If you want to have more secure server against viruses, rootkits, trojans and other type of malware, I recommend these three packages:
ClamAv (Anti-virus)
# Install: sudo apt-get install clamav # Update: freshclam # Scan: clamscan –r /
MalDet (Anti-Malware)
# Install: wget http://www.rfxn.com/downloads/maldetect-current.tar.gz tar -zxvf maldetect-current.tar.gz; rm -rf maldetect-current.tar.gz; cd maldetect-1.4.2/ ./install.sh # Scan: maldet -a /home/ # Run it real-time: maldet --monitor users
chkrootkit (Anti-rootkit)
#Install: wget ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz tar xvfz chkrootkit.tar.gz cd chkrootkit-0.47 make sense # Run: sudo ./chkrootkit