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AryaN Botnet analysis – Part 2 (April 13, 2012)

by Security News

SonicWALL Threats Research team reported about an active IRC based AryaN botnet in the wild last week. We continued to monitor the botnet activity and looked further at its origin.

We found that the AryaN Botnet builder kit was first released on September 11, 2011 on one of the underground forums. This was followed by a leak of source code and builder later that month. The builder was written in Borland Delphi and the interface looks like this:

Botnet commands as advertised by the author:

Features of Bot:

  • Geo/OS aware and named using following convention:
    • AryaN{%s-%s-x%d}%s -> AryaN{CountryCode-OperatingSystem-Architecture}BotID

  • Connects to a remote C&C server and waits for command

  • Capable of DoS attacks

  • Spreads by infected Removable devices

  • Injects itself into explorer.exe

The botnet we were monitoring over past week is hosted in U.K. It grew close to 1000+ bots over a period of one week and we observed following activity:

  • New AryaN bot update and subsequent redirection to a new IRC server/channel.

  • Instruction to download Bitcoin miner Trojan. Below are the domains that were contacted by the downloaded Trojan:

    • eu.triplemining.com:8344
    • eu1.triplemining.com:8344
    • litecoinpool.org:9332

  • Instruction to perform DoS flooding attacks.

  • Instructions to download multiple other pay per install malware binaries and infect the victim machine.

SonicWALL Gateway AntiVirus provides protection against this threat via the following signatures:

  • GAV: Scar.GAJG (Trojan)
  • GAV: IRCBot.AYN_2 (Trojan)
  • GAV: Agent.ADC (Trojan)

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.