Chkrootkit (check rootkit) – a tool for finding rootkits (malicious applications) in the operating system.
Ubuntu/Debian installation command:
sudo apt-get install chkrootkit
Run rootkit search:
sudo chkrootkit
Minimum information display mode:
sudo chkrootkit -q
You can add it to crontab for daily auto start like this:
sudo crontab -e
@daily chkrootkit | mail -s 'chkrootkit' test@ixnfo.com