Rule:

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Sid:
2470

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Summary:
This event is generated when an attempt is made to access the C$ default
administrative share of a Windows host.

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Impact:
Serious. Possible administrator access to the host. Information 
disclosure.

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Detailed Information:
By default, Windows hosts have default administrative shares of the 
local hard drives using the format %DRIVE_LETTER% + $. Anybody with 
administrative rights can remotely access the share.

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Affected Systems:
	Windows hosts.

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Attack Scenarios:
An attacker may be attempting to access files located on the C drive of 
the host.

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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:
Disallow Netbios access from external networks (tcp port 139).

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Contributors:
Original Rule Writer Unknown
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Josh Sakofsky

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Additional References:

Arachnids:
http://www.whitehats.com/info/IDS339

Microsoft:
http://support.microsoft.com/default.aspx?scid=kb;en-us;100517

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