CentOS 8.x clamav

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Install Clamav and do basic scan

1. Install required packages using:

   dnf install -y epel-release
   dnf -y install clamav-server clamav-data clamav-update clamav-filesystem clamav clamav-scanner-systemd clamav-devel clamav-lib clamav-server-systemd

2. If SELinux is installed / enabled use following to allow clamav to scan system:

   setsebool -P antivirus_can_scan_system 1

3. Run freshclam to get the signatures

   freshclam

4. To scan entire filesystem use:

   clamscan -o --recursive / | grep -v 'Symbolic link\|Empty file'

   Doing clamcan on / generates lot of errors such as:

   Total errors: 27224

5. To avoid errors while scanning / exclude /dev, /sys and /proc from scan using

   clamscan -o --recursive  --exclude='^/proc/.*' --exclude='^/sys/.*' --exclude='^/dev/.*' / 2>&1 | grep -v 'Symbolic link\|Empty file\|: Excluded$'

Test antivirus functionality

To validate whether antivirus scanning is really working or not, use:

1. Install wget and download a virus file in /root folder

   dnf -y install wget
   cd /root/
   wget https://www.ikarussecurity.com/wp-content/downloads/eicar_com.zip

   The above command downloads virus zip file. So it may not work if the same is blocked by some other security mechanism

2. Scan /root folder for virus using

   clamscan -o --recursive /root/ 2>&1 | grep -v 'Symbolic link\|Empty file'

To perform daily scans add appropriate script in /etc/cron.daily with required commands and execute permissions

Refer:

• https://www.2daygeek.com/install-configure-clamav-antivirus-on-linux/

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