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Posts Tagged ‘Remote Administration Tool’

Back to The Future of Stuxnet

October 19, 2011 4 comments

While the U.S. and U.K. are debating whether to use Cyberwarfare, someone, somewhere, has decided not to waste further time and has anticipated them, developing what appears to be a precursor of Stuxnet 2.0. In a blog post, Symantec explains how it came across the first samples of the malware thanks to a research lab with strong international connections, which, on October 14 2011, alerted the security firm to a sample that appeared to be very similar to Stuxnet.

The brand new threat has been dubbed “Duqu” [dyü-kyü] because it creates files with the file name prefix “~DQ”, and has been discovered in some computer systems located in the Old Continent. After receiving and analyzing the samples, Symantec has been able to confirm that parts of Duqu are nearly identical to Stuxnet, but with a completely different purpose.

Unlike its infamous predecessor Duqu does not target ICS but rather appears to be a RAT developed from the Stuxnet Source Code, whose main features may be summarized as follows (a detailed report is available here):

  • The executables [...] appear to have been developed since the last Stuxnet file was recovered.
  • The executables are designed to capture information such as keystrokes and system information.
  • Current analysis shows no code related to industrial control systems, exploits, or self-replication.
  • The executables have been found in a limited number of organizations, including those involved in the manufacturing of industrial control systems.
  • The exfiltrated data may be used to enable a future Stuxnet-like attack.
  • Two variants were recovered [...], the first recording of one of the binaries was on September 1, 2011. However, based on file compile times, attacks using these variants may have been conducted as early as December 2010.

Of course this event rises inevitably many security questions: although cyberwar is actually little more than a concept, cyber weapons are a consolidated reality, besides it is not clear if Duqu has been developed by the same authors of Stuxnet, or worst by someone else with access to the source code of the cyber biblical plague (and who knows how many other fingers in this moment will be coding new threats from the same source code).

Anyway one particular is really intriguing: only yesterday the DHS issued a Bulletin warning about Anonymous Threat to Industrial Control Systems (ICS), not event 24 hours after the statement a new (potential) threat for ICS appears in the wild… Only a coincidence?

Advanced Persistent Threats and Security Information Management

October 13, 2011 3 comments

Advanced Persistent Threats are probably the most remarkable events for Information Security in 2011 since they are redefining the infosec landscape from both technology and market perspective.

I consider the recent shopping in the SIEM arena made by IBM and McAfee a sign of the times and a demonstration of this trend. This is not a coincidence: as a matter of fact the only way to stop an APT before it reaches its goal (the Organization data), is an accurate analysis and correlation of data collected by security devices. An APT attack deploys different stages with different tactics, different techniques and different timeframes, which moreover affect different portion of the infrastructure. As a consequence an holistic view and an holistic information management are needed in order to correlate pieces of information spread in different pieces of the networks and collected by different, somewhat heterogeneous and apparently unrelated, security devices.

Consider for instance the typical cycle of an attack carried on by an APT:

Of course the picture does not take into consideration the user, which is the greatest vulnerability (but unfortunately an user does not generate logs except in a verbal format not so easy to analyze for a SIEM). Moreover the model should be multiplied for the numbers of victims since it is “unlikely” that such a similar attack could be performed on a single user at a time.

At the end, however, it is clear that an APT affects different components of the information security infrastructure at different times with different threat vectors:

  • Usually stage 1 of an APT attack involves a spear phishing E-mail containing appealing subject and argument, and a malicious payload in form of an attachment or a link. In both cases the Email AV or Antispam are impacted in the ingress stream (and should be supposed to detect the attack, am I naive if I suggest that a DNS lookup could have avoided attacks like this?). The impacted security device produce some logs (even if they are not straightforward to detect if the malicious E-mail has not been detected as a possible threat or also has been detected with a low confidence threshold). In this stage of the attack the time interval between the receipt of the e-mail and its reading can take from few minutes up to several hours.
  • The following stage involves user interaction. Unfortunately there is no human firewall so far (it is something we are working on) but user education (a very rare gift). As a consequence the victim is lured to follow the malicious link or click on the malicious attachment. In the first scenario the user is directed to a compromised (or crafted) web site where he downloads and installs a malware (or also insert some credentials which are used to steal his identity for instance for a remote access login). In the second scenario the user clicks on the attached file that exploits a 0-day vulnerability to install a Remote Administration Tool. The interval between reading the malicious email and installing the RAT takes likely several seconds. In any case Endpoint Security Tools may help to avoid surfing to malicious site or, if leveraging behavioral analysis, to detect anomalous pattern from an application (a 0-day is always a 0-day and often they are released after making reasonably sure not to be detected by traditional AV). Hopefully In both cases some suspicious logs are generated by the endpoint.
  • RAT Control is the following stage: after installation the malware uses the HTTP protocol to fetch commands from a remote C&C Server. Of course the malicious traffic is forged so that it may be hidden inside legitimate traffic. In any case the traffic pass through Firewalls and NIDS at the perimeter (matching allowed rules on the traffic). In this case both kind of devices should be supposed to produce related logs;
  • Once in full control of the Attacker, the compromised machine is used as a hop for the attacker to reach other hosts (now he is inside) or also to sweep the internal network looking for the target data. In this case a NIDS/anomaly detector should be able to detect the attack, monitoring, for instance, the number of attempted authentications or wrong logins: that is the way in which Lockheed Martin prevented an attack perpetrated by mean of compromised RSA seeds, and also, during the infamous breach, RSA detected the attack using a technology of anomaly detection Netwitness, acquired by EMC, its parent company immediately after the event.

At this point should be clear that this lethal blend of threats is pushing the security firms to redefine their product strategies, since they face the double crucial challenge to dramatically improve not only their 0-day detection ability, but also to dramatically improve the capability to manage and correlate the data collected from their security solutions.

As far as 0-day detection ability is concerned, next-gen technologies will include processor assisted endpoint security or also a new class of network devices such as DNS Firewalls (thanks to @nientenomi for reporting the article).

As far data management and correlation are concerned, yes of course a SIEM is beautiful concept… until one needs to face the issue of correlation, which definitively mean that often SIEM projects become useless because of correlation patterns, which are too complex and not straightforward. This is the reason why the leading vendors are rushing to include an integrated SIEM technology in their product portfolio in order to  provide an out-of-the-box correlation engine optimized for their products. The price to pay will probably be a segmentation and verticalization of SIEM Market in which lead vendors will have their own solution (not so optimized for competitor technologies) at the expense of generalist SIEM vendors.

On the other hand APT are alive and kicking, keep on targeting US Defense contractors (Raytheon is the latest) and are also learning to fly though the clouds. Moreover they are also well hidden considered that, according to the Security Intelligence Report Volume 11 issued by Microsoft, less than one per cent of exploits in the first half of 2011 were against zero-day vulnerabilities. The 1% makes the difference! And it is a big difference!

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