Linux Malware Detect (LMD) is a malware scanner for Linux released under the GNU GPLv2 license, that is designed around the threats faced in 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. In addition, threat data is also derived from user submissions with the LMD checkout feature and from malware community resources. The signatures that LMD uses are MD5 file hashes and HEX pattern matches, they are also easily exported to any number of detection tools such as ClamAV.
Installing LMD
To install LMD, download the package and run the enclosed install.sh script
Download maldetect package using wget
Go to the below path
cd /usr/local/src/
Download the tar file using the below link:
wget http://www.rfxn.com/downloads/maldetect-current.tar.gz
Extract the file using the below command
tar -xzf maldetect-current.tar.gz
go to the maldet folder
cd maldetect-*
Now, run the below command to install maldet.
sh ./install.sh or sudo sh ./install.sh
It will give below output
Linux Malware Detect v1.3.4
(C) 1999-2010, R-fx Networks <proj@r-fx.org>
(C) 2010, Ryan MacDonald <ryan@r-fx.org>
inotifywait (C) 2007, Rohan McGovern <rohan@mcgovern.id.au>
This program may be freely redistributed under the terms of the GNU GPL
installation completed to /usr/local/maldetect
config file: /usr/local/maldetect/conf.maldet
exec file: /usr/local/maldetect/maldet
exec link: /usr/local/sbin/maldet
cron.daily: /etc/cron.daily/maldet
maldet(32517): {sigup} performing signature update check…
maldet(32517): {sigup} local signature set is version 2010051510029
maldet(32517): {sigup} latest signature set already installed
Configuring LMD
By default all options are fully commented in the configuration file, so configure it according to your needs. But before making any changes let’s have a detailed review of each option below.
email_alert : If you would like to receive email alerts, then it should be set to 1.
email_subj : Set your email subject here.
email_addr : Add your email address to receive malware alerts.
quar_hits : The default quarantine action for malware hits, it should be set 1.
quar_clean : Cleaning detected malware injections, must set to 1.
quar_susp : The default suspend action for users wih hits, set it as per your requirements.
quar_susp_minuid : Minimum userid that can be suspended.
Open file /usr/local/maldetect/conf.maldet and make changes according to your needs
nano /usr/local/maldetect/conf.maldet
To update the maldet use the below commands.
maldet -u or maldet -d
To scan the files. perticular user
maldet -a /home/username/
It will scan all the files and provide you the output.
To scan all user under public_html paths under /home*/ this can be done with:
root@server[~]# maldet –scan-all /home?/?/public_html
root@server[~]-maldet –scan-all /home
To scan the same path but the content that has been created/modified in the last 5 days:
root@server[~]# maldet –scan-recent /home?/?/public_html 5
To scan but forget to turn on the quarantine option, you could quarantine all malware results from a previous scan with:
root@server[~]# maldet –quarantine SCANID
If you wanted to attempt a clean on all malware results from a previous scan that did not have the feature enabled, you would do with.
root@server[~]# maldet –clean SCANID
If you had a file that was quarantined from a false positive or that you simply want to restore (i.e: you manually cleaned it), you can use the following:
root@server[~]# maldet –restore config.php.2384
root@server[~]# maldet –restore /usr/local/maldetect/quarantine/config.php.2384
