Sophos Linux Anti-Virus Notes


# Introduction

https://www.sophos.com/en-us/products/free-tools/sophos-antivirus-for-linux.aspx
PDF with instructions
https://docs.sophos.com/esg/SAV-Linux/help/en-us/PDF/sav_linux_cg.pdf 

# Installation
Prerequisites
yum install kernel-devel

Wget file sav-linux-free-9.tgz
Untar file
tar -xvzf sav-linux-free-9.tgz

#auto install no prompts target Sophos for updates. Installation takes quite a while. 
./install.sh /opt/sophos-av --acceptlicence --autostart=False --enableOnBoot=False --automatic --update-source-type=s

#Enable on-access scanning
./install.sh /opt/sophos-av --acceptlicence --autostart=True --enableOnBoot=True --automatic --update-type=s --enableOnAccess=True

#enable auto updating with free version and with on-access scanning
./install.sh /opt/sophos-av --acceptlicense --autostart=True --enableOnBoot=True --sophos --automatic --update-type=s --update-free=True --enableOnAccess=True --live-protection=False

#working free!
./install.sh /opt/sophos-av --acceptlicense --autostart=True --enableOnBoot=True --sophos --update-type=s --enableOnAccess=True --update-free=True

#working, but can’t get automatic to work with free
/root/sophos-av/install.sh /opt/sophos-av --acceptlicense --autostart=True --enableOnBoot=True --update-type=s --enableOnAccess=True --update-free=True --sophos

#required post installation setup for updates
/opt/sophos-av/bin/savsetup

Additional settings
https://community.sophos.com/products/endpoint-security-control/f/sophos-endpoint-software/73918/how-to-package-with-mkinstpkg-under-linux-because-i-find-hard

# Build Binary (deb/rpm)
yum install rpm-build rpm

/opt/sophos-av/update/
./mkinstpkg -r --sophos --rpm-version=0.1 --rpm-release=0.1 --update-type=s

Commandline:  --enableSavProtectOnBoot=True --update-free=True --update-source-username=FAVLvRQL133F0 --update-source-password=k5va9rpkv5i --instdir=/opt/sophos-av --update-cache-path=/opt/sophos-av/update/cache/Primary --update-type=s --update-source-path=sophos: --acceptlicence=True --enableRMS=false --automatic=True --enableOnAccess=true --update-period-minutes=60

RPM package is '/opt/sophos-av/update/savinstpkg-0.1-0.1.x86_64.rpm'

If you get this error:

./install.sh: line 34: /tmp/sophos_distribution_N53lTic/exectest: Permission denied
Cannot execute files within /tmp directory. Please see KBA 131783 http://www.sophos.com/kb/131783

Option 1
Then run this command to temporarily adjust the /tmp noexec

mount -o remount,exec /tmp

Then run the above install.sh command again. Once finished, run this command to turn it back on.

mount -o remount,noexec /tmp

Option 2

export TMPDIR=/var/tmp

Option 3

mkdir /root/tmp
export TMPDIR=/root/tmp

#Uninstall
/opt/sophos-av/uninstall.sh

# Configuration

#Edit or query configurations
/opt/sophos-av/bin/savconfig
/opt/sophos-av/bin/savconfig --all


View Update source information:
/opt/sophos-av/bin/savsetup

As for pulling updates, normally standalone machines will update directly from Sophos through an internet line, but they can be configured to pull updates from other locations such as an Update Manager if you were to have a SEC deployment.  If you are looking to limit internet bandwidth or restrict internet access, a workaround that may work is to have one Linux and one UNIX machine with Sophos installed that can reach out to the internet to pull updates.  Set up an SMB share for /opt/sophos-av/update/cache/Primary/ and configure the other Linux/UNIX machines update from this SMB share.

Logs are located at /opt/sophos-av/log

# Manually Update 
This will update signatures and engine
/opt/sophos-av/bin/savupdate


# Scheduled Scan

See the example at /opt/sophos-av/doc/namedscan.example.en


See PDF for additional instructions
/opt/sophos-av/bin/savconfig add NamedScans Daily /home/fred/DailyScan


Exclude dirs

ExcludePath ^/proc/
ExcludePath ^/sys/
ExcludePath ^/dev/
ExcludePath ^/etc/gshadow-
ExcludePath ^/etc/shadow-
ExcludePath ^/etc/shadow
ExcludePath ^/etc/gshadow
ExcludePath ^/etc/selinux/*
ExcludePath ^/etc/audit/*
ExcludePath ^/etc/security/*
ExcludePath ^/var/log/audit/*
ExcludePath ^/etc/krb5.keytab

User clamscan

# Usage

View logs 
/opt/sophos-av/bin/savlog
/opt/sophos-av/bin/savlog --systemLog

Log file for Splunk
cat /opt/sophos-av/log/savd.log

Logs are also pushed to internal syslog and /opt/sophos-av/log/savd.log
tail -200 /var/log/messages | grep savd

View status
/opt/sophos-av/bin/savdstatus

Manage the service
/opt/sophos-av/bin/savdctl

Start on demand scan
savscan /.
savscan /home/brad



EICAR test file

.com file can be used for on-access scan testing. And eicar.txt can be used for on-demand scan testing. 

eicar.com/eicar.txt
X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

http://www.eicar.org/download/eicar.com