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Cannot block compressed file under archived files in InterScan Messaging Security Suite (IMSS)

    • Updated:
    • 3 Mar 2015
    • Product/Version:
    • InterScan Messaging Security Suite 7.0 Windows
    • InterScan Messaging Security Suite 7.1 Windows
    • InterScan Messaging Security Suite 7.5 Windows
    • Platform:
    • Windows 2000 Advanced Server
    • Windows 2000 Server
    • Windows 2003 Enterprise
    • Windows 2003 Server R2
    • Windows 2003 Standard
    • Windows 2008 Enterprise
    • Windows 2008 Server R2
    • Windows 2008 Standard
    • Windows 2012 Server Essentials
Summary

The compressed file under archived files contains items that should be excluded. However, IMSS missed the scanning of the contents. 

The following logs are shown in the log.imss.<date>.<count> file: 

[NORMAL]scan content error:0xffffffff
[NORMAL]emanager filter getFilterNo error:-1

Details
Public

By default, IMSS scans the archived files. The issue occurs because the following keys in the imss.ini file disable the scanning function:

MaxDeComposeDepth=0
AllowDecompressDepthZero=yes

Both keys are supposedly added only to bypass scanning the archived files.

To solve the issue, do the following:

  1. Open C:\Program Files\Trend Micro\IMSS\config\imss.ini using a text editor such as Notepad.
  2. Comment the following keys under the general section:

    [general]
    MaxDeComposeDepth=0
    AllowDecompressDepthZero=yes

    The result should be similar to the following:

    [general]
    #MaxDeComposeDepth=0
    #AllowDecompressDepthZero=yes

  3. Save the changes.
  4. Restart the Trend Micro IMSS Scan Service.
  5. Verify the new settings by sending an email with a compressed file with no password protection. The file type should be included in the block attachment policy.

The contents of the compressed file that IMSS needs to block should now be excluded.

Premium
Internal
Rating:
Category:
Troubleshoot
Solution Id:
1107810
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