How to Install Rkhunter on Debian 10

1. Install Rkhunter #

Install rkhunter with apt.

$ sudo apt install rkhunter -y

2. Configure Rkhunter #

Rkhunter uses data files to store information on possible threats. Unfortunately, the default configuration of Debian does not allow us to update these files. We will adjust the settings to correct this issue.

  1. Edit the /etc/rkhunter.conf file with nano.
    $ sudo nano /etc/rkhunter.conf
    

    Type CTRL+W to search for WEB_CMD=”/bin/false”.
    Add a # comment at the beginning of the line to disable the statement.

    # WEB_CMD="/bin/false"
    
  2. Type CTRL+W to search for UPDATE_MIRRORS.
  3. Set UPDATE_MIRRORS value to 1.
    UPDATE_MIRRORS=1
    
  4. Type CTRL+W to search for MIRRORS_MODE.
  5. Set MIRRORS_MODE value to 0.
    MIRRORS_MODE=0
    
  6. (Optional) Enable email notifications.Type CTRL+W to search for MAIL-ON-WARNING.
    Remove the # comment at the beginning of the line and assign an email address.

    [email protected]
    
  7. Save and exit the file.

3. Confirm Configuration File #

Make sure your configuration file is valid with the following command:

$ sudo rkhunter -C

If there is no output, your configuration file is valid.

4. Update the Data Files #

Update the rkhunter data files.

$ sudo rkhunter --update

5. Check the Local System #

To check the local system, use the check parameter.

$ sudo rkhunter --check

When finished, inspect /var/log/rkhunter.log for warnings and alerts.

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