File: 1437.txt

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Rule:

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Sid:
1437

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Summary:
This event is generated when network traffic indicating the use of a
multimedia application is detected.

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Impact:
This may be a violation of corporate policy since these applications can
be used to bypass security measures designed to restrict the flow of
corporate information to destinations external to the corporation.

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Detailed Information:
Multimedia client applications can be used to view movies and listen to
music files. Some also include file sharing facilities. Use of these
programs may constitute a violation of company policy.

Clients may also contain vulnerabilities that can give an attacker an
attack vector for delivering Trojan horse programs and viruses.

This rule detects the following Windows Media file types:

  File extension   MIME type
     .wmz        application/x-ms-wmz
     .wmd        application/x-ms-wmd
     .wma        audio/x-ms-wma
     .wax        audio/x-ms-wax
     .wmv        audio/x-ms-wmv
     .asf        video/x-ms-asf
     .asx        video/x-ms-asf
     .wvx        video/x-ms-wvx
     .wm         video/x-ms-wm
     .wmx        video/x-ms-wmx

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Affected Systems:
	All Windows systems running Windows Media player applications

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Attack Scenarios:
A user can download files from a source external to the protected
network that may contain malicious code hidden in the file giving an
attacker the opportunity to gain access to a host inside the protected
network.

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Ease of Attack:
Simple.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

Microsoft Windows Media file types:
http://support.microsoft.com/default.aspx?scid=kb;en-us;288102

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