diff --git a/install_amavis.sh b/install_amavis.sh
index 3129788..847ce83 100755
--- a/install_amavis.sh
+++ b/install_amavis.sh
@@ -128,6 +128,25 @@ DEFAULT_SI_AUTHORISATION_SIGNATURE_WF=76ed7ca6670dbee497e1a0397a7e178c4caa25888b
 #DEFAULT_SI_AUTHORISATION_SIGNATURE_OOPEN=b0b7e94d3fcc8f3b1f128edd5830392361868cf0174723a9924ac25bf8b1b588cb974b50234e1bc1d9839dfe0ca6e1627733d90daf1399347b1046d20c2e3a89
 DEFAULT_SI_AUTHORISATION_SIGNATURE_OOPEN=abb4ec6b194639f3d123154f1b971843a3b8751d8c1bcdc7d07ed6db26621b11bca0e23d2a42b60aef3f7b7803a1466a964d90c7b1e82d67c7680c8f46b59a4e
 
+# SecuriteInfo signatur databases
+#
+SI_SIGNATUR_DATABASES="
+   securiteinfo.hdb 
+   securiteinfo.ign2
+   javascript.ndb
+   spam_marketing.ndb
+   securiteinfohtml.hdb
+   securiteinfoascii.hdb
+   securiteinfoandroid.hdb
+   securiteinfoold.hdb
+   securiteinfopdf.hdb
+   securiteinfo0hour.hdb
+   securiteinfo.mdb
+   securiteinfo.yara
+   securiteinfo.pdb
+   securiteinfo.wdb
+"
+
 # - This parameter will be not asked, so setting it here
 # -
 QUARANTINE_ADMIN=$DEFAULT_QUARANTINE_ADMIN
@@ -2936,6 +2955,50 @@ else
 	[[ $OK = "yes" ]] || fatal "Abbruch durch User"
 fi
 
+echononl "   Add SecuriteInfo signatur databases to freshclam.conf"
+if $SECURITE_INFO_IN_USE ; then
+
+   if [[ -f "/etc/clamav/freshclam.conf" ]] ; then
+
+      _done=false
+      for signatur_database in $SI_SIGNATUR_DATABASES do
+
+         if ! $(grep -q -E "DatabaseCustomURL\s+https://www.securiteinfo.com.*${signatur_database}" "/etc/clamav/freshclam.conf" 2>/dev/null) ; then
+
+            echo "DatabaseCustomURL https://www.securiteinfo.com/get/signatures/${SI_AUTHORISATION_SIGNATURE}/${signatur_database}" >> /etc/clamav/freshclam.conf
+
+            _done=true
+
+         fi
+
+      done
+
+      if $_done ; then
+         echo_ok
+      else
+         echo_skipped
+      fi
+
+   else
+
+      echo_failed
+      error "Cannot find freshclam configuration file '/etc/clamav/freshclam.conf'!"
+
+      echononl "continue anyway [yes/no]: "
+      read OK
+      OK="$(echo "$OK" | tr '[:upper:]' '[:lower:]')"
+      while [[ "$OK" != "yes" ]] && [[  "$OK" != "no" ]] ; do
+         echononl "Wrong entry! - repeat [yes/nno]: "
+         read OK
+      done
+      [[ $OK = "yes" ]] || fatal "Abbruch durch User"
+
+   fi # if [[ -f "/etc/clamav/freshclam.conf" ]] ; then
+
+else
+   echo_skipped
+fi
+
 echononl "   Start ClamAv daemon.."
 if $systemd_exists ; then
    systemctl start clamav-daemon > /dev/null 2> $tmp_err_msg