South Korea beefs up its cyber defenses, more spooked by nuclear plant hacking than the Sony affair. ICS security mavens remind us of "Aurora" and the threat to rotating machinery (like pumps and dynamos).