Any explanation below seems more likely to me than it really was a North Korean operation (yes, pure rank speculation):
1) it was made up by Sony to make them look somehow less incompetent†,
2) it was made up by some media organization to drive clicks, or
3) the initial investigation revealed suspicious activity from IPs in/linked to North Korea--which could, among other explanations, just mean the attacker owned their boxes and launched attacks from there
† ...And boy does their image need improvement! The attackers were supposedly able to exfiltrate a rumored 100TB of extremely-sensitive corporate data before anyone noticed?! After the rootkit fiasco, the epic SOE break-in, and now this--I can't imagine anyone wants their data anywhere near Sony's networks (nor, perhaps, Sony's software anywhere near their networks).
http://www.bbc.com/news/world-asia-30283573
>>"When asked if it was involved in the attack a spokesman for the North Korean government replied: "Wait and see."
EDIT: To be clear, I am aware NK likes to look tough and can totally be taking credit for something they did not do. It's just that ominous replies like this spokesman gave makes it appear slightly less boogeyman'ish as compared to how the media loves implicating China & Russia in every cyber-attack story without bothering inform the general public about stuff like proxies.
This seems pretty flimsy, but it kind of fits with the cartoon dictator-esque image we have of North Korea's leadership.
Pattern matching can go wrong in all sorts of interesting ways! :)
It's kind of a fascinating look at how data is clumsily handled within corporations. I mean, how do they keep everything synced between the sheets that contain salaries/benefits, severance actions, etc.? (shudder)
Also, the Reddit thread which seems to have started the media firestorm was entitled, "I used to work for Sony Pictures. My friend still works there and sent me this. It's on every computer all over Sony Pictures nationwide." [2] (refers to this picture: https://imgur.com/qXNgFVz).
This leads me to believe that the attacker compromised most/all corporate desktops and exfiltrated data directly from those machines. No better place to get that spreadsheet than directly from the workstation of the employee who works on it daily!
[1]: http://www.bloomberg.com/news/2014-11-24/sony-corp-computers... [2]: https://www.reddit.com/r/hacking/comments/2n9zhv/i_used_to_w...
From my years working with at&t's payroll system, Export-to-csv out of SAP(www.sap.com) to be manually looked at and/or imported into some other program was very common. If at&t were the target of this whole mess, I'd assume the Windows 2000 machines running crystal reports(www.crystalreports.com/) got compromised; which would generate very sensitive payroll files.
Email, of course!
[0] http://en.wikipedia.org/wiki/Sony_BMG_copy_protection_rootki...
It raises the question though, what would it take for a company with a reputation as tarnished as Sony's to earn back your respect and patronage?
For me, the answer to that is not only maintaining a history of not attacking your customers (rootkit in CDs), but would also require an established track record of going above and beyond what other companies do to respect customer privacy.
Purely as a thought experiment, what would it take for you to reevaluate your stance on Sony?
The leaked data so far is in a 35 gig multipart rar. The list of files only(No directories or metadata) is 400meg -> 1 gig uncompressed. Both are on PB.
The NK angle seems to be there was Korean comments in the malware. But there's also a theory it was insiders angry about the restructure.
The hackers were using the Sony PlayStation network to seed these latest torrents. IE they still had some control days later.
This sort of thing is pretty hard to stop. Security kills productivity, you won't be rewarded for lowing output with no proof you didn't anything useful, that's the nature of the issue.
Limits on stolen data in the old days was more about getting it out, not security. With the huge pipes in and out these days this will become more common. The only thing stopping people doing this everywhere currently is they can't be bothered.
[edit] This is also a good lesson on why you should never put anything in writing you don't want everyone to know.
Could have stopped there. This is just a list of a couple of key points in the data with pretty banal reactions. And if it's the most interesting parts of the data then it's not all that exciting.
Just feels like someone wanted to strike while the iron was hot.
I think a thorough analysis of this is going to take a while.
Here's an archive of it https://archive.today/wqbRP