====== Systems - Media Server - Secure the Server - Install rkhunter ======

**rkhunter** is a rootkit detection tool.

----

===== Install rkhunter =====

<code bash>
sudo apt install rkhunter
</code>

<WRAP info>
**NOTE:**  For mail configuration, select **Leave as is**.

  * Choose a different option, depending on your needs.

</WRAP>


----

===== Configure RKHunter =====

Edit the /etc/default/rkhunter file.

<file bash /etc/default/rkhunter>
# if set [yes], daily cron job will be run
CRON_DAILY_RUN=""

# set email address to receive report
REPORT_EMAIL="root"
</file>

----

Edit the /etc/rkhunter.conf file.

<file bash /etc/rkhunter.conf>
# line 107 : change
UPDATE_MIRRORS=1

# line 122 : change
MIRRORS_MODE=0

# line 1190 : change to blank
WEB_CMD=""
</file>

----

===== Update database =====

<code bash>
sudo rkhunter --update
</code>

returns:

<code>
[ Rootkit Hunter version 1.4.6 ]

Checking rkhunter data files...
  Checking file mirrors.dat                                  [ Updated ]
  Checking file programs_bad.dat                             [ No update ]
  Checking file backdoorports.dat                            [ No update ]
  Checking file suspscan.dat                                 [ No update ]
  Checking file i18n/cn                                      [ Skipped ]
  Checking file i18n/de                                      [ Skipped ]
  Checking file i18n/en                                      [ No update ]
  Checking file i18n/tr                                      [ Skipped ]
  Checking file i18n/tr.utf8                                 [ Skipped ]
  Checking file i18n/zh                                      [ Skipped ]
  Checking file i18n/zh.utf8                                 [ Skipped ]
  Checking file i18n/ja                                      [ Skipped ]
</code>

----

===== Update system file properties =====

<code bash>
sudo rkhunter --propupd
</code>

returns:

<code>
[ Rootkit Hunter version 1.4.6 ]
File updated: searched for 179 files, found 141
</code>

----

===== Run checking =====

<code bash>
sudo rkhunter --check --sk
</code>

returns:

<code>
[ Rootkit Hunter version 1.4.6 ]

Checking system commands...

  Performing 'strings' command checks
    Checking 'strings' command                               [ OK ]

  Performing 'shared libraries' checks
    Checking for preloading variables                        [ None found ]
    Checking for preloaded libraries                         [ None found ]
    Checking LD_LIBRARY_PATH variable                        [ Not found ]

  Performing file properties checks
    Checking for prerequisites                               [ OK ]
    /usr/sbin/adduser                                        [ OK ]
    /usr/sbin/chroot                                         [ OK ]
    /usr/sbin/cron                                           [ OK ]
    /usr/sbin/depmod                                         [ OK ]
    /usr/sbin/fsck                                           [ OK ]
    /usr/sbin/groupadd                                       [ OK ]
    /usr/sbin/groupdel                                       [ OK ]
    /usr/sbin/groupmod                                       [ OK ]
    /usr/sbin/grpck                                          [ OK ]
    /usr/sbin/ifconfig                                       [ OK ]
    /usr/sbin/init                                           [ OK ]
    /usr/sbin/insmod                                         [ OK ]
    /usr/sbin/ip                                             [ OK ]
    /usr/sbin/lsmod                                          [ OK ]
    /usr/sbin/modinfo                                        [ OK ]
    /usr/sbin/modprobe                                       [ OK ]
    /usr/sbin/nologin                                        [ OK ]
    /usr/sbin/pwck                                           [ OK ]
...
...

System checks summary
=====================

File properties checks...
    Files checked: 141
    Suspect files: 0

Rootkit checks...
    Rootkits checked : 498
    Possible rootkits: 0

Applications checks...
    All checks skipped

The system checks took: 1 minute and 31 seconds

All results have been written to the log file: /var/log/rkhunter.log

One or more warnings have been found while checking the system.
Please check the log file (/var/log/rkhunter.log)

</code>