Master Linux Intrusion Detection with RKHunter: Installation, Features, and Usage
This guide introduces RKHunter, an open‑source Linux intrusion detection tool, detailing its key features, core functions such as MD5 checks and rootkit detection, step‑by‑step usage commands, database updates, and a quick installation process for version 1.4.2.
Features
(1) Easy installation, fast execution.
(2) Full scan range, capable of detecting known rootkit signatures, port scans, and changes to common program files.
Main Functions
(1) MD5 checksum test to detect any file modifications.
(2) Detect binaries and system tools used by rootkits.
(3) Detect Trojan program signatures.
(4) Detect abnormal attributes of most common programs.
(5) Scan any interface in promiscuous mode and common backdoor ports.
(6) Detect all configuration files, log files, and any hidden or abnormal files under directories such as /etc/rc.d/.
Usage
Execute the RKHunter check command: # rkhunter -c RKHunter performs a series of checks and highlights problems with red warnings that require your attention.
RKHunter relies on its own database, so keeping the database up‑to‑date is crucial. Update the database with: # rkhunter --update It is advisable to add the update command to a scheduled task.
Installation
Official website: http://rkhunter.sourceforge.net/
Download and extract the package (example version 1.4.2): tar zxf rkhunter-1.4.2.tar.gz Enter the extracted directory and run the installer script, which completes quickly:
cd rkhunter-1.4.2./installer.sh --installJava High-Performance Architecture
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