What is Shellbot Botnet

Shellbot Botnet is a botnet that primarily attacks Linux servers and vulnerable Internet of Things (IoT) devices. Cybersecurity company TrendMicro were the ones who uncovered the hacking group (which they named “Outlaw”) distributing the malware. Shellbot Botnet

“We uncovered an operation of a hacking group, which we’re naming “Outlaw” (translation derived from the Romanian word haiduc, the hacking tool the group primarily uses), involving the use of an IRC bot built with the help of Perl Shellbot.”

The group is reportedly responsible for compromising FTP servers of a Japanese art institution and a goverment site in Bangladesh. According to TrendMicro, they then linked the compromised servers to a high availability cluster to host an IRC bouncer, which they then used to command and control the emerging botnet.

“Aside from finding several exploit files that allowed us to understand how the initial exploit on the first server worked, we also found configuration files of the hackers’ toolset that allowed them to target organizations through DoS and SSH brute force, using so-called “class files.” Moreover, this suggests that the threat actors were building a botnet that can be used for cybercriminal purposes.”

Attackers have distributed the bot via an exploit targeting the ShellShock vulnerability in the past, but it has now been noted to be spread through the Drupalgeddon2 vulnerability. It seems that the malware primarily attacks IoT devices and Linux servers, but can also affect Windows-based environments and Android devices. In the attacks that have been analyzed, hackers reportedly took advantage of previously brute-forced or compromised hosts.

So far, no widespread attacks from the group have been noticed.

How to remove Shellbot Botnet malware

The malware should be detected by credible anti-malware software, such as ESET, Symantec and BitDefender. You can find a list of detections here.

  • Perl/Shellbot.NAI by ESET
  • Backdoor.Perl.Shellbot.B by BitDefender
  • BV:Shellbot-A [Expl] by Avast/AVG
  • SecurityRisk.gen1 by Symantec
  • Backdoor:Perl/Shellbot.Z by Microsoft


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