{"id":212,"date":"2020-04-17T13:32:58","date_gmt":"2020-04-17T13:32:58","guid":{"rendered":"https:\/\/pheonixsolutions.com\/knowledge-base\/?p=212"},"modified":"2020-04-17T13:32:59","modified_gmt":"2020-04-17T13:32:59","slug":"how-to-install-rkhunter-on-linux-server","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/knowledge-base\/2020\/04\/17\/how-to-install-rkhunter-on-linux-server\/","title":{"rendered":"How to install Rkhunter on Linux server"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">How to install Rkhunter on Linux server<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Date: 11-04-2020<\/strong><\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Introduction:<\/h4>\n\n\n\n<p>Rkhunter (Rootkit Hunter) is an open-source scanner for Linux systems to find out if the server is infected by any rootkits.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"363\" height=\"139\" src=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2020\/04\/images.png\" alt=\"\" class=\"wp-image-256\" srcset=\"https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2020\/04\/images.png 363w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2020\/04\/images-300x115.png 300w, https:\/\/pheonixsolutions.com\/knowledge-base\/wp-content\/uploads\/2020\/04\/images-150x57.png 150w\" sizes=\"auto, (max-width: 363px) 100vw, 363px\" \/><\/figure>\n\n\n\n<p>A rootkit is a type of software that is designed to hide the existence of certain processes or programs from normal methods of detection.<\/p>\n\n\n\n<p>Rootkits are generally associated with malware- such as Trojans, viruses, worms.<\/p>\n\n\n\n<p>A rootkit an infected server also has access to log files and spy on computer administrator usage.<\/p>\n\n\n\n<p>Rootkit Hunter scans hidden files, wrong permissions set on binaries, suspicious strings in kernel, etc.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Step 1: Downloading Rkhunter:<\/h4>\n\n\n\n<p>Let\u2019s move the current directory to the temp directory.<br># cd \/tmp<br><br>Download the latest version of Rkhunter by executing the command below. <br>#wget http:\/\/downloads.sourceforge.net\/project\/rkhunter\/rkhunter\/1.4.2\/rkhunter-1.4.2.tar.gz<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Step 2: Installing Rkhunter:<\/h4>\n\n\n\n<p>Unzip the downloaded rkhunter by using the below command.<br>#tar -zxvf rkhunter-1.4.2.tar.gz<br><br>Change the current working directory to the rkhunter directory.<br>#cd rkhunter-1.4.2<br><br>Install the rkhunter package by executing the installation script.<br>#.\/installer.sh &#8211;layout default &#8211;install<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Step 3: Updating Rkhunter:<\/h4>\n\n\n\n<p>To check the rkhunter current version.<br>#\/usr\/local\/bin\/rkhunter &#8211;versioncheck<br><br>To update the rkhunter available latest version.<br>#\/usr\/local\/bin\/rkhunter &#8211;update<br><br>If the database files are updated, to check and save the updated values and properties,<br>#\/usr\/local\/bin\/rkhunter &#8211;propupd<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Step 4: Manual Scan and Usage:<\/h4>\n\n\n\n<p>To scan the entire file system run.<br># rkhunter &#8211;check<\/p>\n\n\n\n<p>Sample Output:<br><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">[ Rootkit Hunter version 1.4.2 ]\n\nChecking system commands...\n\n  Performing 'strings' command checks\n    Checking 'strings' command                               [ OK ]\n\n  Performing 'shared libraries' checks\n    Checking for preloading variables                        [ None found ]\n    Checking for preloaded libraries                         [ None found ]\n    Checking LD_LIBRARY_PATH variable                        [ Not found ]\n\n  Performing file properties checks\n    Checking for prerequisites                               [ OK ]\n    \/usr\/local\/bin\/rkhunter                                  [ OK ]\n    \/usr\/sbin\/adduser                                        [ OK ]\n    \/usr\/sbin\/chkconfig                                      [ OK ]\n    \/usr\/sbin\/chroot                                         [ OK ]\n    \/usr\/sbin\/depmod                                         [ OK ]\n    \/usr\/sbin\/fsck                                           [ OK ]\n    \/usr\/sbin\/fuser                                          [ OK ]\n    \/usr\/sbin\/groupadd                                       [ OK ]\n    \/usr\/sbin\/groupdel                                       [ OK ]\n    \/usr\/sbin\/groupmod                                       [ OK ]\n    \/usr\/sbin\/grpck                                          [ OK ]\n    \/usr\/sbin\/ifconfig                                       [ OK ]\n    \/usr\/sbin\/ifdown                                         [ Warning ]\n    \/usr\/sbin\/ifup                                           [ Warning ]\n    \/usr\/sbin\/init                                           [ OK ]\n    \/usr\/sbin\/insmod                                         [ OK ]\n    \/usr\/sbin\/ip                                             [ OK ]\n    \/usr\/sbin\/lsmod                                          [ OK ]\n    \/usr\/sbin\/lsof                                           [ OK ]\n    \/usr\/sbin\/modinfo                                        [ OK ]\n    \/usr\/sbin\/modprobe                                       [ OK ]\n    \/usr\/sbin\/nologin                                        [ OK ]\n    \/usr\/sbin\/pwck                                           [ OK ]\n    \/usr\/sbin\/rmmod                                          [ OK ]\n    \/usr\/sbin\/route                                          [ OK ]\n    \/usr\/sbin\/rsyslogd                                       [ OK ]\n    \/usr\/sbin\/runlevel                                       [ OK ]\n    \/usr\/sbin\/sestatus                                       [ OK ]\n    \/usr\/sbin\/sshd                                           [ OK ]\n    \/usr\/sbin\/sulogin                                        [ OK ]\n    \/usr\/sbin\/sysctl                                         [ OK ]\n    \/usr\/sbin\/tcpd                                           [ OK ]\n    \/usr\/sbin\/useradd                                        [ OK ]\n    \/usr\/sbin\/userdel                                        [ OK ]\n    \/usr\/sbin\/usermod                                        [ OK ]\n....\n[Press  to continue]\n\n\nChecking for rootkits...\n\n  Performing check of known rootkit files and directories\n    55808 Trojan - Variant A                                 [ Not found ]\n    ADM Worm                                                 [ Not found ]\n    AjaKit Rootkit                                           [ Not found ]\n    Adore Rootkit                                            [ Not found ]\n    aPa Kit                                                  [ Not found ]\n.....\n\n[Press  to continue]\n\n\n  Performing additional rootkit checks\n    Suckit Rookit additional checks                          [ OK ]\n    Checking for possible rootkit files and directories      [ None found ]\n    Checking for possible rootkit strings                    [ None found ]\n\n....\n[Press  to continue]\n\n\nChecking the network...\n\n  Performing checks on the network ports\n    Checking for backdoor ports                              [ None found ]\n....\n  Performing system configuration file checks\n    Checking for an SSH configuration file                   [ Found ]\n    Checking if SSH root access is allowed                   [ Warning ]\n    Checking if SSH protocol v1 is allowed                   [ Warning ]\n    Checking for a running system logging daemon             [ Found ]\n    Checking for a system logging configuration file         [ Found ]\n    Checking if syslog remote logging is allowed             [ Not allowed ]\n...\nSystem checks summary\n=====================\n\nFile properties checks...\n    Files checked: 137\n    Suspect files: 6\n\nRootkit checks...\n    Rootkits checked : 383\n    Possible rootkits: 0\n\nApplications checks...\n    Applications checked: 5\n    Suspect applications: 2\n\nThe system checks took: 5 minutes and 38 seconds\n\nAll results have been written to the log file: \/var\/log\/rkhunter.log\n\nOne or more warnings have been found while checking the system.\nPlease check the log file (\/var\/log\/rkhunter.log)<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Step 5: <strong>Scheduling Automatic Scans<\/strong>:<\/h4>\n\n\n\n<p>Setting Cronjob and Email Alerts:<br>Create a file called&nbsp;<strong>rkhunter.sh<\/strong>&nbsp;under&nbsp;<strong>\/etc\/cron.daily\/<\/strong>, which then scans your file system every day and sends email notifications to your email id.<br><br>Open the file to write the script.<br># vi \/etc\/cron.daily\/rkhunter.sh<br><br>Paste the below-given script in this file and replace \u201c<strong>Server name<\/strong>\u201d with your \u201c<strong>Server Host Name\u201d<\/strong> and \u201c<strong>mail id<\/strong>\u201d with your \u201c<strong>Email Id<\/strong>\u201c.<br><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#!\/bin\/sh\n(\n\/usr\/local\/bin\/rkhunter --versioncheck\n\/usr\/local\/bin\/rkhunter --update\n\/usr\/local\/bin\/rkhunter --cronjob --report-warnings-only\n) | \/bin\/mail -s 'rkhunter Daily Run <strong>(Server name)' mail id<\/strong><\/pre>\n\n\n\n<p>Change the permission of the file to 755.<br># chmod 755 \/etc\/cron.daily\/rkhunter.sh<\/p>\n\n\n\n<p>For more information and options please run the following command<br># rkhunter &#8211;help<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Step 6: <strong>Configuration Of Rkhunter<\/strong><\/h4>\n\n\n\n<p>Configuration file of rkhunter is&nbsp;<strong>\/etc\/rkhunter.conf&nbsp;<\/strong>. We can modify the properties of rkhunter accordingly to secure the server.<\/p>\n\n\n\n<p>To restrict the root login to the server over SSH<br>ALLOW_SSH_ROOT_USER = no<\/p>\n\n\n\n<p>To allow the root login to the server over SSH&nbsp;<br>ALLOW_SSH_ROOT_USER = yes<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Conclusion:<\/h4>\n\n\n\n<p>There are several tools you can download to scan your machines and servers for rootkits. So why choose rkhunter? Because of its speed and ease of use. It provides you with a solution to keep your assets free of rootkit and other threatening, malicious programs.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><br><\/p>\n\n\n\n<p><br><br><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to install Rkhunter on Linux server Date: 11-04-2020 Introduction: Rkhunter (Rootkit Hunter) is an open-source scanner for Linux systems to find out if the server is infected by any rootkits. A rootkit is a type of software that is designed to hide the existence of certain processes or programs from normal methods of detection. ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2020\/04\/17\/how-to-install-rkhunter-on-linux-server\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,4],"tags":[9],"class_list":["post-212","post","type-post","status-publish","format-standard","hentry","category-dedicated-hosting","category-vps-hosting","tag-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to install Rkhunter on Linux server - PheonixSolutions Knowledge-Base<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pheonixsolutions.com\/knowledge-base\/2020\/04\/17\/how-to-install-rkhunter-on-linux-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to install Rkhunter on Linux server - PheonixSolutions Knowledge-Base\" \/>\n<meta property=\"og:description\" content=\"How to install Rkhunter on Linux server Date: 11-04-2020 Introduction: Rkhunter (Rootkit Hunter) is an open-source scanner for Linux systems to find out if the server is infected by any rootkits. 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