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- -- Actually these regular expressions were obtained from SpamAssassin project, so they are licensed by apache license:
- --
- -- Licensed to the Apache Software Foundation (ASF) under one or more
- -- contributor license agreements. See the NOTICE file distributed with
- -- this work for additional information regarding copyright ownership.
- -- The ASF licenses this file to you under the Apache License, Version 2.0
- -- (the "License"); you may not use this file except in compliance with
- -- the License. You may obtain a copy of the License at:
- --
- -- http://www.apache.org/licenses/LICENSE-2.0
- --
- -- Unless required by applicable law or agreed to in writing, software
- -- distributed under the License is distributed on an "AS IS" BASIS,
- -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- -- See the License for the specific language governing permissions and
- -- limitations under the License.
- --
- -- Definitions of header regexps
-
- local reconf = config['regexp']
-
- -- Subject needs encoding
- -- Define encodings types
- local subject_encoded_b64 = 'Subject=/=\\?\\S+\\?B\\?/iX'
- local subject_encoded_qp = 'Subject=/=\\?\\S+\\?Q\\?/iX'
- -- Define whether subject must be encoded (contains non-7bit characters)
- local subject_needs_mime = 'Subject=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
- -- Final rule
- reconf['SUBJECT_NEEDS_ENCODING'] = {
- re = string.format('!(%s) & !(%s) & (%s)', subject_encoded_b64, subject_encoded_qp, subject_needs_mime),
- score = 1.0,
- mime_only = true,
- description = 'Subject needs encoding',
- group = 'headers'
- }
-
- local from_encoded_b64 = 'From=/=\\?\\S+\\?B\\?/iX'
- local from_encoded_qp = 'From=/=\\?\\S+\\?Q\\?/iX'
- local raw_from_needs_mime = 'From=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
- reconf['FROM_NEEDS_ENCODING'] = {
- re = string.format('!(%s) & !(%s) & (%s)', from_encoded_b64, from_encoded_qp, raw_from_needs_mime),
- score = 1.0,
- mime_only = true,
- description = 'From header needs encoding',
- group = 'headers'
- }
-
- local to_encoded_b64 = 'To=/=\\?\\S+\\?B\\?/iX'
- local to_encoded_qp = 'To=/=\\?\\S+\\?Q\\?/iX'
- local raw_to_needs_mime = 'To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/X'
- reconf['TO_NEEDS_ENCODING'] = {
- re = string.format('!(%s) & !(%s) & (%s)', to_encoded_b64, to_encoded_qp, raw_to_needs_mime),
- score = 1.0,
- mime_only = true,
- description = 'To header needs encoding',
- group = 'headers'
- }
-
- -- Detects that there is no space in From header (e.g. Some Name<some@host>)
- reconf['R_NO_SPACE_IN_FROM'] = {
- re = 'From=/\\S<[-\\w\\.]+\\@[-\\w\\.]+>/X',
- score = 1.0,
- mime_only = true,
- description = 'No space in From header',
- group = 'headers'
- }
-
- reconf['TO_WRAPPED_IN_SPACES'] = {
- re = [[To=/<\s[-.\w]+\@[-.\w]+\s>/X]],
- score = 2.0,
- mime_only = true,
- description = 'To address is wrapped in spaces inside angle brackets (e.g. display-name < local-part@domain >)',
- group = 'headers'
- }
-
- -- Detects missing Subject header
- reconf['MISSING_SUBJECT'] = {
- re = '!raw_header_exists(Subject)',
- score = 2.0,
- mime_only = true,
- description = 'Subject header is missing',
- group = 'headers'
- }
-
- rspamd_config.EMPTY_SUBJECT = {
- score = 1.0,
- mime_only = true,
- description = 'Subject header is empty',
- group = 'headers',
- callback = function(task)
- local hdr = task:get_header('Subject')
- if hdr and #hdr == 0 then
- return true
- end
- return false
- end
- }
-
- -- Detects missing To header
- reconf['MISSING_TO'] = {
- re = '!raw_header_exists(To)',
- score = 2.0,
- description = 'To header is missing',
- group = 'headers',
- mime_only = true,
- }
-
- -- Detects undisclosed recipients
- reconf['R_UNDISC_RCPT'] = {
- -- match:
- -- To: undisclosed-recipients:;
- -- To: Undisclosed recipients:;
- -- To: undisclosed-recipients: ;
- -- To: <Undisclosed-Recipient:;>
- -- To: <"Undisclosed-Recipient:;">
- -- To: "undisclosed-recipients (utajeni adresati)": ;
- -- To: Undisclosed recipients:
- -- but do not match:
- -- Undisclosed Recipient <user@example.org>
- re = [[To=/^<?"?undisclosed[- ]recipients?\b.*:/i{header}]],
- score = 3.0,
- description = 'Recipients are absent or undisclosed',
- group = 'headers',
- mime_only = true,
- }
-
- -- Detects missing Message-ID
- local has_mid = 'header_exists(Message-Id)'
- reconf['MISSING_MID'] = {
- re = '!header_exists(Message-Id)',
- score = 2.5,
- description = 'Message-ID header is missing',
- group = 'headers',
- mime_only = true,
- }
-
- -- Received seems to be fake
- reconf['R_RCVD_SPAMBOTS'] = {
- re = 'Received=/^from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by [-.\\w+]{5,255}; [SMTWF][a-z][a-z],' ..
- ' [\\s\\d]?\\d [JFMAJSOND][a-z][a-z] \\d{4} \\d{2}:\\d{2}:\\d{2} [-+]\\d{4}$/mH',
- score = 3.0,
- description = 'Spambots signatures in received headers',
- group = 'headers',
- mime_only = true,
- }
-
- -- Charset is missing in message
- reconf['R_MISSING_CHARSET'] = {
- re = string.format('!is_empty_body() & content_type_is_type(text) & content_type_is_subtype(plain) & !content_type_has_param(charset) & !%s',
- 'compare_transfer_encoding(7bit)'),
- score = 0.5,
- description = 'Charset header is missing',
- group = 'headers',
- mime_only = true,
- }
-
- -- Find forged Outlook MUA
- -- Yahoo groups messages
- local yahoo_bulk = 'Received=/from \\[\\S+\\] by \\S+\\.(?:groups|scd|dcn)\\.yahoo\\.com with NNFMP/H'
- -- Outlook MUA
- local outlook_mua = 'X-Mailer=/^Microsoft Outlook\\b/H'
- local any_outlook_mua = 'X-Mailer=/^Microsoft Outlook\\b/H'
- reconf['FORGED_OUTLOOK_HTML'] = {
- re = string.format('!%s & %s & %s', yahoo_bulk, outlook_mua, 'has_only_html_part()'),
- score = 5.0,
- description = 'Forged Outlook HTML signature',
- group = 'headers',
- mime_only = true,
- }
-
- -- Recipients seems to be likely with each other (only works when recipients count is more than 5 recipients)
- reconf['SUSPICIOUS_RECIPS'] = {
- re = 'compare_recipients_distance(0.65)',
- score = 1.5,
- description = 'Recipients seems to be autogenerated (works if recipients count is more than 5)',
- group = 'headers',
- mime_only = true,
- }
-
- -- Recipients list seems to be sorted
- reconf['SORTED_RECIPS'] = {
- re = 'is_recipients_sorted()',
- score = 3.5,
- description = 'Recipients list seems to be sorted',
- group = 'headers',
- mime_only = true,
- }
-
- -- Spam string at the end of message to make statistics faults
- reconf['TRACKER_ID'] = {
- re = '/^[a-z0-9]{6,24}[-_a-z0-9]{12,36}[a-z0-9]{6,24}\\s*\\z/isPr',
- score = 3.84,
- description = 'Spam string at the end of message to make statistics fault',
- group = 'headers',
- mime_only = true,
- }
-
- -- From contains only 7bit characters (parsed headers are used)
- local from_needs_mime = 'From=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
- -- From that contains encoded characters while base 64 is not needed as all symbols are 7bit
- reconf['FROM_EXCESS_BASE64'] = {
- re = string.format('%s & !%s', from_encoded_b64, from_needs_mime),
- score = 1.5,
- description = 'From header is unnecessarily encoded in base64',
- group = 'excessb64',
- mime_only = true,
- }
-
- -- From that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
- reconf['FROM_EXCESS_QP'] = {
- re = string.format('%s & !%s', from_encoded_qp, from_needs_mime),
- score = 1.2,
- description = 'From header is unnecessarily encoded in quoted-printable',
- group = 'excessqp'
- }
-
- -- To contains only 7bit characters (parsed headers are used)
- local to_needs_mime = 'To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
- -- To that contains encoded characters while base 64 is not needed as all symbols are 7bit
- reconf['TO_EXCESS_BASE64'] = {
- re = string.format('%s & !%s', to_encoded_b64, to_needs_mime),
- score = 1.5,
- description = 'To header is unnecessarily encoded in base64',
- group = 'excessb64'
- }
-
- -- To that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
- -- Final rule
- reconf['TO_EXCESS_QP'] = {
- re = string.format('%s & !%s', to_encoded_qp, to_needs_mime),
- score = 1.2,
- description = 'To header is unnecessarily encoded in quoted-printable',
- group = 'excessqp'
- }
-
- -- Reply-To that contains encoded characters while base 64 is not needed as all symbols are 7bit
- -- Regexp that checks that Reply-To header is encoded with base64 (search in raw headers)
- local replyto_encoded_b64 = 'Reply-To=/\\=\\?\\S+\\?B\\?/iX'
- -- Reply-To contains only 7bit characters (parsed headers are used)
- local replyto_needs_mime = 'Reply-To=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
- -- Final rule
- reconf['REPLYTO_EXCESS_BASE64'] = {
- re = string.format('%s & !%s', replyto_encoded_b64, replyto_needs_mime),
- score = 1.5,
- description = 'Reply-To header is unnecessarily encoded in base64',
- group = 'excessb64'
- }
-
- -- Reply-To that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
- -- Regexp that checks that Reply-To header is encoded with quoted-printable (search in raw headers)
- local replyto_encoded_qp = 'Reply-To=/\\=\\?\\S+\\?Q\\?/iX'
- -- Final rule
- reconf['REPLYTO_EXCESS_QP'] = {
- re = string.format('%s & !%s', replyto_encoded_qp, replyto_needs_mime),
- score = 1.2,
- description = 'Reply-To header is unnecessarily encoded in quoted-printable',
- group = 'excessqp'
- }
-
- -- Cc that contains encoded characters while base 64 is not needed as all symbols are 7bit
- -- Regexp that checks that Cc header is encoded with base64 (search in raw headers)
- local cc_encoded_b64 = 'Cc=/\\=\\?\\S+\\?B\\?/iX'
- -- Co contains only 7bit characters (parsed headers are used)
- local cc_needs_mime = 'Cc=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
- -- Final rule
- reconf['CC_EXCESS_BASE64'] = {
- re = string.format('%s & !%s', cc_encoded_b64, cc_needs_mime),
- score = 1.5,
- description = 'Cc header is unnecessarily encoded in base64',
- group = 'excessb64'
- }
-
- -- Cc that contains encoded characters while quoted-printable is not needed as all symbols are 7bit
- -- Regexp that checks that Cc header is encoded with quoted-printable (search in raw headers)
- local cc_encoded_qp = 'Cc=/\\=\\?\\S+\\?Q\\?/iX'
- -- Final rule
- reconf['CC_EXCESS_QP'] = {
- re = string.format('%s & !%s', cc_encoded_qp, cc_needs_mime),
- score = 1.2,
- description = 'Cc header is unnecessarily encoded in quoted-printable',
- group = 'excessqp'
- }
-
- local subj_encoded_b64 = 'Subject=/\\=\\?\\S+\\?B\\?/iX'
- local subj_needs_mime = 'Subject=/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f-\\xff]/Hr'
- reconf['SUBJ_EXCESS_BASE64'] = {
- re = string.format('%s & !%s', subj_encoded_b64, subj_needs_mime),
- score = 1.5,
- description = 'Subject header is unnecessarily encoded in base64',
- group = 'excessb64'
- }
-
- local subj_encoded_qp = 'Subject=/\\=\\?\\S+\\?Q\\?/iX'
- reconf['SUBJ_EXCESS_QP'] = {
- re = string.format('%s & !%s', subj_encoded_qp, subj_needs_mime),
- score = 1.2,
- description = 'Subject header is unnecessarily encoded in quoted-printable',
- group = 'excessqp'
- }
-
- -- Detect forged outlook headers
- -- OE X-Mailer header
- local oe_mua = 'X-Mailer=/\\bOutlook Express [456]\\./H'
- -- OE Message ID format
- local oe_msgid_1 = 'Message-Id=/^<?[A-Za-z0-9-]{7}[A-Za-z0-9]{20}\\@hotmail\\.com>?$/mH'
- local oe_msgid_2 = 'Message-Id=/^<?(?:[0-9a-f]{8}|[0-9a-f]{12})\\$[0-9a-f]{8}\\$[0-9a-f]{8}\\@\\S+>?$/H'
- -- EZLM remail of message
- local lyris_ezml_remailer = 'List-Unsubscribe=/<mailto:(?:leave-\\S+|\\S+-unsubscribe)\\@\\S+>$/H'
- -- Header of wacky sendmail
- local wacky_sendmail_version = 'Received=/\\/CWT\\/DCE\\)/H'
- -- Iplanet received header
- local iplanet_messaging_server = 'Received=/iPlanet Messaging Server/H'
- -- Hotmail message id
- local hotmail_baydav_msgid = 'Message-Id=/^<?BAY\\d+-DAV\\d+[A-Z0-9]{25}\\@phx\\.gbl?>$/H'
- -- Sympatico message id
- local sympatico_msgid = 'Message-Id=/^<?BAYC\\d+-PASMTP\\d+[A-Z0-9]{25}\\@CEZ\\.ICE>?$/H'
- -- Mailman message id
- -- https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/Mailman/Utils.py#L811
- local mailman_msgid = [[Message-ID=/^<mailman\.\d+\.\d+\.\d+\.[-+.:=\w]+@[-a-zA-Z\d.]+>$/H]]
- -- Message id seems to be forged
- local unusable_msgid = string.format('(%s | %s | %s | %s | %s | %s)',
- lyris_ezml_remailer, wacky_sendmail_version,
- iplanet_messaging_server, hotmail_baydav_msgid, sympatico_msgid, mailman_msgid)
- -- Outlook express data seems to be forged
- local forged_oe = string.format('(%s & !%s & !%s & !%s)', oe_mua, oe_msgid_1, oe_msgid_2, unusable_msgid)
- -- Outlook specific headers
- local outlook_dollars_mua = 'X-Mailer=/^Microsoft Outlook(?: 8| CWS, Build 9|, Build 10)\\./H'
- local outlook_dollars_other = 'Message-Id=/^<?\\!\\~\\!>?/H'
- local vista_msgid = 'Message-Id=/^<?[A-F\\d]{32}\\@\\S+>?$/H'
- local ims_msgid = 'Message-Id=/^<?[A-F\\d]{36,40}\\@\\S+>?$/H'
- -- Forged outlook headers
- local forged_outlook_dollars = string.format('(%s & !%s & !%s & !%s & !%s & !%s)',
- outlook_dollars_mua, oe_msgid_2, outlook_dollars_other, vista_msgid, ims_msgid, unusable_msgid)
- -- Outlook versions that should be excluded from summary rule
- local fmo_excl_o3416 = 'X-Mailer=/^Microsoft Outlook, Build 10.0.3416$/H'
- local fmo_excl_oe3790 = 'X-Mailer=/^Microsoft Outlook Express 6.00.3790.3959$/H'
- -- Summary rule for forged outlook
- reconf['FORGED_MUA_OUTLOOK'] = {
- re = string.format('(%s | %s) & !%s & !%s & !%s',
- forged_oe, forged_outlook_dollars, fmo_excl_o3416, fmo_excl_oe3790, vista_msgid),
- score = 3.0,
- description = 'Forged Outlook MUA',
- group = 'mua'
- }
-
- -- HTML outlook signs
- local mime_html = 'content_type_is_type(text) & content_type_is_subtype(/.?html/)'
- local tag_exists_html = 'has_html_tag(html)'
- local tag_exists_head = 'has_html_tag(head)'
- local tag_exists_meta = 'has_html_tag(meta)'
- local tag_exists_body = 'has_html_tag(body)'
- reconf['FORGED_OUTLOOK_TAGS'] = {
- re = string.format('!%s & %s & %s & !(%s & %s & %s & %s)',
- yahoo_bulk, any_outlook_mua, mime_html, tag_exists_html, tag_exists_head,
- tag_exists_meta, tag_exists_body),
- score = 2.1,
- description = "Message pretends to be send from Outlook but has 'strange' tags",
- group = 'headers'
- }
-
- -- Forged OE/MSO boundary
- reconf['SUSPICIOUS_BOUNDARY'] = {
- re = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_(00EBFFA4|0102FFA4|32C6FFA4|3302FFA4)\\.[A-Z\\d]{8}"[\\r\\n]*$/siX',
- score = 5.0,
- description = 'Suspicious boundary in Content-Type header',
- group = 'mua'
- }
- -- Forged OE/MSO boundary
- reconf['SUSPICIOUS_BOUNDARY2'] = {
- re = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_(01C6527E)\\.[A-Z\\d]{8}"[\\r\\n]*$/siX',
- score = 4.0,
- description = 'Suspicious boundary in Content-Type header',
- group = 'mua'
- }
- -- Forged OE/MSO boundary
- reconf['SUSPICIOUS_BOUNDARY3'] = {
- re = 'Content-Type=/^\\s*multipart.+boundary="-----000-00\\d\\d-01C[\\dA-F]{5}-[\\dA-F]{8}"[\\r\\n]*$/siX',
- score = 3.0,
- description = 'Suspicious boundary in Content-Type header',
- group = 'mua'
- }
- -- Forged OE/MSO boundary
- local suspicious_boundary_01C4 = 'Content-Type=/^\\s*multipart.+boundary="----=_NextPart_000_[A-Z\\d]{4}_01C4[\\dA-F]{4}\\.[A-Z\\d]{8}"[\\r\\n]*$/siX'
- local suspicious_boundary_01C4_date = 'Date=/^\\s*\\w\\w\\w,\\s+\\d+\\s+\\w\\w\\w 20(0[56789]|1\\d)/'
- reconf['SUSPICIOUS_BOUNDARY4'] = {
- re = string.format('(%s) & (%s)', suspicious_boundary_01C4, suspicious_boundary_01C4_date),
- score = 4.0,
- description = 'Suspicious boundary in Content-Type header',
- group = 'mua'
- }
-
- -- Detect forged The Bat! headers
- -- The Bat! X-Mailer header
- local thebat_mua_any = 'X-Mailer=/^\\s*The Bat!/H'
- -- The Bat! common Message-ID template
- local thebat_msgid_common = 'Message-ID=/^<?\\d+\\.\\d+\\@\\S+>?$/mH'
- -- Correct The Bat! Message-ID template
- local thebat_msgid = 'Message-ID=/^<?\\d+\\.(19[789]\\d|20\\d\\d)(0\\d|1[012])([012]\\d|3[01])([0-5]\\d)([0-5]\\d)([0-5]\\d)\\@\\S+>?/mH'
- -- Summary rule for forged The Bat! Message-ID header
- reconf['FORGED_MUA_THEBAT_MSGID'] = {
- re = string.format('(%s) & !(%s) & (%s) & !(%s)', thebat_mua_any, thebat_msgid, thebat_msgid_common, unusable_msgid),
- score = 4.0,
- description = 'Message pretends to be send from The Bat! but has forged Message-ID',
- group = 'mua'
- }
- -- Summary rule for forged The Bat! Message-ID header with unknown template
- reconf['FORGED_MUA_THEBAT_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !(%s) & !(%s) & !(%s)', thebat_mua_any, thebat_msgid, thebat_msgid_common, unusable_msgid),
- score = 3.0,
- description = 'Message pretends to be send from The Bat! but has forged Message-ID',
- group = 'mua'
- }
-
- -- Detect forged KMail headers
- -- KMail User-Agent header
- local kmail_mua = 'User-Agent=/^\\s*KMail\\/1\\.\\d+\\.\\d+/H'
- -- KMail common Message-ID template
- local kmail_msgid_common = 'Message-Id=/^<?\\s*\\d+\\.\\d+\\.\\S+\\@\\S+>?$/mH'
- -- Summary rule for forged KMail Message-ID header with unknown template
- reconf['FORGED_MUA_KMAIL_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !(%s) & !(%s)', kmail_mua, kmail_msgid_common, unusable_msgid),
- score = 2.5,
- description = 'Message pretends to be send from KMail but has forged Message-ID',
- group = 'mua'
- }
-
- -- Detect forged Opera Mail headers
- -- Opera Mail User-Agent header
- local opera1x_mua = 'User-Agent=/^\\s*Opera Mail\\/1[01]\\.\\d+ /H'
- -- Opera Mail Message-ID template
- local opera1x_msgid = 'Message-ID=/^<?op\\.[a-z\\d]{14}\\@\\S+>?$/H'
- -- Rule for forged Opera Mail Message-ID header
- reconf['FORGED_MUA_OPERA_MSGID'] = {
- re = string.format('(%s) & !(%s) & !(%s)', opera1x_mua, opera1x_msgid, unusable_msgid),
- score = 4.0,
- description = 'Message pretends to be send from Opera Mail but has forged Message-ID',
- group = 'mua'
- }
-
- -- Detect forged Mozilla Mail/Thunderbird/Seamonkey/Postbox headers
- -- Mozilla based X-Mailer
- local user_agent_mozilla5 = 'User-Agent=/^\\s*Mozilla\\/5\\.0/H'
- local user_agent_thunderbird = 'User-Agent=/^\\s*(Thunderbird|Mozilla Thunderbird|Mozilla\\/.*Gecko\\/.*(Thunderbird|Betterbird|Icedove)\\/)/H'
- local user_agent_seamonkey = 'User-Agent=/^\\s*Mozilla\\/5\\.0\\s.+\\sSeaMonkey\\/\\d+\\.\\d+/H'
- local user_agent_postbox = [[User-Agent=/^\s*Mozilla\/5\.0\s\([^)]+\)\sGecko\/\d+\sPostboxApp\/\d+(?:\.\d+){2,3}$/H]]
- local user_agent_mozilla = string.format('(%s) & !(%s) & !(%s) & !(%s)', user_agent_mozilla5, user_agent_thunderbird,
- user_agent_seamonkey, user_agent_postbox)
- -- Mozilla based common Message-ID template
- local mozilla_msgid_common = 'Message-ID=/^\\s*<[\\dA-F]{8}\\.\\d{1,7}\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
- local mozilla_msgid_common_sec = 'Message-ID=/^\\s*<[\\da-f]{8}-([\\da-f]{4}-){3}[\\da-f]{12}\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
- local mozilla_msgid = 'Message-ID=/^\\s*<(3[3-9A-F]|[4-9A-F][\\dA-F])[\\dA-F]{6}\\.(\\d0){1,4}\\d\\@([^>\\.]+\\.)+[^>\\.]+>$/H'
- -- Summary rule for forged Mozilla Mail Message-ID header
- reconf['FORGED_MUA_MOZILLA_MAIL_MSGID'] = {
- re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_mozilla, mozilla_msgid_common, mozilla_msgid,
- unusable_msgid),
- score = 4.0,
- description = 'Message pretends to be send from Mozilla Mail but has forged Message-ID',
- group = 'mua'
- }
- reconf['FORGED_MUA_MOZILLA_MAIL_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !(%s) & !(%s) & !(%s)', user_agent_mozilla, mozilla_msgid_common, mozilla_msgid,
- unusable_msgid),
- score = 2.5,
- description = 'Message pretends to be send from Mozilla Mail but has forged Message-ID',
- group = 'mua'
- }
-
- -- Summary rule for forged Thunderbird Message-ID header
- reconf['FORGED_MUA_THUNDERBIRD_MSGID'] = {
- re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_thunderbird, mozilla_msgid_common, mozilla_msgid,
- unusable_msgid),
- score = 4.0,
- description = 'Forged mail pretending to be from Mozilla Thunderbird but has forged Message-ID',
- group = 'mua'
- }
- reconf['FORGED_MUA_THUNDERBIRD_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_thunderbird, mozilla_msgid_common,
- mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
- score = 2.5,
- description = 'Forged mail pretending to be from Mozilla Thunderbird but has forged Message-ID',
- group = 'mua'
- }
- -- Summary rule for forged Seamonkey Message-ID header
- reconf['FORGED_MUA_SEAMONKEY_MSGID'] = {
- re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_seamonkey, mozilla_msgid_common, mozilla_msgid,
- unusable_msgid),
- score = 4.0,
- description = 'Forged mail pretending to be from Mozilla Seamonkey but has forged Message-ID',
- group = 'mua'
- }
- reconf['FORGED_MUA_SEAMONKEY_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_seamonkey, mozilla_msgid_common,
- mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
- score = 2.5,
- description = 'Forged mail pretending to be from Mozilla Seamonkey but has forged Message-ID',
- group = 'mua'
- }
- -- Summary rule for forged Postbox Message-ID header
- reconf['FORGED_MUA_POSTBOX_MSGID'] = {
- re = string.format('(%s) & (%s) & !(%s) & !(%s)', user_agent_postbox, mozilla_msgid_common, mozilla_msgid,
- unusable_msgid),
- score = 4.0,
- description = 'Forged mail pretending to be from Postbox but has forged Message-ID',
- group = 'mua'
- }
- reconf['FORGED_MUA_POSTBOX_MSGID_UNKNOWN'] = {
- re = string.format('(%s) & !((%s) | (%s)) & !(%s) & !(%s)', user_agent_postbox, mozilla_msgid_common,
- mozilla_msgid_common_sec, mozilla_msgid, unusable_msgid),
- score = 2.5,
- description = 'Forged mail pretending to be from Postbox but has forged Message-ID',
- group = 'mua'
- }
-
- -- Message id validity
- local sane_msgid = 'Message-Id=/^<?[^<>\\\\ \\t\\n\\r\\x0b\\x80-\\xff]+\\@[^<>\\\\ \\t\\n\\r\\x0b\\x80-\\xff]+>?\\s*$/H'
- local msgid_comment = 'Message-Id=/\\(.*\\)/H'
- reconf['INVALID_MSGID'] = {
- re = string.format('(%s) & !((%s) | (%s))', has_mid, sane_msgid, msgid_comment),
- score = 1.7,
- description = 'Message-ID header is incorrect',
- group = 'headers'
- }
-
- -- Only Content-Type header without other MIME headers
- local cd = 'header_exists(Content-Disposition)'
- local cte = 'header_exists(Content-Transfer-Encoding)'
- local ct = 'header_exists(Content-Type)'
- local mime_version = 'raw_header_exists(MIME-Version)'
- local ct_text_plain = 'content_type_is_type(text) & content_type_is_subtype(plain)'
- reconf['MIME_HEADER_CTYPE_ONLY'] = {
- re = string.format('!(%s) & !(%s) & (%s) & !(%s) & !(%s)', cd, cte, ct, mime_version, ct_text_plain),
- score = 2.0,
- description = 'Only Content-Type header without other MIME headers',
- group = 'headers'
- }
-
- -- Forged Exchange messages
- local msgid_dollars_ok = 'Message-Id=/[0-9a-f]{4,}\\$[0-9a-f]{4,}\\$[0-9a-f]{4,}\\@\\S+/H'
- local mimeole_ms = 'X-MimeOLE=/^Produced By Microsoft MimeOLE/H'
- local rcvd_with_exchange = 'Received=/with Microsoft Exchange Server/H'
- reconf['RATWARE_MS_HASH'] = {
- re = string.format('(%s) & !(%s) & !(%s)', msgid_dollars_ok, mimeole_ms, rcvd_with_exchange),
- score = 2.0,
- description = 'Forged Exchange messages',
- group = 'headers'
- }
-
- -- Reply-type in content-type
- reconf['STOX_REPLY_TYPE'] = {
- re = 'Content-Type=/text\\/plain; .* reply-type=original/H',
- score = 1.0,
- description = 'Reply-type in Content-Type header',
- group = 'headers'
- }
-
- -- Forged yahoo msgid
- local at_yahoo_msgid = 'Message-Id=/\\@yahoo\\.com\\b/iH'
- local from_yahoo_com = 'From=/\\@yahoo\\.com\\b/iH'
- reconf['FORGED_MSGID_YAHOO'] = {
- re = string.format('(%s) & !(%s)', at_yahoo_msgid, from_yahoo_com),
- score = 2.0,
- description = 'Forged Yahoo Message-ID header',
- group = 'headers'
- }
-
- -- Forged The Bat! MUA headers
- local thebat_mua_v1 = 'X-Mailer=/^The Bat! \\(v1\\./H'
- local ctype_has_boundary = 'Content-Type=/boundary/iH'
- local bat_boundary = 'Content-Type=/boundary=\\"?-{10}/H'
- local mailman_21 = 'X-Mailman-Version=/\\d/H'
- reconf['FORGED_MUA_THEBAT_BOUN'] = {
- re = string.format('(%s) & (%s) & !(%s) & !(%s)', thebat_mua_v1, ctype_has_boundary, bat_boundary, mailman_21),
- score = 2.0,
- description = 'Forged The Bat! MUA headers',
- group = 'headers'
- }
-
- -- Detect Mail.Ru web-mail
- local xm_mail_ru_mailer_1_0 = 'X-Mailer=/^Mail\\.Ru Mailer 1\\.0$/H'
- local rcvd_e_mail_ru = 'Received=/^(?:from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] )?by e\\.mail\\.ru with HTTP;/mH'
- reconf['MAIL_RU_MAILER'] = {
- re = string.format('(%s) & (%s)', xm_mail_ru_mailer_1_0, rcvd_e_mail_ru),
- score = 0.0,
- description = 'Sent with Mail.Ru webmail',
- group = 'headers'
- }
-
- -- Detect yandex.ru web-mail
- local xm_yandex_ru_mailer_5_0 = 'X-Mailer=/^Yamail \\[ http:\\/\\/yandex\\.ru \\] 5\\.0$/H'
- local rcvd_web_yandex_ru = 'Received=/^by web\\d{1,2}[a-z]\\.yandex\\.ru with HTTP;/mH'
- reconf['YANDEX_RU_MAILER'] = {
- re = string.format('(%s) & (%s)', xm_yandex_ru_mailer_5_0, rcvd_web_yandex_ru),
- score = 0.0,
- description = 'Sent with Yandex webmail',
- group = 'headers'
- }
-
- -- Detect 1C v8.2 and v8.3 mailers
- reconf['MAILER_1C_8'] = {
- re = 'X-Mailer=/^1C:Enterprise 8\\.[23]$/H',
- score = 0.0,
- description = 'Sent with 1C:Enterprise 8',
- group = 'headers'
- }
-
- -- Detect rogue 'strongmail' MTA with IPv4 and '(-)' in Received line
- reconf['STRONGMAIL'] = {
- re = [[Received=/^from\s+strongmail\s+\(\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]\) by \S+ \(-\); /mH]],
- score = 6.0,
- description = 'Sent via rogue "strongmail" MTA',
- group = 'headers'
- }
-
- -- Two received headers with ip addresses
- local double_ip_spam_1 = 'Received=/from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by \\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3} with/H'
- local double_ip_spam_2 = 'Received=/from\\s+\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\s+by\\s+\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3};/H'
- reconf['RCVD_DOUBLE_IP_SPAM'] = {
- re = string.format('(%s) | (%s)', double_ip_spam_1, double_ip_spam_2),
- score = 2.0,
- description = 'Has two Received headers containing bare IP addresses',
- group = 'headers'
- }
-
- -- Quoted reply-to from yahoo (seems to be forged)
- local repto_quote = 'Reply-To=/\\".*\\"\\s*\\</H'
- reconf['REPTO_QUOTE_YAHOO'] = {
- re = string.format('(%s) & ((%s) | (%s))', repto_quote, from_yahoo_com, at_yahoo_msgid),
- score = 2.0,
- description = 'Quoted Reply-To header from Yahoo (seems to be forged)',
- group = 'headers'
- }
-
- reconf['FAKE_REPLY'] = {
- re = [[Subject=/^re:/i{header} & !(header_exists(In-Reply-To) | header_exists(References))]],
- description = 'Fake reply',
- score = 1.0,
- group = 'headers'
- }
-
- -- Mime-OLE is needed but absent (e.g. fake Outlook or fake Exchange)
- local has_msmail_pri = 'header_exists(X-MSMail-Priority)'
- local has_mimeole = 'header_exists(X-MimeOLE)'
- local has_squirrelmail_in_mailer = 'X-Mailer=/SquirrelMail\\b/H'
- local has_office_version_in_mailer = [[X-Mailer=/^Microsoft (?:Office )?Outlook [12]\d\.0/]]
- local has_x_android_message_id = 'header_exists(X-Android-Message-Id)'
- reconf['MISSING_MIMEOLE'] = {
- re = string.format('(%s) & !(%s) & !(%s) & !(%s) & !(%s)',
- has_msmail_pri,
- has_mimeole,
- has_squirrelmail_in_mailer,
- has_office_version_in_mailer,
- has_x_android_message_id),
- score = 2.0,
- description = 'Mime-OLE is needed but absent (e.g. fake Outlook or fake Exchange)',
- group = 'headers'
- }
-
- -- Empty delimiters between header names and header values
- local function gen_check_header_delimiter_empty(header_name)
- return function(task)
- for _, rh in ipairs(task:get_header_full(header_name) or {}) do
- if rh['empty_separator'] then
- return true
- end
- end
- return false
- end
- end
- reconf['HEADER_FROM_EMPTY_DELIMITER'] = {
- re = string.format('(%s)', 'lua:check_from_delim_empty'),
- score = 1.0,
- description = 'From header has no delimiter between header name and header value',
- group = 'headers',
- functions = {
- check_from_delim_empty = gen_check_header_delimiter_empty('From')
- }
- }
- reconf['HEADER_TO_EMPTY_DELIMITER'] = {
- re = string.format('(%s)', 'lua:check_to_delim_empty'),
- score = 1.0,
- description = 'To header has no delimiter between header name and header value',
- group = 'headers',
- functions = {
- check_to_delim_empty = gen_check_header_delimiter_empty('To')
- }
- }
- reconf['HEADER_CC_EMPTY_DELIMITER'] = {
- re = string.format('(%s)', 'lua:check_cc_delim_empty'),
- score = 1.0,
- description = 'Cc header has no delimiter between header name and header value',
- group = 'headers',
- functions = {
- check_cc_delim_empty = gen_check_header_delimiter_empty('Cc')
- }
- }
- reconf['HEADER_REPLYTO_EMPTY_DELIMITER'] = {
- re = string.format('(%s)', 'lua:check_repto_delim_empty'),
- score = 1.0,
- description = 'Reply-To header has no delimiter between header name and header value',
- group = 'headers',
- functions = {
- check_repto_delim_empty = gen_check_header_delimiter_empty('Reply-To')
- }
- }
- reconf['HEADER_DATE_EMPTY_DELIMITER'] = {
- re = string.format('(%s)', 'lua:check_date_delim_empty'),
- score = 1.0,
- description = 'Date header has no delimiter between header name and header value',
- group = 'headers',
- functions = {
- check_date_delim_empty = gen_check_header_delimiter_empty('Date')
- }
- }
-
- -- Definitions of received headers regexp
- reconf['RCVD_ILLEGAL_CHARS'] = {
- re = 'Received=/[\\x80-\\xff]/X',
- score = 4.0,
- description = 'Received header has raw illegal character',
- group = 'headers'
- }
-
- local MAIL_RU_Return_Path = 'Return-path=/^\\s*<.+\\@mail\\.ru>$/iX'
- local MAIL_RU_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@mail\\.ru>$/iX'
- local MAIL_RU_From = 'From=/\\@mail\\.ru>?$/iX'
- local MAIL_RU_Received = 'Received=/from mail\\.ru \\(/mH'
-
- reconf['FAKE_RECEIVED_mail_ru'] = {
- re = string.format('(%s) & !(((%s) | (%s)) & (%s))',
- MAIL_RU_Received, MAIL_RU_Return_Path, MAIL_RU_X_Envelope_From, MAIL_RU_From),
- score = 4.0,
- description = 'Fake HELO mail.ru in Received header from non-mail.ru sender address',
- group = 'headers'
- }
-
- local GMAIL_COM_Return_Path = 'Return-path=/^\\s*<.+\\@gmail\\.com>$/iX'
- local GMAIL_COM_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@gmail\\.com>$/iX'
- local GMAIL_COM_From = 'From=/\\@gmail\\.com>?$/iX'
-
- local UKR_NET_Return_Path = 'Return-path=/^\\s*<.+\\@ukr\\.net>$/iX'
- local UKR_NET_X_Envelope_From = 'X-Envelope-From=/^\\s*<.+\\@ukr\\.net>$/iX'
- local UKR_NET_From = 'From=/\\@ukr\\.net>?$/iX'
-
- local RECEIVED_smtp_yandex_ru_1 = 'Received=/from \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] \\((port=\\d+ )?helo=smtp\\.yandex\\.ru\\)/iX'
- local RECEIVED_smtp_yandex_ru_2 = 'Received=/from \\[UNAVAILABLE\\] \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]:\\d+ helo=smtp\\.yandex\\.ru\\)/iX'
- local RECEIVED_smtp_yandex_ru_3 = 'Received=/from \\S+ \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]:\\d+ helo=smtp\\.yandex\\.ru\\)/iX'
- local RECEIVED_smtp_yandex_ru_4 = 'Received=/from \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] \\(account \\S+ HELO smtp\\.yandex\\.ru\\)/iX'
- local RECEIVED_smtp_yandex_ru_5 = 'Received=/from smtp\\.yandex\\.ru \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]\\)/iX'
- local RECEIVED_smtp_yandex_ru_6 = 'Received=/from smtp\\.yandex\\.ru \\(\\S+ \\[\\d+\\.\\d+\\.\\d+\\.\\d+\\]\\)/iX'
- local RECEIVED_smtp_yandex_ru_7 = 'Received=/from \\S+ \\(HELO smtp\\.yandex\\.ru\\) \\(\\S+\\@\\d+\\.\\d+\\.\\d+\\.\\d+\\)/iX'
- local RECEIVED_smtp_yandex_ru_8 = 'Received=/from \\S+ \\(HELO smtp\\.yandex\\.ru\\) \\(\\d+\\.\\d+\\.\\d+\\.\\d+\\)/iX'
- local RECEIVED_smtp_yandex_ru_9 = 'Received=/from \\S+ \\(\\[\\d+\\.\\d+\\.\\d+\\.\\d+\\] helo=smtp\\.yandex\\.ru\\)/iX'
-
- reconf['FAKE_RECEIVED_smtp_yandex_ru'] = {
- re = string.format('(((%s) & ((%s) | (%s))) | ((%s) & ((%s) | (%s))) ' ..
- ' | ((%s) & ((%s) | (%s)))) & (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s) | (%s)',
- MAIL_RU_From, MAIL_RU_Return_Path, MAIL_RU_X_Envelope_From, GMAIL_COM_From,
- GMAIL_COM_Return_Path, GMAIL_COM_X_Envelope_From, UKR_NET_From, UKR_NET_Return_Path,
- UKR_NET_X_Envelope_From, RECEIVED_smtp_yandex_ru_1, RECEIVED_smtp_yandex_ru_2,
- RECEIVED_smtp_yandex_ru_3, RECEIVED_smtp_yandex_ru_4, RECEIVED_smtp_yandex_ru_5,
- RECEIVED_smtp_yandex_ru_6, RECEIVED_smtp_yandex_ru_7, RECEIVED_smtp_yandex_ru_8,
- RECEIVED_smtp_yandex_ru_9),
- score = 4.0,
- description = 'Fake smtp.yandex.ru Received header',
- group = 'headers'
- }
-
- reconf['FORGED_GENERIC_RECEIVED'] = {
- re = 'Received=/^\\s*(.+\\n)*from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by (([\\w\\d-]+\\.)+[a-zA-Z]{2,6}|\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}); \\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0/X',
- score = 3.6,
- description = 'Forged generic Received header',
- group = 'headers'
- }
-
- reconf['FORGED_GENERIC_RECEIVED2'] = {
- re = 'Received=/^\\s*(.+\\n)*from \\[\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\] by ([\\w\\d-]+\\.)+[a-z]{2,6} id [\\w\\d]{12}; \\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0/X',
- score = 3.6,
- description = 'Forged generic Received header',
- group = 'headers'
- }
-
- reconf['FORGED_GENERIC_RECEIVED3'] = {
- re = 'Received=/^\\s*(.+\\n)*by \\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3} with SMTP id [a-zA-Z]{14}\\.\\d{13};[\\r\\n\\s]*\\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0 \\(GMT\\)/X',
- score = 3.6,
- description = 'Forged generic Received header',
- group = 'headers'
- }
-
- reconf['FORGED_GENERIC_RECEIVED4'] = {
- re = 'Received=/^\\s*(.+\\n)*from localhost by \\S+;\\s+\\w{3}, \\d+ \\w{3} 20\\d\\d \\d\\d\\:\\d\\d\\:\\d\\d [+-]\\d\\d\\d0[\\s\\r\\n]*$/X',
- score = 3.6,
- description = 'Forged generic Received header',
- group = 'headers'
- }
-
- reconf['INVALID_POSTFIX_RECEIVED'] = {
- re = 'Received=/ \\(Postfix\\) with ESMTP id [A-Z\\d]+([\\s\\r\\n]+for <\\S+?>)?;[\\s\\r\\n]*[A-Z][a-z]{2}, \\d{1,2} [A-Z][a-z]{2} \\d\\d\\d\\d \\d\\d:\\d\\d:\\d\\d [\\+\\-]\\d\\d\\d\\d$/X',
- score = 3.0,
- description = 'Invalid Postfix Received header',
- group = 'headers'
- }
-
- reconf['RECEIVED_HELO_LOCALHOST'] = {
- re = 'Received=/from (localhost|\\[127\\.0\\.0\\.1\\])\\s+/X',
- score = 0.0,
- description = 'Localhost HELO seen in Received header',
- group = 'headers'
- }
-
- reconf['X_PHP_FORGED_0X'] = {
- re = "X-PHP-Originating-Script=/^0\\d/X",
- score = 4.0,
- description = "X-PHP-Originating-Script header appears forged",
- group = 'headers'
- }
-
- reconf['GOOGLE_FORWARDING_MID_MISSING'] = {
- re = "Message-ID=/SMTPIN_ADDED_MISSING\\@mx\\.google\\.com>$/X",
- score = 2.5,
- description = "Message was missing Message-ID pre-forwarding",
- group = 'headers'
- }
-
- reconf['GOOGLE_FORWARDING_MID_BROKEN'] = {
- re = "Message-ID=/SMTPIN_ADDED_BROKEN\\@mx\\.google\\.com>$/X",
- score = 1.7,
- description = "Message had invalid Message-ID pre-forwarding",
- group = 'headers'
- }
-
- reconf['CTE_CASE'] = {
- re = 'Content-Transfer-Encoding=/^[78]B/X',
- description = '[78]Bit .vs. [78]bit',
- score = 0.5,
- group = 'headers'
- }
-
- reconf['HAS_INTERSPIRE_SIG'] = {
- re = string.format('((%s) & (%s) & (%s) & (%s)) | (%s)',
- 'header_exists(X-Mailer-LID)',
- 'header_exists(X-Mailer-RecptId)',
- 'header_exists(X-Mailer-SID)',
- 'header_exists(X-Mailer-Sent-By)',
- 'List-Unsubscribe=/\\/unsubscribe\\.php\\?M=[^&]+&C=[^&]+&L=[^&]+&N=[^>]+>$/Xi'),
- description = "Has Interspire fingerprint",
- score = 1.0,
- group = 'headers'
- }
-
- reconf['CT_EXTRA_SEMI'] = {
- re = 'Content-Type=/;$/X',
- description = 'Content-Type header ends with a semi-colon',
- score = 1.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_ENDS_EXCLAIM'] = {
- re = 'Subject=/!\\s*$/H',
- description = 'Subject ends with an exclamation mark',
- score = 0.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_HAS_EXCLAIM'] = {
- re = string.format('%s & !%s', 'Subject=/!/H', 'Subject=/!\\s*$/H'),
- description = 'Subject contains an exclamation mark',
- score = 0.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_ENDS_QUESTION'] = {
- re = 'Subject=/\\?\\s*$/Hu',
- description = 'Subject ends with a question mark',
- score = 1.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_HAS_QUESTION'] = {
- re = string.format('%s & !%s', 'Subject=/\\?/H', 'Subject=/\\?\\s*$/Hu'),
- description = 'Subject contains a question mark',
- score = 0.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_HAS_CURRENCY'] = {
- re = 'Subject=/\\p{Sc}/Hu',
- description = 'Subject contains currency',
- score = 1.0,
- group = 'headers'
- }
-
- reconf['SUBJECT_ENDS_SPACES'] = {
- re = 'Subject=/\\s+$/H',
- description = 'Subject ends with space characters',
- score = 0.5,
- group = 'headers'
- }
-
- reconf['HAS_ORG_HEADER'] = {
- re = string.format('%s || %s', 'header_exists(Organization)', 'header_exists(Organisation)'),
- description = 'Has Organization header',
- score = 0.0,
- group = 'headers'
- }
-
- reconf['X_PHPOS_FAKE'] = {
- re = 'X-PHP-Originating-Script=/^\\d{7}:/Hi',
- description = 'Fake X-PHP-Originating-Script header',
- score = 3.0,
- group = 'headers'
- }
-
- reconf['HAS_XOIP'] = {
- re = "header_exists('X-Originating-IP')",
- description = "Has X-Originating-IP header",
- score = 0.0,
- group = 'headers'
- }
-
- reconf['HAS_LIST_UNSUB'] = {
- re = string.format('%s', 'header_exists(List-Unsubscribe)'),
- description = 'Has List-Unsubscribe header',
- score = -0.01,
- group = 'headers'
- }
-
- reconf['HAS_GUC_PROXY_URI'] = {
- re = '/\\.googleusercontent\\.com\\/proxy/{url}i',
- description = 'Has googleusercontent.com proxy URL',
- score = 1.0,
- group = 'url'
- }
-
- reconf['HAS_GOOGLE_REDIR'] = {
- re = '/\\.google\\.([a-z]{2,3}(|\\.[a-z]{2,3})|info|jobs)\\/(amp\\/s\\/|url\\?)/{url}i',
- description = 'Has google.com/url or alike Google redirection URL',
- score = 1.0,
- group = 'url'
- }
-
- reconf['HAS_GOOGLE_FIREBASE_URL'] = {
- re = '/\\.firebasestorage\\.googleapis\\.com\\//{url}i',
- description = 'Contains firebasestorage.googleapis.com URL',
- score = 2.0,
- group = 'url'
- }
-
- reconf['HAS_FILE_URL'] = {
- re = '/^file:\\/\\//{url}i',
- description = 'Contains file:// URL',
- score = 2.0,
- group = 'url'
- }
-
- reconf['XM_UA_NO_VERSION'] = {
- re = string.format('(!%s && !%s) && (%s || %s)',
- 'X-Mailer=/https?:/H',
- 'User-Agent=/https?:/H',
- 'X-Mailer=/^[^0-9]+$/H',
- 'User-Agent=/^[^0-9]+$/H'),
- description = 'X-Mailer/User-Agent header has no version number',
- score = 0.01,
- group = 'experimental'
- }
-
- -- Detects messages missing both X-Mailer and User-Agent header
- local has_ua = 'header_exists(User-Agent)'
- local has_xmailer = 'header_exists(X-Mailer)'
- reconf['MISSING_XM_UA'] = {
- re = string.format('!%s && !%s', has_xmailer, has_ua),
- score = 0.0,
- description = 'Message has neither X-Mailer nor User-Agent header',
- group = 'headers',
- }
-
- -- X-Mailer for old MUA versions which are forged by spammers
- local old_x_mailers = {
- -- Outlook Express 6.0 was last included in Windows XP (EOL 2014). Windows
- -- XP is still used (in 2020) by relatively small number of internet users,
- -- but this header is widely abused by spammers.
- 'Microsoft Outlook Express',
- -- Qualcomm Eudora for Windows 7.1.0.9 was released in 2006
- [[QUALCOMM Windows Eudora (Pro )?Version [1-6]\.]],
- -- The Bat 3.0 was released in 2004
- [[The Bat! \(v[12]\.]],
- -- Can be found in public maillist archives, messages circa 2000
- [[Microsoft Outlook IMO, Build 9\.0\.]],
- -- Outlook 2002 (Office XP)
- [[Microsoft Outlook, Build 10\.]],
- -- Some old Apple iOS versions are used on old devices, match only very old
- -- versions (iOS 4.3.5 buid 8L1 was supported until 2013) and less old
- -- versions frequently seen in spam
- [[i(Phone|Pad) Mail \((?:[1-8][A-L]|12H|13E)]],
- }
-
- reconf['OLD_X_MAILER'] = {
- description = 'X-Mailer header has a very old MUA version',
- re = string.format('X-Mailer=/^(?:%s)/{header}', table.concat(old_x_mailers, '|')),
- score = 2.0,
- group = 'headers',
- }
-
- -- Detect Apple Mail
- local apple_x_mailer = [[Apple Mail \((?:(?:Version )?[1-9]\d{0,2}\.\d{1,3}|[1-9]\d{0,2}\.\d{1,4}\.\d{1,4}\.\d{1,4})\)]]
- reconf['APPLE_MAILER'] = {
- description = 'Sent with Apple Mail',
- re = string.format('X-Mailer=/^%s/{header}', apple_x_mailer),
- score = 0.0,
- group = 'headers',
- }
-
- -- Detect Apple iPhone/iPad Mail
- -- Apple iPhone/iPad Mail X-Mailer contains iOS build number, e. g. 9B206, 16H5, 18G5023c
- -- https://en.wikipedia.org/wiki/IOS_version_history
- local apple_ios_x_mailer = [[i(?:Phone|Pad) Mail \(\d{1,2}[A-Z]\d{1,4}[a-z]?\)]]
- reconf['APPLE_IOS_MAILER'] = {
- description = 'Sent with Apple iPhone/iPad Mail',
- re = string.format('X-Mailer=/^%s/{header}', apple_ios_x_mailer),
- score = 0.0,
- group = 'headers',
- }
-
- -- X-Mailer header values which should not occur (in the modern mail) at all
- local bad_x_mailers = {
- -- header name repeated in the header value
- [[X-Mailer: ]],
- -- Mozilla Thunderbird uses User-Agent header, not X-Mailer
- -- Early Thunderbird had U-A like:
- -- Mozilla Thunderbird 1.0.2 (Windows/20050317)
- -- Thunderbird 2.0.0.23 (X11/20090812)
- [[(?:Mozilla )?Thunderbird \d]],
- -- Was used by Yahoo Groups in 2000s, no one expected to use this in 2020s
- [[eGroups Message Poster]],
- -- Regexp for genuine iOS X-Mailer is below, anything which doesn't match it,
- -- but starts with 'iPhone Mail' or 'iPad Mail' is likely fake
- [[i(?:Phone|Pad) Mail]],
- }
-
- reconf['FORGED_X_MAILER'] = {
- description = 'Forged X-Mailer header',
- re = string.format('X-Mailer=/^(?:%s)/{header} && !X-Mailer=/^%s/{header}',
- table.concat(bad_x_mailers, '|'), apple_ios_x_mailer),
- score = 4.5,
- group = 'headers',
- }
-
- -- X-Mailer headers like: 'Internet Mail Service (5.5.2650.21)' are being
- -- forged by spammers, but MS Exchange 5.5 is still being used (in 2020) on
- -- some mail servers. Example of genuine headers (DC-EXMPL is a hostname which
- -- can be a FQDN):
- -- Received: by DC-EXMPL with Internet Mail Service (5.5.2656.59)
- -- id <HKH4BJQX>; Tue, 8 Dec 2020 07:10:54 -0600
- -- Message-ID: <E7209F9DB64FCC4BB1051420F0E955DD05C9D59F@DC-EXMPL>
- -- X-Mailer: Internet Mail Service (5.5.2656.59)
- reconf['FORGED_IMS'] = {
- description = 'Forged X-Mailer: Internet Mail Service',
- re = [[X-Mailer=/^Internet Mail Service \(5\./{header} & !Received=/^by \S+ with Internet Mail Service \(5\./{header}]],
- score = 3.0,
- group = 'headers',
- }
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