apt-get install clamav clamav-daemon

nano /etc/clamav/freshclam.conf

et augmenter les timeouts

#ConnectTimeout 30
ConnectTimeout 50
#ReceiveTimeout 0
ReceiveTimeout 300
TestDatabases yes 

# nano /etc/cron.d/ClamAV-AG
#lancer le scan ClamAV à 1h00 du matin
00 1 * * * root /root/ClamAV/run_clamav_scan.sh