The BPFdoor malware has been undetected in the wild for more than five years – infecting Linux and Solaris systems. The malware can give remote access to the shell and complete control to a compromised system.
BPFdoor: Stealthy Linux malware bypasses firewalls for remote access (bleepingcomputer.com)
The twist with this malware is that it does not need to open ports, it is a passive backdoor listening for incoming commands, and so firewalls cannot stop it. This makes it an ideal tool for long term intrusions and espionage – if it remains undetected.
Clive Catton MSc (Cyber Security) – by-line and other articles
