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W32.Duqu: The Precursor to the Next Stuxnet

18
Oct
2011

On October 14, 2011, we were alerted to a sample that appeared to be very similar to Stuxnet by a research lab with strong international connections. They named the threat Duqu [dyü-kyü] because it creates files with the file name prefix “~DQ”. They provided us with samples recovered from computer systems located in Europe and also a detailed report with their initial findings, including analysis comparing the threat to Stuxnet, which we were able to confirm. Parts of Duqu are nearly identical to Stuxnet, but with a completely different purpose.

Duqu is essentially the precursor to a future Stuxnet-like attack. The threat was written by the same authors (or those that have access to the Stuxnet source code) and appears to have been created after the last recovered Stuxnet file. Duqu's purpose is to gather intelligence data and assets from entities, such as industrial control system manufacturers, in order to more easily conduct a future attack against another third party. The attackers are looking for information such as design documents that could help them mount a future attack on an industrial control facility.

Duqu does not contain any code related to industrial control systems and is primarily a remote access Trojan (RAT). The threat does not self-replicate. Our telemetry shows the threat was highly targeted toward a limited number of organizations for their specific assets. However, it’s possible that other attacks are being conducted against other organizations in a similar manner with currently undetected variants.

The attackers used Duqu to install another infostealer that could record keystrokes and gain other system information. The attackers were searching for assets that could be used in a future attack. In one case, the attackers did not appear to successfully exfiltrate any sensitive data, but details are not available in all cases. Two variants were recovered and, in reviewing our archive of submissions, 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.

One of the variant’s driver files was signed with a valid digital certificate expiring August 2, 2012. The digital certificate belongs to a company headquartered in Taipai, Taiwan. The certificate was revoked on October 14, 2011.

Duqu uses HTTP and HTTPS to communicate to a command and control server which, at the time of writing, is still operational. Through the command and control server the attackers were able to download additional executables, including an infostealer that can perform actions such as enumerating the network, recording keystrokes, and gathering system information. The information is logged to a lightly encrypted and compressed local file, which then must be exfiltrated out.

The threat uses a custom command and control protocol, primarily downloading or uploading what appear to be JPG files. However, in addition to transferring dummy JPG files, additional data for exfiltration is encrypted and sent, and likewise received.

Finally, the threat is configured to run for 36 days. After 36 days, the threat will automatically remove itself from the system.

Duqu shares a great deal of code with Stuxnet; however, the payload is completely different. Instead of a payload designed to sabotage an industrial control system, the payload has been replaced with general remote access capabilities. The creators of Duqu had access to the source code of Stuxnet, not just the Stuxnet binaries. The attackers intend to use this capability to gather intelligence from a private entity to aid future attacks on a third party. While suspected, no similar precursor files have been recovered that date prior to the Stuxnet attacks.

You can find additional details in our paper here. The research lab that originally found the sample has allowed us to share their initial report as an appendix. We expect to make further updates over the coming days.

Key points are:

•    Executables developed after Stuxnet using the Stuxnet source code have been discovered.
•    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.

Note: At press time we have recovered additional variants from an additional organization in Europe with a compilation time of October 17, 2011. These variants have not yet been analyzed. More information will follow.

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