Malware Analysis Sednit update: Analysis of Zebrocy by ESET

silversurfer

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The Sednit group – also known as APT28, Fancy Bear, Sofacy or STRONTIUM – is a group of attackers operating since 2004, if not earlier, and whose main objective is to steal confidential information from specific targets.

Toward the end of 2015, we started seeing a new component deployed by the group; a downloader for the main Sednit backdoor, Xagent. Kaspersky mentioned this component for the first time in 2017 in their APT trend report and recently wrote an article where they quickly described it under the name Zebrocy.

This new component is a family of malware, comprising downloaders and backdoors written in Delphi and AutoIt. These components play the same role in the Sednit ecosystem as Seduploader; that of first-stage malware.

Victims we have seen targeted by Zebrocy are located in Azerbaijan, Bosnia and Herzegovina, Egypt, Georgia, Iran, Kazakhstan, Korea, Kyrgyzstan, Russia, Saudi Arabia, Serbia, Switzerland, Tajikistan, Turkey, Turkmenistan, Ukraine, Uruguay and Zimbabwe. These targets include embassies, ministries of foreign affairs, and diplomats.

The Zebrocy family consists of three components. In the order of deployment these are a Delphi downloader, an AutoIt downloader and a Delphi backdoor. Figure 1 shows the relationship between these components.
In this article we describe this family and how it can coexist with the older Seduploader reconnaissance tools. We will talk about some similarities to and differences from Downdelph at the end.

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Full Analysis: Zebrocy used heavily by the Sednit group over last two years
 

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