rkhunter

rkhunter on Mac OS X
Initial release	2006; 18 years ago (2006)
Stable release	1.4.6 / 20 February 2018; 6 years ago (2018-02-20)
Repository	git.code.sf.net/p/rkhunter/rkh_code
Written in	Bourne shell, Perl
Operating system	Unix-like
Type	rootkit detector
License	GNU General Public License
Website	sourceforge.net/projects/rkhunter/

rkhunter (Rootkit Hunter) is a Unix-based tool that scans for rootkits, backdoors and possible local exploits. It does this by comparing SHA-1 hashes of important files with known good ones in online databases, searching for default directories (of rootkits), wrong permissions, hidden files, suspicious strings in kernel modules, and special tests for Linux and FreeBSD. rkhunter is notable due to its inclusion in popular operating systems (Fedora,^[1] Debian,^[2] etc.)

The tool has been written in Bourne shell, to allow for portability. It can run on almost all UNIX-derived systems.

Development

In 2003, developer Michael Boelen released the version of Rootkit Hunter. After several years of development, early 2006, he agreed to hand over development to a development team. Since that time eight people have been working to set up the project properly and work towards the much-needed maintenance release. The project has since been moved to SourceForge.