Penetration Testing: Re: NT/IIS decoy

[Michael Katz <mike () procinct com>]

At 12/7/2001 03:52 AM, Taiye Lambo wrote:

> Does anyone know how to hide or mask the identity of a IIS 4.0 or 5.0 
> server such that if a "GET" command is issued following a telnet to the 
> server on port 80, the server will display a different server type so as 
> to hide it's true identity.
> I searched the IIS installation drive using the following strings - 
> Microsoft-IIS/4.0 and Microsoft-IIS/5.0
> The result was a file called w3svc.dll which is aparently the IIS world 
> wide web publishing service, I manually stopped this service, backed up 
> the file and then ammended it to reflect my decoy server type, however, 
> next time I attempt to start the service it failed.
> I have heard of honey pot type program that can also achieve my desired 
> result, but never actually played with one myself.
> Has anyone come across this and does anyone know of any solution for what 
> I am trying to achieve.
Taiye,

With IIS4 on Windows NT 4.0, you can edit the w3svc.dll file using a hex 
editor and change the relevant string to something else.
You cannot do this with IIS 5 on Windows 2000, unless you disable Windows 
File Protection.
However, you can use the tool URLscan (now IIS Lockdown) from Microsoft 
with either IIS4 on NT or IIS5 on Windows 2000, to modify the server header 
response.  According to the documentation: "Also, UrlScan provides the 
administrator with the option of deleting or altering the "Server:" header 
in the response."
You can obtain URLScan from 
http://www.microsoft.com/technet/security/URLScan.asp
Note that URLScan has been integrated into the Lockdown tool previously 
released from MS and is now called the IIS Lockdown Wizard version 2.1.  It 
was released on November 14, 2001.
Michael Katz
mike () procinct com
Procinct Security


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