Malware
ConnectBack
aka Getshell
ConnectBack malware is a type of malicious software designed to establish unauthorized connections from an infected system to a remote server.
ConnectBack, also known as Getshell, is a Linux malware family.
Background
ConnectBack is malware built to open unauthorized connections from an infected host back out to a remote server. After compromising a victim's device, it sets up a covert communication channel that lets the attacker remotely operate the system and pull sensitive information from it.
Source: Malpedia (Fraunhofer FKIE).