Linux

Install Linux Malware Detect (LMD) on RHEL/CentOS/Fedora Linux

Malware is known as software which is specifically designed to disrupt or damage a computer system.
Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in a shared hosted environments. It uses threat data from network edge intrusion detection systems to extract malware that is actively being used in attacks and generates signatures for detection. More about this software see on the official site

LMD Features

  • MD5 file hash detection for quick threat identification
  • HEX based pattern matching for identifying threat variants
  • statistical analysis component for detection of obfuscated threats (e.g: base64)
  • integrated detection of ClamAV to use as scanner engine for improved performanc
  • integrated signature update feature with -u|–updat
  • integrated version update feature with -d|–update-ver
  • scan-recent option to scan only files that have been added/changed in X days
  • scan-all option for full path based scanning
  • checkout option to upload suspected malware to rfxn.com for review / hashing
  • full reporting system to view current and previous scan results
  • quarantine queue that stores threats in a safe fashion with no permissions
  • quarantine batching option to quarantine the results of a current or past scans
  • quarantine restore option to restore files to original path, owner and perms
  • quarantine suspend account option to Cpanel suspend or shell revoke users
  • cleaner rules to attempt removal of malware injected strings
  • cleaner batching option to attempt cleaning of previous scan reports
  • cleaner rules to remove base64 and gzinflate(base64 injected malware
  • daily cron based scanning of all changes in last 24h in user homedirs
  • daily cron script compatible with stock RH style systems, Cpanel & Ensim
  • kernel based inotify real time file scanning of created/modified/moved files
  • kernel inotify monitor that can take path data from STDIN or FILE
  • kernel inotify monitor convenience feature to monitor system users
  • kernel inotify monitor can be restricted to a configurable user html root
  • kernel inotify monitor with dynamic sysctl limits for optimal performance
  • kernel inotify alerting through daily and/or optional weekly reports
  • e-mail alert reporting after every scan execution (manual & daily)
  • path, extension and signature based ignore options
  • background scanner option for unattended scan operations
  • verbose logging & output of all actions

Install Linux Malware Detect (LMD)

First, login to your server using ssh client (Putty for windows users) and download the latest LMD source packages from offical site using wget command:

# cd /opt
# http://www.rfxn.com/downloads/maldetect-current.tar.gz

Now extract downloaded archove and install LMD tool:

# tar xvf maldetect-current.tar.gz
# cd maldetect-1.4.2
# sh install.sh

Configure Linux Malware Detect

LMD configure configuration file on this /usr/local/maldetect/conf.maldet path. Now, edit this file (red lines аrе marked by that should be changed):

# [ EMAIL ALERTS ]
##
# The default email alert toggle
# [0 = disabled, 1 = enabled]
email_alert=1
 
# The subject line for email alerts
email_subj="MLD Scan Report from $(hostname)"
 
# The destination addresses for email alerts
# [ values are comma (,) spaced ]
email_addr="[email protected]"
 
# Ignore e-mail alerts for reports in which all hits have been cleaned.
# This is ideal on very busy servers where cleaned hits can drown out
# other more actionable reports.
email_ignore_clean=0
 
##
# [ QUARANTINE OPTIONS ]
##
# The default quarantine action for malware hits
# [0 = alert only, 1 = move to quarantine & alert]
quar_hits=1
 
# Try to clean string based malware injections
# [NOTE: quar_hits=1 required]
# [0 = disabled, 1 = clean]
quar_clean=1
 
# The default suspend action for users wih hits
# Cpanel suspend or set shell /bin/false on non-Cpanel
# [NOTE: quar_hits=1 required]
# [0 = disabled, 1 = suspend account]
quar_susp=0

# minimum userid that can be suspended
quar_susp_minuid=500

LMD Start manualy

After succefully installed and configured Linux Malware Detect tool (LMD) on your system, lets run your first scann using following command:

# maldet --scann-all /var/www/http

The above command scanned all files under /var/www/http directory. After scanning type following command to show lmd report:

#  maldet --report 030815-1747.26975

Example output:

malware detect scan report for Lintut:
SCAN ID: 030815-1747.26975
TIME: Mar  8 17:47:34 -0400
PATH: /var/www/http
TOTAL FILES: 18
TOTAL HITS: 0
TOTAL CLEANED: 0

===============================================
Linux Malware Detect v1.4.2 < [email protected] >

That is all!
Reference: Linux Malware Detect official site

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