@ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
SETLOCAL ENABLEEXTENSIONS

::Generate and implement a random MAC address
FOR /F "tokens=1" %%a IN ('wmic nic where physicaladapter^=true get deviceid ^| findstr [0-9]') DO (
CALL :MAC
FOR %%b IN (0 00 000) DO (
REG QUERY HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a >NUL 2>NUL && REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a /v NetworkAddress /t REG_SZ /d !MAC! /f >NUL 2>NUL
)
)

::Disable power saving mode for network adapters
FOR /F "tokens=1" %%a IN ('wmic nic where physicaladapter^=true get deviceid ^| findstr [0-9]') DO (
FOR %%b IN (0 00 000) DO (
REG QUERY HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a >NUL 2>NUL && REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\%%b%%a /v PnPCapabilities /t REG_DWORD /d 24 /f >NUL 2>NUL
)
)

::Reset NIC adapters so the new MAC address is implemented and the power saving mode is disabled.
FOR /F "tokens=2 delims=, skip=2" %%a IN ('"wmic nic where (netconnectionid like '%%') get netconnectionid,netconnectionstatus /format:csv"') DO (
netsh interface set interface name="%%a" disable >NUL 2>NUL
netsh interface set interface name="%%a" enable >NUL 2>NUL
)

GOTO :EOF
:MAC
::Generates semi-random value of a length according to the "if !COUNT!" line, minus one, and from the characters in the GEN variable
SET COUNT=0
SET GEN=ABCDEF0123456789
SET GEN2=26AE
SET MAC=
:MACLOOP
SET /a COUNT+=1
SET RND=%random%
::%%n, where the value of n is the number of characters in the GEN variable minus one. So if you have 15 characters in GEN, set the number as 14
SET /A RND=RND%%16
SET RNDGEN=!GEN:~%RND%,1!
SET /A RND2=RND%%4
SET RNDGEN2=!GEN2:~%RND2%,1!
IF "!COUNT!" EQU "2" (SET MAC=!MAC!!RNDGEN2!) ELSE (SET MAC=!MAC!!RNDGEN!)
IF !COUNT! LEQ 11 GOTO MACLOOP