rootkit
Explanation:
A rootkit is a set of tools that take Administrative control of a computer system without authorization by the
computer owners and/or legitimate managers. A rootkit requires root access to be installed in the Linux
operating system, but once installed, the attacker can get root access at any time. Rootkits have the following
features:
They allow an attacker to run packet sniffers secretly to capture passwords.
They allow an attacker to set a Trojan into the operating system and thus open a backdoor for anytime access.
They allow an attacker to replace utility programs that can be used to detect the attacker's activity.
They provide utilities for installing Trojans with the same attributes as legitimate programs.