20-20 Hindsight at the Big Top

RSA USA 2013 wrapped up last week and it had all the usual hallmarks of a modern security conference: storm troopers, casinos, free giveaways every few minutes, hawkers with headsets (much like the county fair), models in superhero costumes, attendees vying to collect the most free goodies, and of course the indispensable straight-jacketed unicycle-riding pitchmen.  The buzzwords this year included “Big Data”, “Mobile Security” and “Security Analytics”, not that there was any clear consensus about what those terms exactly meant or whether the solutions being peddled bore any resemblance to them.  For those with experience attending past conferences, it was just par for the course.

 

Outside of the circus tent, the high-profile hacks of major companies and web properties figured prominently in most presentations.  This wasn’t the usual FUD, either – even our conservative fellow researchers and technical presenters proclaimed that the bad guys had gained the upper hand, especially for the most sophisticated malware attacks from state-sponsored actors and financially-motivated cartels.  The technology put forth this year by the security industry in response was a little surprising, however.  Doubling down on the premise that “if the bad guys really want to get in, they will”, the emerging technology trend implied that it’s better to react quickly after you’re compromised rather than be under silent attack for months or even years like so many of the 2012-2013 examples have indicated.   There were over 11 different vendors that had created a behavioral sandbox (much like our ThreatScope) to examine the behavior of malware already in the environment.  There were at least 7 vendors that had created workflow tools to allow practitioners to record and investigate security events after the breach.  A few security vendors were touting their new-and-improved capabilities at repair and remediation.  One even declared that we now live in a “post-protection world.”  They all made for some fairly impressive demonstrations with all of those nifty post-breach attack details.

 

What was in short supply this year was an answer for why we were all there (in theory): “How do we stop the attacks?”  Where was the innovation around protection?   Protecting data from skilled attackers with newly crafted attacks designed to bypass existing security controls is indeed a hard enough task.  Now try adding in coverage for all the holes in emerging endpoints, mobility, and social web domains, and doing so inline, with low false positives and high performance.  Now try to figure out how to independently prove that all of this stuff works.  It’s a mammoth undertaking, and the unanimous consensus was that existing measures are not getting the job done.  Why not focus on THAT problem?

 

There were exceptions to this trend.  In addition to our own Chris Astacio’s standing-room-only talk on mass mobile attacks and Blackhole botnet dissection, Tomer Teller had some concrete insights into “Detecting the 1%” and Ed Skoutis presented CyberCity as a real-world model of how to pentest and ultimately protect infrastructure from physical attack.  There were other examples as well, but far too few.  

 

We’ve got to buck this trend and get back to basics – focus on stopping the attacks before they do harm or steal information.  True, we may never get it perfect, but we can certainly do a lot better.  It’s all well and good to put lots of 20-20 hindsight and forensics around an attack, but we would all prefer the deafening silence of a prevented attack over a decidedly louder postmortem of a successful data breach in all its glorious new detail.  

 

Honeyclient Evasion Techniques, Bible.org Case

Hot on the heels of the NBC.com hack last week, Websense® Security Labs™ researchers were alerted by SANS to another high profile website compromise on Friday: bible.org. It appears that the offending code has now been removed from the bible.org website.  

 

At first glance, this seemed to be a run-of-the-mill “compromise, redirect, exploit” chain; however, closer analysis revealed the use of an interesting Honeyclient evasion technique. Honeyclients allow the profiling of websites in a heuristic and automated way; more often, testing a website with a Honeyclient takes longer than signature-based solutions but the results are much more accurate, especially when new zero-day code or a new emerging threat needs to be flagged up and requires scrutiny. Usually, Honeyclients run on top of virtual machine sandboxes: evasion techniques allow malicious code to become more aware of its running environment and to check if it’s in a virtual environment or likely to be an ‘analysis’ environment before actually running malicious code. 

 

 

 

This snippet of code is the entirety of the Honeyclient evasion attempt – as the method name suggests, the function ‘jsstatic’ will only be called once the eventhandler registers the movement of the user’s mouse over the document (page) – obviously, a primitive Honeyclient will have no mouse movement emulation, therefore the offending function that leads to exploit code will never be called and alerted on by the Honeyclient.

 

Let’s take a closer look at the jsstatic function (click to enlarge):

 

 

The first part of this function definition is simply a sentry variable, to stop the function being executed indefinitely with each new onmousemove event – the global variable astatf is defined as 0 in an earlier part of the script. The next part simply creates the iFrame, which is then executed as if it had just been injected into the page, as per a normal compromise.

 

This technique is quite primitive and showcases the infancy of this type of Honeyclient evasion technique. The plethora of event handling methods available means this technique is not going to go away anytime soon, and is likely only going to get more complex and inventive. 

 

In summary: the use of such techniques ultimately aids malicious code in remaining undetected for longer periods of time and thus increases its chances of bypassing security products undetected. The technique described in this blog is simple and allows redirection to exploits only if a mouse movement is detected, an action that is often associated with an actual person interacting with a website and often not used by primitive Honeyclients. Why are the attackers using this technique instead of the normal drive-by type technique we usually see? probably because they wanted to make the attack more stealthy, as attacks like this wouldn’t be picked up by automated behavioral analysis systems. That’s why multiple layers of defense are needed for web-based attacks.

 

This discovery ties in to Websense Security Labs predictions that Cybercriminals will become more ‘virtually aware’ and find modern bypass methods to avoid security detection – see our Websense 2013  Security Predictions.

 

Author: Darrel Rendell 

NBC.com Compromised

Earlier today the main website of NBC and some of their show websites (such as www.jaylenosgarage.com) were compromised and served malicious content to users. The malicious content was inserted as a one-line iframe tag on one of the JavaScripts that gets loaded every time a user visits the page:

 

 

 

This one line of code forces the web browser of every visiting user to download content from the walterjeffers site, which, in turn, redirects the user to two other sites that eventually use an exploit kit to automatically install a malicious file onto the computer. During the few hours the attack was active, we saw several different URLs being used by the attackers. See the screenshot below for the sequence of events as recorded by our replay system that we have in Websense Security Labs.

 

 

 

 

Two vulnerabilities were used to compromise the user’s computer. In the above example, we can see a PDF file, but the exploit will also try Java vulnerabilities. If either is successful, a malicious binary from the Citadel family is installed on the machine. This family of malware is a so-called banking Trojan, which is designed to help the cyber criminals steal money from online banking accounts. While the file has very bad coverage from antivirus solutions according to VirusTotal, our Websense ThreatScope technology was able to see it as suspicious and provide a lot of additional details about the behavior of the file. See here for the full report.

 

Websense customers were proactively protected against the exploit code attack by our real-time analytics specifically designed to prevent exploit kits.

 

 

 

NBC has since confirmed that their site has been cleaned up, and it’s again safe to visit.