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Spoof MAC on Windows NT

By: KLC Security Team

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SMAC 1.2: MAC Address Spoofer for Windows 2000, XP, 2003. 
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URL for this article: http://www.klcconsulting.net/change_mac_wnt.htm 

Version 1.0

 

Author: 

Kyle Lai, CISSP, CISA

KLC Consulting, Inc.

klai@klcconsulting.net 

www.klcconsulting.net 

 

How do you change (Spoof) MAC addresses in Windows NT 4.0?

Warning: The following information is provided “AS IS.”  If you have any inputs, please send me an email.

*** Disclaimer: Try these steps at your own risk!!!  These steps would work, but they are not supported in any way by Microsoft.  
*** I will not be responsible for any damages that might occur on your system.
*** DO NOT try this if you are not comfortable with this disclaimer!
 

  1. Goto Start->Run, type "cmd" to goto command prompt

  2. Type "ipconfig /all" and record the MAC address for each network adapter

  3. Goto Start->Run, type "regedit" to bring up registry editor.  Make sure you backup your registry in case you screw up.  If you screw up important registry entries, you may damage your computer system.  Again, MAKE SURE you have a good backup of your registry entry!

  4. Locate "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\<network adapter>\Parameters".  <network adapter> should have subkeys like "xyz0000", "xyz0001", "xyz0002" and so on.

  5. Click on each subkey that starts with "0000" and determine your Ethernet card by looking at "DriverDesc" key.  If it did not match, then goto "0001", "0002" and so on...

  6. Once you got the right NIC card,

    1. Click on dropdown menu Edit->New->String Value.

    2. Name the new string "NetworkAddress" and click OK.

    3. Double-click on the new "NetworkAddress" string and you will be prompted for "Value data"

    4. Enter the new MAC address you want to assign.  The MAC address you enter should be a 12 digit number with NO "-", i.e. "00C095ECB761"

  7. Reboot your system

  8. Verify the new MAC address with "IPCONFIG"

Resources:

SMAC - MAC Address Modifying Utility for Windows 2000/XP/2003

MAC Address Spoofing for Windows 2000 & XP/2003

MAC Address Spoofing for Windows NT 4.0

MAC Address Spoofing for Windows 98/ME

MAC Address Spoofing for Unix/Linux

 

 

 

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