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Visiting The Bear Den

Jessy Campos

Technically speaking, Sednit is probably one of the best espionage group out there. Not only have they created a complex software ecosystem -- composed of tens of different components --, but they also regularly come out with 0-day exploits. Also remarkable is their ability to very quickly integrate newly published techniques in their toolkit. In particular, we will explain how they tend to operate and we will dive into technical details of their most impressive components: - DOWNDELPH, a mysterious downloader deployed in very rare cases and with advanced persistence methods. In particular, we found a Windows bootkit dropping this component, and also a Windows rootkit, both never documented. - XTUNNEL, a network proxy tool able to transform an infected machine into a pivot to contact computers normally unreachable from the Internet. Heavily obfuscated, and based on a custom encrypted protocol, XTUNNEL is a major asset in Sednit post-infection toolkit. - XAGENT, the flagship Sednit backdoor, for which Windows, Linux and iOS versions have been developed. Built as a modular framework around a so-called "kernel", it allows to build flexible backdoors with, for example, the ability to switch between various network protocols. - SEDKIT, a full-fledged exploit-kit, which depending on the target's configuration may drop 0-day exploits or revamped exploits. And also, during our tracking, we also gained a great visibility on Sednit post-infection modus operandi, a world full of Mimikatz and various custom hacking tools.

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