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Présentation : Recently, research was published identifying a Tor exit node, located in Russia, that was consistently and maliciously modifying any uncompressed Windows executables downloaded through it. Naturally this piqued our interest, so we decided to peer down the rabbit hole. Suffice to say, the hole was a lot deeper than we expected In fact, it went all the way back to the notorious Russian APT family MiniDuke, known to have been used in targeted attacks against NATO and European government agencies. The malware used in this case is, however, not a version of MiniDuke. It is instead a separate, distinct family of malware that we have since taken to calling OnionDuke. But lets start from the beginning. When a user attempts to download an executable via the malicious Tor exit node, what they actually receive is an executable wrapper that embeds both the original executable and a second, malicious executable. By using a separate wrapper, the malicious actors are able to bypass any integrity checks the original binary might contain. Upon execution, the wrapper will proceed to write to disk and execute the original executable, thereby tricking the user into believing that everything went fine. However, the wrapper will also write to disk and execute the second executable. In all the cases we have observed, this malicious executable has been the same binary SHA1 a75995f94854dea8799650a2f4a97980b71199d2, detected as Trojan-Dropper W32 OnionDuke.A . This executable is a dropper containing a PE resource that pretends to be an embedded GIF image file. In reality, the resource is actually an encrypted dynamically linked library DLL file. The dropper will proceed to decrypt this DLL, write it to disk and execute it. A flowchart of the infection process A flowchart of the infection process Once executed, the DLL file SHA1 b491c14d8cfb48636f6095b7b16555e9a575d57f, detected as Backdoor W32 OnionDuke.B will decrypt an embedded configuration shown below and attempt to connect to hardcoded C C URLs specified in the configuration data. From these C Cs the malware may receive instructions to download and execute additional malicious components. It should be noted, that we believe all five domains contacted by the malware are innocent websites compromised by the malware operators, not dedicated malicious servers. Screenshot of the embedded configuration data A screenshot of the embedded configuration data Through our research, we have also been able to identify multiple other components of the OnionDuke malware family. We have, for instance, observed components dedicated to stealing login credentials from the victim machine and components dedicated to gathering further information on the compromised system like the presence of antivirus software or a firewall. Some of these components have been observed being downloaded and executed by the original backdoor process but for other components, we have yet to identify the infection vector. Most of these components don't embed their own C C information but rather communicate with their controllers through the original backdoor process. One component, however, is an interesting exception. This DLL file SHA1 d433f281cf56015941a1c2cb87066ca62ea1db37, detected as Backdoor W32 OnionDuke.A contains among its configuration data a different hardcoded C C domain, overpict.com and also evidence suggesting that this component may abuse Twitter as an additional C C channel. What makes the overpict.com domain interesting, is it was originally registered in 2011 with the alias of John Kasai . Within a two-week window, John Kasai also registered the following domains airtravelabroad.com, beijingnewsblog.net, grouptumbler.com, leveldelta.com, nasdaqblog.net, natureinhome.com, nestedmail.com, nostressjob.com, nytunion.com, oilnewsblog.com, sixsquare.net and ustradecomp.com. This is significant because the domains leveldelta.com and grouptumbler.com have previously been identified as C C domains used by MiniDuke. This strongly suggests that although OnionDuke and MiniDuke are two separate families of malware, the actors behind them are connected through the use of shared infrastructure. A graph showing the infrastructure shared between OnionDuke and MiniDuke A visualization of the infrastructure shared between OnionDuke and MiniDuke Based on compilation timestamps and discovery dates of samples we have observed, we believe the OnionDuke operators have been infecting downloaded executables at least since the end of October 2013. We also have evidence suggesting that, at least since February of 2014, OnionDuke has not only been spread by modifying downloaded executables but also by infecting executables in .torrent files containing pirated software. However, it would seem that the OnionDuke family is much older, both based on older compilation timestamps and also on the fact that some of the embedded configuration data make reference to an apparent version number of 4 suggesting that at least three earlier versions of the family exist. During our research, we have also uncovered strong evidence suggesting that OnionDuke has been used in targeted attacks against European government agencies, although we have so far been unable to identify the infection vector s . Interestingly, this would suggest two very different targeting strategies. On one hand is the shooting a fly with a cannon mass-infection strategy through modified binaries and, on the other, the more surgical targeting traditionally associated with APT operations. In any case, although much is still shrouded in mystery and speculation, one thing is certain. While using Tor may help you stay anonymous, it does at the same time paint a huge target on your back. It's never a good idea to download binaries via Tor or anything else without encryption. The problem with Tor is that you have no idea who is maintaining the exit node you are using and what their motives are. VPNs such as our Freedome VPN will encrypt your connection all the way through the Tor network, so the maintainers of Tor exit nodes will not see your traffic and can't tamper with it. Samples a75995f94854dea8799650a2f4a97980b71199d2 b491c14d8cfb48636f6095b7b16555e9a575d57f d433f281cf56015941a1c2cb87066ca62ea1db37 Detected as Trojan-Dropper W32 OnionDuke.A, Backdoor W32 OnionDuke.A, and Backdoor W32 OnionDuke.B. Post by Artturi lehtior2 On 14 11 14 At 05 00 AM

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