diff --git a/core/main/handlers/modules/legacybeefjs.rb b/core/main/handlers/modules/legacybeefjs.rb
new file mode 100644
index 000000000..f291471c5
--- /dev/null
+++ b/core/main/handlers/modules/legacybeefjs.rb
@@ -0,0 +1,186 @@
+#
+# Copyright (c) 2006-2020 Wade Alcorn - wade@bindshell.net
+# Browser Exploitation Framework (BeEF) - http://beefproject.com
+# See the file 'doc/COPYING' for copying permission
+#
+module BeEF
+  module Core
+    module Handlers
+      module Modules
+
+        # @note Purpose: avoid rewriting several times the same code.
+        module BeEFJS
+
+          # Builds the default beefjs library (all default components of the library).
+          # @param [Object] req_host The request object
+          def build_beefjs!(req_host)
+            config = BeEF::Core::Configuration.instance
+            # @note set up values required to construct beefjs
+            beef_js = ''
+            # @note location of sub files
+            beef_js_path = "#{$root_dir}/core/main/client/"
+
+            # @note External libraries (like jQuery) that are not evaluated with Eruby and possibly not obfuscated
+            ext_js_sub_files = %w(lib/jquery-1.12.4.min.js lib/jquery-migrate-1.4.1.js lib/evercookie.js lib/json2.js lib/mdetect.js lib/platform.js lib/jquery.blockUI.js)
+
+            # @note BeEF libraries: need Eruby evaluation and obfuscation
+            beef_js_sub_files = %w(beef.js browser.js browser/cookie.js browser/popup.js session.js os.js hardware.js dom.js logger.js net.js updater.js encode/base64.js encode/json.js net/local.js init.js mitb.js geolocation.js net/dns.js net/connection.js net/cors.js net/requester.js net/xssrays.js net/portscanner.js are.js)
+            # @note Load websocket library only if WS server is enabled in config.yaml
+            if config.get("beef.http.websocket.enable") == true
+              beef_js_sub_files << "websocket.js"
+            end
+            # @note Load webrtc library only if WebRTC extension is enabled
+            if config.get("beef.extension.webrtc.enable") == true
+              beef_js_sub_files << "lib/webrtcadapter.js"
+              beef_js_sub_files << "webrtc.js"
+            end
+
+            # @note antisnatchor: leave timeout.js as the last one!
+            beef_js_sub_files << "timeout.js"
+
+            ext_js_to_obfuscate = ''
+            ext_js_to_not_obfuscate = ''
+
+            # @note If Evasion is enabled, the final ext_js string will be ext_js_to_obfuscate + ext_js_to_not_obfuscate
+            # @note If Evasion is disabled, the final ext_js will be just ext_js_to_not_obfuscate
+            ext_js_sub_files.each { |ext_js_sub_file|
+              if config.get("beef.extension.evasion.enable")
+                if config.get("beef.extension.evasion.exclude_core_js").include?(ext_js_sub_file)
+                  print_debug "Excluding #{ext_js_sub_file} from core files obfuscation list"
+                  # do not obfuscate the file
+                  ext_js_sub_file_path = beef_js_path + ext_js_sub_file
+                  ext_js_to_not_obfuscate << (File.read(ext_js_sub_file_path) + "\n\n")
+                else
+                  ext_js_sub_file_path = beef_js_path + ext_js_sub_file
+                  ext_js_to_obfuscate << (File.read(ext_js_sub_file_path) + "\n\n")
+                end
+              else
+                # Evasion is not enabled, do not obfuscate anything
+                ext_js_sub_file_path = beef_js_path + ext_js_sub_file
+                ext_js_to_not_obfuscate << (File.read(ext_js_sub_file_path) + "\n\n")
+              end
+            }
+
+            # @note construct the beef_js string from file(s)
+            beef_js_sub_files.each { |beef_js_sub_file|
+              beef_js_sub_file_path = beef_js_path + beef_js_sub_file
+              beef_js << (File.read(beef_js_sub_file_path) + "\n\n")
+            }
+
+            # @note create the config for the hooked browser session
+            hook_session_config = BeEF::Core::Server.instance.to_h
+
+            # @note if http_host="0.0.0.0" in config ini, use the host requested by client
+            unless hook_session_config['beef_public'].nil?
+              if hook_session_config['beef_host'] != hook_session_config['beef_public']
+                hook_session_config['beef_host'] = hook_session_config['beef_public']
+                hook_session_config['beef_url'].sub!(/#{hook_session_config['beef_host']}/, hook_session_config['beef_public'])
+              end
+            end
+            if hook_session_config['beef_host'].eql? "0.0.0.0"
+              hook_session_config['beef_host'] = req_host
+              hook_session_config['beef_url'].sub!(/0\.0\.0\.0/, req_host)
+            end
+
+            # @note set the XHR-polling timeout
+            hook_session_config['xhr_poll_timeout'] = config.get("beef.http.xhr_poll_timeout")
+
+            # @note set the hook file path and BeEF's cookie name
+            hook_session_config['hook_file'] = config.get("beef.http.hook_file")
+            hook_session_config['hook_session_name'] = config.get("beef.http.hook_session_name")
+
+            # @note if http_port <> public_port in config ini, use the public_port
+            unless hook_session_config['beef_public_port'].nil?
+              if hook_session_config['beef_port'] != hook_session_config['beef_public_port']
+                hook_session_config['beef_port'] = hook_session_config['beef_public_port']
+                hook_session_config['beef_url'].sub!(/#{hook_session_config['beef_port']}/, hook_session_config['beef_public_port'])
+                if hook_session_config['beef_public_port'] == '443'
+                  hook_session_config['beef_url'].sub!(/http:/, 'https:')
+                end
+              end
+            end
+
+            # @note Set some WebSocket properties
+            if config.get("beef.http.websocket.enable")
+              hook_session_config['websocket_secure'] = config.get("beef.http.websocket.secure")
+              hook_session_config['websocket_port'] = config.get("beef.http.websocket.port")
+              hook_session_config['ws_poll_timeout'] = config.get("beef.http.websocket.ws_poll_timeout")
+              hook_session_config['ws_connect_timeout'] = config.get("beef.http.websocket.ws_connect_timeout")
+              hook_session_config['websocket_sec_port']= config.get("beef.http.websocket.secure_port")
+            end
+
+            # @note Set if PhishingFrenzy integration is enabled
+            if config.get("beef.integration.phishing_frenzy.enable")
+              hook_session_config['phishing_frenzy_enable'] = config.get("beef.integration.phishing_frenzy.enable")
+            end
+
+            # @note populate place holders in the beef_js string and set the response body
+            eruby = Erubis::FastEruby.new(beef_js)
+            @hook = eruby.evaluate(hook_session_config)
+
+            if config.get("beef.extension.evasion.enable")
+              evasion = BeEF::Extension::Evasion::Evasion.instance
+              @final_hook = ext_js_to_not_obfuscate + evasion.add_bootstrapper + evasion.obfuscate(ext_js_to_obfuscate + @hook)
+            else
+              @final_hook = ext_js_to_not_obfuscate + @hook
+            end
+
+            # @note Return the final hook to be sent to the browser
+            @body << @final_hook
+
+          end
+
+          # Finds the path to js components
+          # @param [String] component Name of component
+          # @return [String|Boolean] Returns false if path was not found, otherwise returns component path
+          def find_beefjs_component_path(component)
+            component_path = component
+            component_path.gsub!(/beef./, '')
+            component_path.gsub!(/\./, '/')
+            component_path.replace "#{$root_dir}/core/main/client/#{component_path}.js"
+
+            return false if not File.exists? component_path
+
+            component_path
+          end
+
+          # Builds missing beefjs components.
+          # @param [Array] beefjs_components An array of component names
+          def build_missing_beefjs_components(beefjs_components)
+            # @note verifies that @beef_js_cmps is not nil to avoid bugs
+            @beef_js_cmps = '' if @beef_js_cmps.nil?
+
+            if beefjs_components.is_a? String
+              beefjs_components_path = find_beefjs_component_path(beefjs_components)
+              raise "Invalid component: could not build the beefjs file" if not beefjs_components_path
+              beefjs_components = {beefjs_components => beefjs_components_path}
+            end
+
+            beefjs_components.keys.each { |k|
+              next if @beef_js_cmps.include? beefjs_components[k]
+
+              # @note path to the component
+              component_path = beefjs_components[k]
+
+              # @note we output the component to the hooked browser
+              config = BeEF::Core::Configuration.instance
+              if config.get("beef.extension.evasion.enable")
+                evasion = BeEF::Extension::Evasion::Evasion.instance
+                @body << evasion.obfuscate(File.read(component_path) + "\n\n")
+              else
+                @body << File.read(component_path) + "\n\n"
+              end
+
+              # @note finally we add the component to the list of components already generated so it does not get generated numerous times.
+              if @beef_js_cmps.eql? ''
+                @beef_js_cmps = component_path
+              else
+                @beef_js_cmps += ",#{component_path}"
+              end
+            }
+          end
+        end
+      end
+    end
+  end
+end