RKHunter is a security tool that is used to detect rootkits on a Unix-based system. A rootkit is a type of malicious software that is designed to gain root-level access to a system, allowing the attacker to control the system and hide their activities from the user and system administrators. Rootkits can be difficult to detect because they often operate at a low level within the system and can modify or hide system files and processes.

RKHunter is a command-line tool that can be used to scan the system for rootkits and other malicious software. It uses a combination of signature-based detection and heuristics to identify potential threats, and it can also monitor system files and processes for changes that may indicate the presence of a rootkit. RKHunter can be run on a regular basis to check for rootkits, and it can also be used to perform one-time scans of the system. It is typically used as part of a security-hardening process or to investigate suspicious activity on a system.

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