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mailcow-dockerized-docs/docs/manual-guides/ClamAV/u_e-clamav-additional_dbs.en.md
DerLinkman a69cfb806f Changes for 2022-08 Update (Amoogust Update)
2022-08-31 14:45:46 +02:00

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Additional Databases for ClamAV

Default ClamAV databases do not have great detection levels, but it can be enhanced with free or paid signature databases.

List of known free databases | As of April 2022

  • SecurityInfo - free ClamAV DBs for testing purposes, required registration after which you can use them from 1 IP
  • InterServer - free to use ClamAV DBs, but they do not fit well for email scanning

Enable SecuriteInfo databases

  1. Sign up for a free account at https://www.securiteinfo.com/clients/customers/signup
  2. You will receive an email to activate your account and then a follow-up email with your login name
  3. Login and navigate to your customer account: https://www.securiteinfo.com/clients/customers/account
  4. Click on the Setup tab
  5. You will need to get your_id from one of the download links, they are individual for every user
  6. Add to data/conf/clamav/freshclam.conf with replaced your_id part:
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/securiteinfo.hdb
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/securiteinfo.ign2
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/javascript.ndb
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/spam_marketing.ndb
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/securiteinfohtml.hdb
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/securiteinfoascii.hdb
DatabaseCustomURL https://www.securiteinfo.com/get/signatures/your_id/securiteinfopdf.hdb

  1. For free SecuriteInfo databases, download speed is limited to 300 kB/s. In data/conf/clamav/freshclam.conf, increase the default ReceiveTimeout 20 value to ReceiveTimeout 90 (time in seconds), otherwise some of the database downloads could fail because of their size.

  2. Adjust data/conf/clamav/clamd.conf to align with next settings:

DetectPUA yes
ExcludePUA PUA.Win.Packer
ExcludePUA PUA.Win.Trojan.Packed
ExcludePUA PUA.Win.Trojan.Molebox
ExcludePUA PUA.Win.Packer.Upx
ExcludePUA PUA.Doc.Packed
MaxScanSize 150M
MaxFileSize 100M
MaxRecursion 40
MaxEmbeddedPE 100M
MaxHTMLNormalize 50M
MaxScriptNormalize 50M
MaxZipTypeRcg 50M
  1. Restart ClamAV container:
docker compose restart clamd-mailcow

Please note:

  • You can't use ExcludePUA and IncludePUA in clamd.conf simultaneously, so please comment any IncludePUA if you uncommented them before.
  • List of databases provided in this example fit most use-cases, but SecuriteInfo also provides other databases. Please check SecuriteInfo FAQ for additional information.
  • With the current DB set (including default DBs) ClamAV will consume about 1.3Gb of RAM on your server.
  • If you modified message_size_limit in Postfix you need to adapt MaxSize settings in ClamAV as well.

Enable InterServer databases

  1. Add to data/conf/clamav/freshclam.conf:
DatabaseCustomURL http://sigs.interserver.net/interserver256.hdb
DatabaseCustomURL http://sigs.interserver.net/interservertopline.db
DatabaseCustomURL http://sigs.interserver.net/shell.ldb
DatabaseCustomURL http://sigs.interserver.net/whitelist.fp
  1. Restart ClamAV container:
docker compose restart clamd-mailcow