Identify Managed AD Security Groups

modules/post/windows/gather/enum_ad_managedby_groups.rb

@@ -0,0 +1,112 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'rex'
+require 'msf/core'
+
+class Metasploit3 < Msf::Post
+  include Msf::Auxiliary::Report
+  include Msf::Post::Windows::LDAP
+
+  USER_FIELDS = ['cn',
+                 'distinguishedname',
+                 'managedBy',
+                 'description'].freeze
+
+  def initialize(info = {})
+    super(update_info(
+      info,
+      'Name'         => 'Windows Gather Active Directory Managed Groups',
+      'Description'  => %{
+        This module will enumerate AD groups on the specified domain which are specifically managed.
+        It cannot at the moment identify whether the 'Manager can update membership list' option
+        option set; if so, it would allow that member to update the contents of that group. This
+        could either be used as a persistence mechanism (for example, set your user as the 'Domain
+        Admins' group manager) or could be used to detect privilege escalation opportunities
+        without having domain admin privileges.
+      },
+      'License'      => MSF_LICENSE,
+      'Author'       => [
+        'Stuart Morgan <stuart.morgan[at]mwrinfosecurity.com>'
+      ],
+      'Platform'     => [ 'win' ],
+      'SessionTypes' => [ 'meterpreter' ]
+    ))
+
+    register_options([
+      OptString.new('ADDITIONAL_FIELDS', [false, 'Additional group fields to retrieve, comma separated.', nil]),
+      OptBool.new('RESOLVE_MANAGERS', [true, 'Query LDAP to get the account name of group managers.', TRUE]),
+      OptBool.new('SECURITY_GROUPS_ONLY', [true, 'Only include security groups.', TRUE])
+    ], self.class)
+  end
+
+  def run
+    @user_fields = USER_FIELDS.dup
+
+    if datastore['ADDITIONAL_FIELDS']
+      additional_fields = datastore['ADDITIONAL_FIELDS'].gsub(/\s+/, "").split(',')
+      @user_fields.push(*additional_fields)
+    end
+
+    max_search = datastore['MAX_SEARCH']
+
+    begin
+      qs = '(&(objectClass=group)(managedBy=*))'
+      if datastore['SECURITY_GROUPS_ONLY']
+        qs = '(&(objectClass=group)(managedBy=*)(groupType:1.2.840.113556.1.4.803:=2147483648))'
+      end
+      q = query(qs, max_search, @user_fields)
+    rescue ::RuntimeError, ::Rex::Post::Meterpreter::RequestError => e
+      # Can't bind or in a network w/ limited accounts
+      print_error(e.message)
+      return
+    end
+
+    if q.nil? || q[:results].empty?
+      print_status('No results returned.')
+    else
+      @user_fields << 'Manager Account Name' if datastore['RESOLVE_MANAGERS']
+      results_table = parse_results(q[:results])
+      print_line results_table.to_s
+    end
+  end
+
+  # Takes the results of LDAP query, parses them into a table
+  def parse_results(results)
+    results_table = Rex::Ui::Text::Table.new(
+      'Header'     => "Groups with Managers",
+      'Indent'     => 1,
+      'SortIndex'  => -1,
+      'Columns'    => @user_fields
+    )
+
+    results.each do |result|
+      row = []
+
+      result.each do |field|
+        if field.nil?
+          row << ""
+        else
+          row << field[:value]
+        end
+      end
+      if datastore['RESOLVE_MANAGERS']
+        begin
+          managedby_cn = result[2][:value].split(/,(?<!\\,)/)[0]
+          m = query("(&(objectClass=user)(objectCategory=person)(#{managedby_cn}))", 1, ['sAMAccountName'])
+          if !m.nil? && !m[:results].empty?
+            row << m[:results][0][0][:value]
+          else
+            row << ""
+          end
+        rescue
+          row << ""
+        end
+      end
+      results_table << row
+    end
+    results_table
+  end
+end