SONY Hack. Some Facts

12/29/14 7:41 PM EST

FBI agents investigating the Sony Pictures hack were briefed Monday by a security firm that says its research points to laid-off Sony staff, not North Korea, as the perpetrator — another example of the continuing whodunnit blame game around the devastating attack.

Even the unprecedented decision to release details of an ongoing FBI investigation and President Barack Obama publicly blaming the hermit authoritarian regime hasn’t quieted a chorus of well-qualified skeptics who say the evidence just doesn’t add up.


Researchers from the cyber intelligence company Norse have said their own investigation into the data on the Sony attack doesn’t point to North Korea at all and instead indicates some combination of a disgruntled employee and hackers for piracy groups is at fault.

The FBI says it is standing by its conclusions, but the security community says the agency has been open and receptive to help from the private sector throughout the Sony investigation.

Norse, one of the world’s leading cyber intelligence firms, has been researching the hack since it was made public just before Thanksgiving.

Norse’s senior vice president of market development said the quickness of the FBI’s conclusion that North Korea was responsible was a red flag.

“When the FBI made the announcement so soon after the initial hack was unveiled, everyone in the [cyber] intelligence community kind of raised their eyebrows at it, because it’s really hard to pin this on anyone within days of the attack,” Kurt Stammberger said in an interview as his company briefed FBI investigators Monday afternoon.

He said the briefing was set up after his company approached the agency with its findings.

Stammberger said after the meeting the FBI was “very open and grateful for our data and assistance” but didn’t share any of its data with Norse, although that was what the company expected.

The FBI said Monday it is standing behind its assessment, adding that evidence doesn’t support any other explanations.

“The FBI has concluded the Government of North Korea is responsible for the theft and destruction of data on the network of Sony Pictures Entertainment. Attribution to North Korea is based on intelligence from the FBI, the U.S. intelligence community, DHS, foreign partners and the private sector,” a spokeswoman said in a statement. “There is no credible information to indicate that any other individual is responsible for this cyber incident.”

The spokeswoman had no comment on further inquiries about the briefing and whether the FBI found Norse’s case convincing.

A source who had been briefed on the FBI’s investigation said the agency had considered an insider as a possible explanation for the attack, but it wasn’t supported by the evidence.

The FBI won’t comment further on an open investigation, referring questions to the initial update on the investigation the agency released 10 days ago. That unusual release cited similarities between the malware and infrastructure behind the Sony attack and previous attacks attributed to North Korea as well as technical links to known North Korean-developed malware.

But many security researchers have found that evidence to be thin and unconvincing.

In addition to Norse’s analysis of Internet forums where perpetrators may have communicated and compiled dates within the malware used, a report from firm Taia Global said a linguistic analysis of the purported hacker messages points to Russian speakers rather than Korean.

Security expert Bruce Schneier called the evidence “circumstantial at best” and considered a number of other possible explanations. CloudFlare principal researcher and DefCon official Marc Rogers wrote that the FBI’s indicators seem to rely on malware that is widely available for purchase and IP addresses easily hijacked by any bad guy. Errata Security’s Robert Graham also noted the hacker underground shares plenty of code, calling the FBI’s evidence “nonsense.”

But the doubters leave open the possibility that the government has other intelligence supporting the idea that it’s North Korea that they don’t have access to, and a U.S. official told POLITICO it is likely the U.S. has access to information it is choosing not to release.

The official said law enforcement is still treating the incident as an “active criminal investigation” but that that may or may not lead to a prosecution built on evidence that goes beyond a reasonable doubt.

“I think the intent was to release the information because this is the new normal, not to tuck away information and hide it as we have in the past,” the official said, calling the quick preliminary release “unprecedented.”

Stammberger said that if there is more information out there, it should be released to companies like his and others that are also investigating the attack.

“Whenever we see some indicators or leads that North Korea may be involved, when we follow those leads, they turn out to be dead ends,” Stammberger said. “Do I think it’s likely that [officials] have a smoking gun? … We think that we would have seen key indicators by now in our investigation that would point to the North Koreans: We don’t see those data points. So if they’ve got them, they should share some of them at least with the community and make a more convincing case.”




So the FBI has come out and said it. North Korea was behind the Sony hack. With some pretty strongly worded rhetoric, they lay out exactly why they feel confident enough to lay the blame for this criminal act at the doorstep of a foreign nation.  Finally, they express their deep concern about how these events unfolded, stating that these events pose “one of the gravest national security dangers to the United States”. Pretty strong stuff. World-cyber-war One here we come.

Let’s take a look at the evidence that led the FBI to this conclusion. (At least the evidence that they were willing to share publicly).

  • Technical analysis of the data deletion malware used in this attack revealed links to other malware that the FBI knows North Korean actors previously developed. For example, there were similarities in specific lines of code, encryption algorithms, data deletion methods, and compromised networks.

So what they are saying here is that the malware found in the course of investigating the Sony hack bears “strong” similarities to malware found in other “known” malware attacks. Specifically, they are referring to the similarities between the malware found during this attack – Destover, the malware found to be at the heart of the attack against the Saudi based Aramco in 2012 – Shamoon, and the malware found at the heart of the massive cyberattack which brought most of Seoul to its knees in 2013 – Dark Seoul.

Aside from the fact that all three of these were above average cyber attacks which used a piece of malware, what exactly are the links and similarities they are referring to?

First, let’s look at each of these other attacks –

Shamoon: Was modular Windows malware discovered in August 2012 by Seculert, targeting companies in the oil and energy sectors. In particular, Shamoon was found to have infected 30,000 the Saudi arm of the oil and gas giant “Aramco”. While many speculated that Shamoon was the work of a nation state, others were not convinced. Kaspersky in particular carried out an in-depth analysis of Shamoon later that year concluding that the malware was “quick and dirty” and that the code, written by amateurs, was riddled with silly mistakes.  Shamoon was attributed to a group known as “the Cutting Sword of Justice”.

DarkSeoul: On June 25 2013, Korea suffered a series of crippling cyber-attacks that coincided with the 63rd anniversary of the start of the Korean War. The attacks were carried out by multiple actors and ranged from DDoS attacks through to incursion by malware, later identified to be “DarkSeoul”. Analysis of the “DarkSeoul” samples showed that this group had been responsible for several other high profile attacks including the devastating “Jokra” attacks against South Korean Banks and Television Broadcasters, and numerous major attacks against companies in theKorean financial sector in May 2013. Symantec attributed the attacks to a group of South Korean hackers called the “DarkSeoul gang“. They did not believe that it was the work of North Korea but suggested it was possible that The “DarkSeoul Gang” was working to the benefit of North Korea or possibly even on their payroll.

So while North Korea has certainly been hinted at for each of these two hacks, the evidence is flimsy and speculative at best. So, what about the similarities? Well, ignoring the IP addresses, as we will discuss these later, these are the “links”.


  1. Just like Shamoon, the Destover wiper drivers are commercially available EldoS RawDisk drivers.
  2. Just like Shamoon, the Destover wiper drivers are maintained in the droppers’ resource section.
  3. Just like Shamoon, the DarkSeoul wiper event included vague, encoded pseudo-political messages used to overwrite disk data and the master boot record (MBR).
  4. Just like DarkSeoul, the Destover wiper executables were compiled somewhere between 48 hours prior to the attack and the actual day of the attack. This means it is highly unlikely that the attackers spear-phished their way into large numbers of users, and highly likely that they had gained unfettered access to the entire network prior to the attack.
  5. The Shamoon components were compiled in a similarly tight time-frame prior to their deployment. The CompiledOn timestamps all fall within five days of their executables’ detonation. Nearly all were compiled on Aug 10, 2012 (between 00:17:23 and 02:46:22) and set to detonate on Aug 15, 2012. That is a tight window to quietly deploy these binaries considering that tens of thousands of machines were destroyed with this payload.
  6. In all three cases: Shamoon, DarkSeoul and Destover, the groups claiming credit for their destructive impact across entire large networks had no history or real identity of their own.  All attempted to disappear following their act, and did not make clear statements but did make bizarre and roundabout accusations of criminal conduct, and instigated their destructive acts immediately after a politically-charged event that was suggested as having been at the heart of the matter.
  7. Images from the DarkSeoul ‘Whois’ and Destover ‘GOP’ groups included a ‘Hacked by’ claim, accompanied by a “warning” and threats regarding stolen data.  Both threatened that this was only the beginning and that the group will be back. It appears that original skeletal artwork was also included in both.

While some of these similarities certainly strongly hint at a similar operation and a shared DNA between these pieces of malware, it is hardly a smoking gun. Furthermore, the strength of this particular line of analysis weakens when you consider just how much sharing happens in the malware world. Many of these pieces of malware use publicly available tools and libraries. Many of these pieces of malware are based on malware source code that has been sold/released/leaked and is therefore accessible and easy to use. Finally many of these pieces of malware are available for purchase. Indeed, the malware SaaS (software as a service) industry is booming – why write a complex piece of malware that requires specialist skills to write when it is likely to be deprecated as soon as the AntiVirus vendors record its signature. Malware SaaS operations sell wannabe malware hackers new, currently undetectable pieces of malware with a guarantee that, so long as the user pays a service charge, they will rebuild the malware to make it once again undetectable should it ever fall into the hands of the authorities.

While there is insufficient evidence to say that is what’s going on in the case of these three attacks and the malware at the heart of them, I see no effort to prove that it isn’t the case either. Lastly, it’s pretty weak in my books to claim that the newest piece of malware is the act of a nation state because other possible related pieces of malware were *rumored* to be the work of a nation state. Until someone comes up with solid evidence actually attributing one of these pieces of malware to North Korea I consider this evidence to be, at best, speculation.

  • The FBI also observed significant overlap between the infrastructure used in this attack and other malicious cyber activity the U.S. government has previously linked directly to North Korea. For example, the FBI discovered that several Internet protocol (IP) addresses associated with known North Korean infrastructure communicated with IP addresses that were hardcoded into the data deletion malware used in this attack.

What the FBI is essentially saying here is that some of the IP addresses found while analyzing the malware samples and the logs of the attack have been used in the past by North Korea. To me, this piece of evidence is perhaps the least convincing of all. IP addresses are often quite nebulous things. They are addresses of machines connected to the Internet. They are neither good, nor bad.

The IP address is never what is interesting. It’s what’s running on the system that has that IP address that is interesting. Furthermore, to imply that some addresses are permanent fixtures used by North Korean hackers implies a fundamental misunderstanding of how the internet works and in particular how hackers operate.

For starters, hackers – at least the ones that want to stay out of jail – do NOT use their own machines or websites as staging points for operations. Instead, they hijack other vulnerable systems and route their traffic through them – and often many others – as a way to hide their origin. You know IP addresses such as those belonging to hotels in Thailand for examples.

My good friend Dr Krypt3ia has done some excellent analysis on this in his latest blog:

In it, he looks at the IP addresses reference by the FBI and most importantly the systems behind them. Here is a summary of what he finds (though I urge you to go read his article in full).

  • – Thailand
  • – Poland
  • – Italy
  • – Bolivia
  • – Singapore
  • – Cyprus
  • – USA

With the exception of the US address, which appears to belong to a company based in NY, all of these appear to be addresses of known proxys open to the public. If you check these IP addresses against any of the leading IP reputation services, such as SpamHaus or Project Honeypot, you find that in fact these addresses have been used for both spam and as Command and Control (C2) addresses for malware. No North Koreans: just common garden internet cybercriminals.

The only thing that clearly we can’t examine here is whether or not the FBI has some undisclosed signals intelligence from other agencies implicating these addresses in North Korean spying operations. However, even if that were the case, I would suggest that, because of the fact that these addresses are being used by common cybercriminals as part of their regular operations, even that evidence would be tainted to some extent

  • Separately, the tools used in the SPE attack have similarities to a cyber attack in March of last year against South Korean banks and media outlets, which was carried out by North Korea.

Wait, what? They are referencing the Shamoon and DarkSeoul attacks again! You can’t use the same piece of evidence as two separate pieces of evidence!

So in conclusion, there is NOTHING here that directly implicates the North Koreans. In fact, what we have is one single set of evidence that has been stretched out into 3 separate sections, each section being cited as evidence that the other section is clear proof of North Korean involvement. As soon as you discredit one of these pieces of evidence, the whole house of cards will come tumbling down.

So where does that leave us? Well essentially it leaves us exactly where we were when we started. We don’t have any solid evidence that implicates North Korea, while at the same time we don’t have enough evidence to rule North Korea out. However, when you take into consideration the fact that the attackers, GOP, have now released a message saying that Sony can show “the Interview” after all, I find myself returning to my earlier instincts – this is the work of someone or someones with a grudge against Sony and the whole “Interview” angle was just a mixture of opportunity and “lulz”.

I am no fan of the North Korean regime. However I believe that calling out a foreign nation over a cybercrime of this magnitude – something serious enough to go to war over – should not be taken lightly. The evidence used to attribute a nation state in such a case should be solid enough that it would be both admissible and effective in a court of law. As it stands, I do not believe we are anywhere close to meeting that standard.



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