Antigen 9.0 for Exchange or Antigen 9.0 for SMTP Gateways incorrectly detects a uuencode file as a virus

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When you send an e-mail message that contains a uuencode file attachment, Microsoft Antigen 9.0 for Exchange or Microsoft Antigen 9.0 for SMTP Gateways incorrectly detects the uuencode file as a virus. Additionally, the uuencode file may be deleted depending on the Antigen 9.0 configuration settings.

Note This problem does not occur in earlier versions of Antigen.
This problem occurs because there is no fixed standard for uuencode file creation. Therefore, for security reasons, Antigen 9.0 follows an approach of detection instead of letting the uuencode file pass.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


There are no prerequisites for installing this hotfix.

Restart requirement

This hotfix will stop and then restart the SMTP service and the Microsoft Exchange Information Store service. However, if the services cannot be stopped, or if files are left open, you may have to restart the computer.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Antigen 9.0 for Exchange
File nameFile versionFile sizeDateTimePlatform
Custom.dllNot Applicable58,26419-Jan-200703:24x86
Antigen 9.0 for SMTP Gateways
File nameFile versionFile sizeDateTimePlatform
Custom.dllNot Applicable58,26419-Jan-200703:57x86
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For more information about the terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 928081 - Last Review: 01/15/2015 01:08:37 - Revision: 3.0

  • Microsoft Antigen 9.0 for Exchange
  • Microsoft Antigen for SMTP Gateways
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