Reports say North Korea's Internet has suffered two additional brief outages. Their cause is unclear — DPRK IT infrastructure is brittle and impoverished, and, as Dyn notes, such outages are consistent with mundane causes like power failures.
Observers continue to debate North Korea's responsibility for the attack on Sony, but the emerging consensus hold the FBI has it about right. See Brian Krebs for a rundown of the evidence. Some think the "Guardians of Peace" had help from "LizardSquad," the skid gadflies who've infested Sony over the past year. Any official US response is still problematic — it's clear that any response should be proportional, but what counts as proportional remains obscure. North Korea remains defiant, threatening the US and boycotting UN Security Council human rights discussions.
For its part Sony will now permit "The Interview" to be screened on Christmas, and the media giant continues to wag its big-law bludgeon menacingly at those who would repeat those embarrassing corporate emails (Twitter's the current transgressor).
Many have noted the overheated descriptions of the attack ("war," "terrorism"). SINET's Rodriguez sensibly calls the attack more than cybervandalism, less than cyberwar, and possibly "tranformational." The Christian Science Monitor's Passcode joins those who reiterate warnings that a real cyberwar would probably open with a strike against power grids. (South Korea may be seeing early phases of this, as Wiper malware appears in a nuclear operator's network.)
Crimeware-as-a-service expands the unpleasant potential of the black market. Vawtrak banking malware is among the goods enabling increasingly targeted attacks.