[$] A free and open-source rootkit for Linux

While there are several rootkits that target Linux, they have so far not fully
embraced the open-source ethos typical of Linux software.
Luckily, Matheus Alves has been working to remedy
this lack by creating

an open-source rootkit called Singularity for Linux systems. Users who feel
their computers are too secure can install the Singularity kernel module in
order to allow remote code execution, disable security features, and hide files
and processes from normal administrative tools. Despite its many features,
Singularity is not currently known to be in use in the wild — instead, it
provides security researchers with a testbed to investigate new detection and
evasion techniques.