A recently discovered backdoor malware called BPFdoor has been stealthily targeting Linux and Solaris systems without being noticed for more than five years. BPFdoor is a Linux/Unix backdoor that allows threat actors to remotely connect to a Linux shell to gain complete access to a compromised device.
Link: BPFdoor: Stealthy Linux malware bypasses firewalls for remote access
via http://www.bleepingcomputer.com