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North Korea makes the most sense, but at the same time, are they even technically savvy enough to pull this off? Their citizens literally don't even know the internet exists. Granted, I'm sure their higher-ups might be capable - or they could have outsourced the work - but still.
I'd imaging starting a hacking program is drastically easier and cheaper than building nuclear and intercontinental ballistic missile programs, as NK has been attempting to do for years. A lot of companies have crap cyber security, and it sounds like Sony was especially vulnerable.
Imagine this was NK. Now imagine they got their worm in dozens of other huge corporations. Now imagine they're emailing the heads of those companies and saying, "Do you want to be the next Sony? Give us $10 million every year or else." NK's GDP is just 12.38 billion (according to a quick google search), so attempting to bribe some Fortune 500 countries might actually yield a noticeable chunk of change. (South Korea's GPD, by comparison, is 1.3 trillion.)
When you consider how many billions of dollars many of the world's biggest companies are worth (http://www.forbes.com/global2000/list/), paying off the North Koreans might be nothing compared to the fallout of this kind of hacking.
North Korea and China are kind of friendly, but NK's antics sometimes piss China off. China still might have helped NK get a hacking program up and running, though. Or NK might have just built one on its own.
There have been a bunch of layoffs at Sony over the past year or two, but this is a pretty insane retribution for getting fired, especially if the person (or persons) get caught.