IBM Security X-Force researchers studied the botnet activity of a malware variant that is used by cyber crime groups to illegally mine cryptocurrency. The illegal mining of cryptocurrency on devices one does not own, aka cryptojacking, has become a commercial grade threat used in the hands of lone criminals and organized groups alike. ShellBot is a simple piece of Perl-based code that enables attackers to mount internet relay chat (IRC)-controlled botnets that command coin mining on computers, Linux servers, Android devices and Internet of Things devices.”]
Source: https://securityintelligence.com/posts/shellbot-publicly-available-cryptocurrency-miner/