termsrv_rdp_patch.ps1

# Stop RDP service, make a backup of the termsrv.dllfile and change the permissions
Stop-Service UmRdpService -Force
Stop-Service TermService -Force
$termsrv_dll_acl = Get-Acl c:\windows\system32\termsrv.dll
Copy-Item c:\windows\system32\termsrv.dll c:\windows\system32\termsrv.dll.copy
takeown /f c:\windows\system32\termsrv.dll
$new_termsrv_dll_owner = (Get-Acl c:\windows\system32\termsrv.dll).owner
cmd /c "icacls c:\windows\system32\termsrv.dll /Grant $($new_termsrv_dll_owner):F /C"
# search for a pattern in termsrv.dll file
$dll_as_bytes = Get-Content c:\windows\system32\termsrv.dll -Raw -Encoding byte
$dll_as_text = $dll_as_bytes.forEach('ToString', 'X2') -join '
$patternregex = ([regex]'39 81 3C 06 00 00(\s\S\S){6}')
$patch = 'B8 00 01 00 00 89 81 38 06 00 00 90'
$checkPattern=Select-String -Pattern $patternregex -InputObject $dll_as_text
If ($checkPattern -ne $null) {
$dll_as_text_replaced = $dll_as_text -replace $patternregex, $patch
}
Elseif (Select-String -Pattern $patch -InputObject $dll_as_text) {
Write-Output 'The termsrv.dll file is already patch, exitting'
Exit
}
else {
Write-Output “Pattern not found”
}
# patching termsrv.dll
[byte[]] $dll_as_bytes_replaced = -split $dll_as_text_replaced -replace '^', '0x'
Set-Content c:\windows\system32\termsrv.dll.patched -Encoding Byte -Value $dll_as_bytes_replaced
# comparing two files
fc.exe /b c:\windows\system32\termsrv.dll.patched c:\windows\system32\termsrv.dll
# replacing the original termsrv.dll file
Copy-Item c:\windows\system32\termsrv.dll.patched c:\windows\system32\termsrv.dll -Force
Set-Acl c:\windows\system32\termsrv.dll $termsrv_dll_acl
Start-Service UmRdpService
Start-Service TermService