Stuxnet Updates Through P2P Communications

Symantec finds that peer-to-peer networks can propagate the malware, even though its command and control systems are now offline.

On Friday, Symantec said that its ongoing analysis of Stuxnet has revealed that the malware is designed to spread via a peer-to-peer (P2P) communications channel.
Our continued research has revealed that as well as being controlled via a command and control infrastructure, the threat also has the ability to update itself via a peer-to-peer component, said Liam O Murchu, writing on Symantecs Security Response Symantecs
blog
.
The capability works via a remote procedure call (RPC) server and client, which are installed by the malware. Infected machines contact each other and check which machine has the latest version of the threat installed, he said. Whichever machine has the latest version transfers it to the other machine and in this way the worm is able to update itself without contacting a central command and control server.
As a result, attackers may still be able to update and control the worm via P2P channels. The creators of Stuxnet were aware that they might lose control of their command and control servers so they built in a P2P update function to prepare for that eventuality, said Murchu.
Researchers keep finding that theres more than meets the eye to Stuxnet. For example, the malware -- which appears to have been created to
exploit SCADA
systems designed by Siemens -- also targets a printer spooler service
impersonation vulnerability
in Microsoft Windows, which may have been first
detailed
publicly in 2009. The flaw allows Stuxnet to overwrite a printer spooler file and propagate. Microsoft patched the vulnerability last week as part of its September 2010 Patch Tuesday.
Another interesting finding made by Symantec is that while the malware appeared to be a never-before-seen, zero-day attack, it now appears that variants date from at least
June 2009
.

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Stuxnet Updates Through P2P Communications