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Attachment detection by Cyren Premium AntiVirus

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The Cyren Premium AntiVirus scanner is part of the Malware Scanner action and can be used if NoSpamProxy Protection is licensed. Cyren Premium AntiVirus checks attachments that are attached to an email. In doing so, it carries out two basic checks:

  • Local checks against definitions
    • The definitions are regularly downloaded from the Cyren servers. In case of access problems to the Cyren servers, the definitions must not be older than two days.
    • During the check, the attachment is placed in the directory C:\ProgramData\Net at Work Mail Gateway\Cyren\Temp, checked and deleted again.
  • Live checks – Zero Hour Protection
    • Check for conspicuous attachments in the recent past. A hash value is generated and sent to Cyren, which then sends a response with the corresponding classification by Cyren.

Unlike with the Cyren AntiSpam filter, the NoSpamProxy support has no way of influencing this behaviour in the case of a misclassification.
In the case of misclassifications – i.e. false positives or false negatives – the sender or the recipient of the email must always contact Cyren and have this corrected accordingly.

A description of the process can be found on the respective Cyren support page.

In case of local problems or missing definitions, please refer to the Knowledge Base article Cyren Engines – Troubleshooting

Note

To ensure parallel operation with other locally installed virus scanners on the gateway role, please refer to the Knowledge Base article How to configure on-access virus scanners and define the exceptions as described!

Further information

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Cyren Engines – Troubleshooting

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It is possible that the Cyren engines used generate error messages that are not traceable to the engines themselves, but to communication problems with Cyren data centers. This article shows you ways to test the communication and function.

Details about the three Cyren engines in NoSpamProxy

NoSpamProxy currently has three Cyren engines that are active, depending on the configuration and licensed modules.

Cyren AntiSpam and Cyren Premium AntiVirus (ctasd)

  • Program folder: C:\Program Files\Net at Work Mail Gateway\Cyren Integration Service
  • Program file: ctasd.exe
  • Configuration folder: C:\ProgramData\Net at Work Mail Gateway\Cyren
  • Configuration file: ctasd.conf
  • Service name: NetatworkMailGatewayCyrenService
  • Service display name: NoSpamProxy – CYREN Service
  • Definitions folder: C:\ProgramData\Net at Work Mail Gateway\Cyren\Definitions
  • Definitions files: aivsecon-v2.def, antivir-v2.def, antivir-v2.ini, antivir-v2-hit.ini
    • these four files should always be in the directory
    • The file “antivir-v2-hit.ini” should never be older than 2 hours
    • To re-update,restart the service
  • External access: resolver1.netat.ctmail.com, resolver [2…5] .netat.ctmail.com
  • Licensed Module: NoSpamProxy Server Protection, NoSpamProxy Server Suite

Cyren IP Reputation (ctipd)

  • Program folder: C:\Program Files\Net at Work Mail Gateway\Cyren Integration Service
  • Program file: ctipd.exe
  • Configuration folder: C:\ProgramData\Net at Work Mail Gateway\Cyren
  • Configuration file: ctipd.conf
  • Service Name: NetatworkMailGatewayCyrenIpReputationService
  • Service Display Name: NoSpamProxy – CYREN IP Reputation Service
  • External access: Iprep1.t.ctmail.com,Iprep[2… 5]. t.ctmail.com
  • Licensed Module: NoSpamProxy Server Protection, NoSpamProxy Server Suite

Cyren URL Categorization (ctwsd)

  • Program folder: C:\Program Files\Net at Work Mail Gateway\Cyren Integration Service
  • Program file: ctwsd.exe
  • Configuration folder: C:\ProgramData\Net at Work Mail Gateway\Cyren
  • Configuration file: ctwsd.conf
  • Service Name: NetatworkMailGatewayCyrenUrlService
  • Service Display Name: NoSpamProxy – CYREN URL Categorization Service
  • External access: webres1.t.ctmail.com,webres[2… 5]. t.ctmail.com
  • Licensed Module: NoSpamProxy Server Protection, NoSpamProxy Server Suite

Note: All paths are the default paths and may differ from your installation.

Troubleshooting

In the following section you will find a small checklist, which you should always check before the first request to the support

  • Is the necessary module licensed in NoSpamProxy? If not, you don’t need the services and can disable them on the system in the Windows services.
  • Has the Knowledge Base article How to configure on-access virus scanners been applied to all systems with the appropriate services?
  • Is a web proxy required for Internet communication in your company and is it registered according to the knowledge base article How to configure CYREN services?
    • This must be checked and re-entered after each NoSpamProxy Update/Upgrade.
    • Always edit the newly created file, never overwrite it with an old version of the file.
  • Is it possible to communicate with and/or without web proxy to all mentioned external systems of Cyren?
  • Are there any exceptions on the firewall to access all sub-domains from ctmail.com? These connections must not be used for virus scanning, content filtering, or other checks!
  • Are there any error messages when the services are running interactively via the command prompt (CMD)? To run interactively, please follow these steps aus and attach a screenshot of the request’s communication to support.
    1. Stop each service from Microsoft Windows services.
    2. Open a prompt with administrator privileges.
    3. Run the command for the service, to be tested. Use the path to the corresponding executable if you do not have NoSpamProxy installed in the default directory
      • Ctasd
        CMD > “C:\Program Files\Net at Work Mail Gateway\Cyren Integration Service\ctasd.exe” -c “C:\ProgramData\Net at Work Mail Gateway\Cyren-ctasd.conf” -i
      • Ctipd
        CMD > “C:\Program Files\Net at Work Mail Gateway\Cyren Integration Service\ctipd.exe” -c “C:\ProgramData\Net at Work Mail Gateway\Cyren-ctipd.conf” -i
      • Ctwsd
        CMD > “C:\Program Files”Net at Work Mail Gateway\Cyren Integration Service\ctwsd.exe” -c “C:\ProgramData\Net at Work Mail Gateway\Cyren-ctwsd.conf” -i
    4. Copy the output or take a screenshot of the output.

If you have checked all these points, please open a support ticket with the information attached so that more logs can be created for analysis.

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How to configure CYREN services

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Configuring the CYREN Services for use with a Web Proxy

This article describes how to configure a proxy server for the CYREN services with the Protection module in all NoSpamProxy versions from version 9.2 onwards. To do this you have to download the files

  • ctasd.conf
  • ctipd.conf (additionally available from version 12.x)
  • ctwsd.conf (additionally available as of version 13.x)

from the directory “C:\ProgramData\Net at Work Mail Gateway\CYREN\”.

The following section is responsible for this:

#   If you connect to the Internet through a proxy server, you
#   should uncomment the following parameters and assign appropriate
#   values.
#ProxyPort = 80
#ProxyServerAddress = myproxy
#ProxyAuth = NoAuth
#ProxyUserName = user@proxy
#ProxyPassword = 1234
#ProxyAccess = 1

If you are using a proxy server without authentication, remove the # character before the lines “ProxyPort”, “ProxyServerAddress”, “ProxyAuth” and “ProxyAccess”. Enter the corresponding port of your proxy server in ” ProxyPort”. Behind the entry “ProxyServerAddress” you configure either the IP address or the FQDN of your proxy server. For “ProxyAuth” leave the entry at “NoAuth”.

If you are using a proxy server with authentication, you must additionally configure the options “ProxyUserName” and “ProxyPassword”. Enter the corresponding logon information for “ProxyUserName” and “ProxyPassword”. Additionally, you must change the value “ProxyAuth” to “Basic”.

After you have saved the file, you must restart the services NoSpamProxy – CYREN Service (ctasd.conf), NoSpamProxy – CYREN IP Reputation Service (ctipd.conf) and NoSpamProxy – CYREN URL Categorization Service (ctwsd.conf) in order for the changes to take effect.

Note

In order for all Cyren services to function properly, unrestricted access to *.ctmail.com must be given. Also a virus scan on these connections must not be done, because the definitions for the Cyren Premium AntiVirus are downloaded there as well!

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NoSpamProxy Software Archive

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Here you can find all versions that are required to upgrade to the current version. When upgrading, be sure to follow the installation and upgrade instructions for the respective version, as you may need to make manual changes. Also note that changes that you must make when upgrading from version 7.6 to 8.0, for example, are also required for a direct upgrade from 7.6 to 8.5.

The current version is available under Software Download.

Microsoft Report Viewer

Since the download has been officially discontinued, but it is needed for setups up to NoSpamProxy version 13.2 you can download it here

13.1 (Schneller Kanal)
13.1 (Regulärer Kanal)
13.0 (Schneller Kanal)
13.0 (Regulärer Kanal)
12.2 (Schneller Kanal)
12.2 (Regulärer Kanal)
12.1 (Fast Channel)
12.1 (Regular Channel)
12.0
11.1
11.0
10.1
9.2
8.5

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Collection of popular LDAP directories including configuration settings

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Below you will find a number of popular key servers operated by established manufacturers, along with the corresponding settings for the integration in NoSpamProxy.

These directories are automatically queried via the Open Keys server.

Provider: A trust
Hostname: ldap.a-trust.at:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: Arbeitsagentur (For further information about this LDAP server please contact us: IT-Systemhaus.Vertrauensdienste@arbeitsagentur.de)
Hostname: cert-download.arbeitsagentur.de:389
Registration: CN=Username,OU=BA,O=Bundesagentur für Arbeit,C=de
LDAP search: In container OU=BA,O=Bundesagentur für Arbeit,C=de on (mail=%e)
LDAP fields: userCertificate;binary

Supplier: Federal Office for IT Security
Hostname: x500.bund.de:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: D-TRUST
Hostname: directory.d-trust.net:389
Registration: Anonymous
LDAP search: In container c=de on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: Datev
Hostname: ldap.crl.esecure.datev.de:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: DFN
Hostname: ldap.pca.dfn.de:389
Registration: Anonymous
LDAP search: In the container with the base DN: o=DFN-Verein,c=DE search for (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: S Trust
Hostname: directory.s-trust.de:389
Registration: Anonymous
LDAP search: In container dc=s-trust,dc=de on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: Siemens PKI
Hostname: cl.siemens.com:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: T-Systems Mailpass
Hostname: ldap.t-mailpass.de:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: DigiCert, Inc
Hostname: ldap://directory.pki.digicert.com:389
Registration: Anonymous
LDAP Search: Unlimited search on (mail=%e)
LDAP Fields: userCertificate;binary

Supplier: SwissSign AG
Hostname: directory.swisssign.net:389
Registration: Anonymous
LDAP search: In container o=SwissSign,c=CH on (mail=%e)
LDAP Fields: userCertificate;binary

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How to debug high processor load

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This article describes how you can use the debugging tools to create log files for the analysis of high processor loads, which can then be evaluated by NoSpamProxy Support.

First install the Windows debugging tools on the server under high processor load. You can download them at https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/

Then, enter the following command into the command line:

cdb.exe -pv -pn NetatWorkMailGatewayGatewayRole.exe -c ".load C:\Windows\Microsoft.NET\Framework64\v4.0.30319\SOS.dll;!EEStack -ee;qd" > NoSpamProxyStack_%date:~-4.4%%date:~-7.2%%date:~-10.2%_%time:~0.2%%time:~3.2%%time:~6.2%.log


If necessary, replace the NetatWorkMailGatewayGatewayRole.exe process with the process that causes the high processor load. Execute the command several times and then send the resulting log files in zipped form to NoSpamProxy Support.

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Integration of the Web Portal requires a user account

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When integrating the WebPortal into the configuration, the following settings must be observed for various scenarios. These settings are outside the NoSpamProxy but are mandatory for integration.

Scenarios

  • NoSpamProxy WebPortal is operated parallel to the gateway role and/or intranet role on the same system
    The Microsoft KB926642 article must be applied. Method 1 (recommended): Create the Local Security Authority host names that can be referenced in an NTLM authentication request is recommended, especially for production environments. Method 2: Disable the authentication loopback check should only be applied to test environments!
    Note: The articles at Microsoft swap the methods in the English and German versions. Always check the exact description!
  • NoSpamProxy WebPortal is operated on a system in the DMZ / on computer(s) outside the domain
    The Microsoft KB951016 article must be applied

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ASN1 error, not enough memory

Error:

When receiving and decrypting a 5MB email, the email is rejected and the error “ASN1 not enough memory” is displayed. The same error is also displayed in message tracking.

Status:

This problem occurs because a buffer size is not properly increased by the .NET framework. This problem is known to Microsoft and can be fixed with the hotfix below.

Solution:

To resolve this problem, install the following Microsoft hotfix: http://support.microsoft.com/kb/2480994/de

http://support.microsoft.com/kb/2480994/de

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