| # SpamAssassin rules file: header tests |
| # |
| # Please don't modify this file as your changes will be overwritten with |
| # the next update. Use @@LOCAL_RULES_DIR@@/local.cf instead. |
| # See 'perldoc Mail::SpamAssassin::Conf' for details. |
| # |
| # <@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. |
| # </@LICENSE> |
| # |
| ########################################################################### |
| |
| require_version @@VERSION@@ |
| |
| ########################################################################### |
| |
| # partial messages; currently-theoretical attack |
| # unsurprisingly this hits 0/0 right now. |
| header FRAGMENTED_MESSAGE Content-Type =~ /\bmessage\/partial/i |
| describe FRAGMENTED_MESSAGE Partial message |
| tflags FRAGMENTED_MESSAGE userconf |
| |
| ########################################################################### |
| |
| header FROM_BLANK_NAME From =~ /(?:\s|^)"" <\S+>/i |
| describe FROM_BLANK_NAME From: contains empty name |
| |
| ########################################################################### |
| # numeric address rules, these are written to avoid overlap with each other |
| |
| header __FROM_ENDS_IN_NUMS From:addr =~ /\D\d{8,}\@/i |
| |
| header FROM_STARTS_WITH_NUMS From:addr =~ /^\d{3,50}[^0-9\@]/ |
| describe FROM_STARTS_WITH_NUMS From: starts with several numbers |
| |
| # don't match US/Canada phone numbers: 10 digits optionally preceded by a "1" |
| header __FROM_ALL_NUMS From:addr =~ /^(?:\d{1,9}|[02-9]\d{10}|\d{12,})@/ |
| |
| ########################################################################### |
| |
| header FROM_OFFERS From:addr =~ /\@\S*offers(?![eo]n\b)/i |
| describe FROM_OFFERS From address is "at something-offers" |
| |
| header FROM_NO_USER From =~ /(?:^\@|<\@| \@[^\)<]*$|<>)/ [if-unset: unset@unset.unset] |
| describe FROM_NO_USER From: has no local-part before @ sign |
| |
| # also 100% valid |
| # bug 6149: avoid common .jp false positives |
| header __PLING_QUERY Subject =~ /\?.*!|!.*\?/ |
| meta PLING_QUERY (__PLING_QUERY && !__ISO_2022_JP_DELIM) |
| describe PLING_QUERY Subject has exclamation mark and question mark |
| |
| # A common spam idiosyncrasy |
| describe FROMSPACE Idiosyncratic "From" header format |
| header FROMSPACE From:raw =~ /^\s?\"\s/ |
| |
| |
| |
| header MSGID_SPAM_CAPS Message-ID =~ /^\s*<?[A-Z]+\@(?!(?:mailcity|whowhere)\.com)/ |
| describe MSGID_SPAM_CAPS Spam tool Message-Id: (caps variant) |
| |
| header MSGID_SPAM_LETTERS Message-Id =~ /<[a-z]{5,}\@(?:\S+\.)+\S+>/ |
| describe MSGID_SPAM_LETTERS Spam tool Message-Id: (letters variant) |
| |
| |
| |
| # negative lookahead exempts this MUA from circa 1997-2000 |
| # X-Mailer: Microsoft Outlook Express 4.71.1712.3 |
| # Message-ID: <01bd45da$2649cdc0$LocalHost@andrew> |
| header __MSGID_DOLLARS_OK MESSAGEID =~ /<[0-9a-f]{4,}\$[0-9a-f]{4,}\$[0-9a-f]{4,}\@\S+>/ |
| header __MSGID_DOLLARS_MAYBE MESSAGEID =~ /<\w{4,}\$\w{4,}\$(?!localhost)\w{4,}\@\S+>/i |
| meta MSGID_DOLLARS_RANDOM __MSGID_DOLLARS_MAYBE && !__MSGID_DOLLARS_OK |
| |
| # bit of a ratware rule, but catches a bit more than just the one ratware |
| header __MSGID_RANDY Message-ID =~ /<[a-z\d][a-z\d\$-]{10,29}[a-z\d]\@[a-z\d][a-z\d.]{3,12}[a-z\d]>/ |
| # heuristic to eliminate most good Message-ID formats |
| header __MSGID_OK_HEX Message-ID =~ /\b[a-f\d]{8}\b/ |
| header __MSGID_OK_DIGITS Message-ID =~ /\d{10}/ |
| header __MSGID_OK_HOST Message-ID =~ /\@(?:\D{2,}|(?:\d{1,3}\.){3}\d{1,3})>/ |
| meta MSGID_RANDY (__MSGID_RANDY && !(__MSGID_OK_HEX || __MSGID_OK_DIGITS || __MSGID_OK_HOST)) |
| describe MSGID_RANDY Message-Id has pattern used in spam |
| |
| # bug 3395 |
| header MSGID_YAHOO_CAPS Message-ID =~ /<[A-Z]+\@yahoo.com>/ |
| describe MSGID_YAHOO_CAPS Message-ID has ALLCAPS@yahoo.com |
| |
| ########################################################################### |
| |
| header __AT_AOL_MSGID MESSAGEID =~ /\@aol\.com\b/i |
| header __FROM_AOL_COM From =~ /\@aol\.com\b/i |
| meta FORGED_MSGID_AOL (__AT_AOL_MSGID && !__FROM_AOL_COM) |
| describe FORGED_MSGID_AOL Message-ID is forged, (aol.com) |
| |
| header __AT_EXCITE_MSGID MESSAGEID =~ /\@excite\.com\b/i |
| header __MY_RCVD_EXCITE Received =~ /\.excite\.com\b/i |
| meta FORGED_MSGID_EXCITE (__AT_EXCITE_MSGID && !__MY_RCVD_EXCITE) |
| describe FORGED_MSGID_EXCITE Message-ID is forged, (excite.com) |
| |
| header __AT_HOTMAIL_MSGID MESSAGEID =~ /\@hotmail\.com\b/i |
| header __FROM_HOTMAIL_COM From =~ /\@hotmail\.com\b/i |
| meta FORGED_MSGID_HOTMAIL (__AT_HOTMAIL_MSGID && (!__FROM_HOTMAIL_COM && !__FROM_MSN_COM && !__FROM_YAHOO_COM)) |
| describe FORGED_MSGID_HOTMAIL Message-ID is forged, (hotmail.com) |
| |
| header __AT_MSN_MSGID MESSAGEID =~ /\@msn\.com\b/i |
| header __FROM_MSN_COM From =~ /\@msn\.com\b/i |
| meta FORGED_MSGID_MSN (__AT_MSN_MSGID && (!__FROM_MSN_COM && !__FROM_HOTMAIL_COM && !__FROM_YAHOO_COM)) |
| describe FORGED_MSGID_MSN Message-ID is forged, (msn.com) |
| |
| header __AT_YAHOO_MSGID MESSAGEID =~ /\@yahoo\.com\b/i |
| header __FROM_YAHOO_COM From =~ /\@yahoo\.com\b/i |
| meta FORGED_MSGID_YAHOO (__AT_YAHOO_MSGID && !__FROM_YAHOO_COM) |
| describe FORGED_MSGID_YAHOO Message-ID is forged, (yahoo.com) |
| |
| ########################################################################### |
| |
| header __MSGID_BEFORE_RECEIVED ALL =~ /^Message-Id:.*?^Received:/msi |
| header __MSGID_BEFORE_OKAY Message-Id =~ /\@[a-z0-9.-]+\.(?:yahoo|wanadoo)(?:\.[a-z]{2,3}){1,2}>/ |
| |
| meta MSGID_FROM_MTA_HEADER (__MSGID_BEFORE_RECEIVED && !__MSGID_BEFORE_OKAY && !__FROM_HOTMAIL_COM) |
| describe MSGID_FROM_MTA_HEADER Message-Id was added by a relay |
| |
| |
| |
| header MSGID_SHORT MESSAGEID =~ /^.{1,15}$|<.{0,4}\@/ |
| describe MSGID_SHORT Message-ID is unusually short |
| |
| #DEMOTED TO SANDBOX - 2012-03-21 |
| #header MSGID_MULTIPLE_AT MESSAGEID =~ /<[^>]*\@[^>]*\@/ |
| #describe MSGID_MULTIPLE_AT Message-ID contains multiple '@' characters |
| |
| ########################################################################### |
| |
| header DATE_SPAMWARE_Y2K Date =~ /^[A-Z][a-z]{2}, \d\d [A-Z][a-z]{2} [0-6]\d \d\d:\d\d:\d\d [A-Z]{3}$/ |
| describe DATE_SPAMWARE_Y2K Date header uses unusual Y2K formatting |
| |
| # as noted on the dev@ list, ":60" is valid for seconds when there's a leap |
| # second (12/31/2005 for instance), so let's accept that as valid. ISO 8601 |
| # apparently allows for it. |
| # there were a few whitespace issues in the original RE, and I wanted to avoid my |
| # two common, but yes invalid, date headers. specifically / \(GMT\)$/ and |
| # / 0000 GMT$/. dos has / "GMT"$/ - tvd |
| # 2.229 2.7267 0.0517 0.981 0.86 0.00 INVALID_DATE |
| # 2.263 2.7486 0.1368 0.953 0.78 0.00 INVALID_DATE_OLD |
| # |
| # WRT the tests, remember that ok and fail are reversed -- so valid dates |
| # should be "fail" and invalid dates should be "ok". |
| header INVALID_DATE Date !~ /^\s*(?:(?i:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\s)?\s*(?:[12]\d|3[01]|0?[1-9])\s+(?i:Jan|Feb|Ma[ry]|Apr|Ju[nl]|Aug|Sep|Oct|Nov|Dec)\s+(?:19[7-9]\d|2\d{3})\s+(?:[01]?\d|2[0-3])\:[0-5]\d(?::(?:[0-5]\d|60))?(?:\s+[AP]M)?(?:\s+(?:[+-][0-9]{4}|UT|[A-Z]{2,3}T|0000 GMT|"GMT"))?(?:\s*\(.*\))?\s*$/ [if-unset: Wed, 31 Jul 2002 16:41:57 +0200] |
| describe INVALID_DATE Invalid Date: header (not RFC 2822) |
| test INVALID_DATE fail Sat, 31 Dec 2005 23:59:60 -0500 |
| test INVALID_DATE fail Wed, 31 Jul 2002 16:41:57 +0200 |
| test INVALID_DATE fail Sat, 31 Dec 2005 23:00:00 |
| test INVALID_DATE ok Sat, 31 Dec 2005 24:00:00 -0500 |
| test INVALID_DATE ok Thurs, 31 Jul 2002 16:41:57 +0200 |
| |
| # allow +1300, NZ timezone |
| header INVALID_DATE_TZ_ABSURD Date =~ /[-+](?!(?:0\d|1[0-4])(?:[03]0|[14]5))\d{4}$/ |
| describe INVALID_DATE_TZ_ABSURD Invalid Date: header (timezone does not exist) |
| |
| header INVALID_TZ_CST ALL =~ /[+-]\d\d[30]0(?<!-0600|-0500|\+0800|\+0930|\+1030)\s+(?:\bCST\b|\(CST\))/ |
| describe INVALID_TZ_CST Invalid date in header (wrong CST timezone) |
| |
| header INVALID_TZ_EST ALL =~ /[+-]\d\d[30]0(?<!-0500|-0300|\+1000|\+1100)\s+(?:\bEST\b|\(EST\))/ |
| describe INVALID_TZ_EST Invalid date in header (wrong EST timezone) |
| |
| |
| ########################################################################### |
| # MIME encoding with spam characteristics |
| |
| ifplugin Mail::SpamAssassin::Plugin::HeaderEval |
| meta __SUBJECT_NEEDS_MIME __SUBJ_ILLEGAL_CHARS |
| endif |
| |
| header __SUBJECT_ENCODED_QP Subject:raw =~ /=\?\S+\?Q\?/i |
| header __SUBJECT_ENCODED_B64 Subject:raw =~ /=\?\S+\?B\?/i |
| |
| |
| |
| header __FROM_NEEDS_MIME From:name:raw =~ /[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff]/ |
| header __FROM_NEEDS_MIME2 From:name =~ /[\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff]/ |
| header __FROM_ENCODED_QP From:raw =~ /=\?\S+\?Q\?/i |
| header __FROM_ENCODED_B64 From:raw =~ /=\?\S+\?B\?/i |
| |
| |
| meta FROM_EXCESS_BASE64 __FROM_ENCODED_B64 && !__FROM_NEEDS_MIME2 |
| describe FROM_EXCESS_BASE64 From: base64 encoded unnecessarily |
| |
| |
| ########################################################################### |
| # ADV tags in various languages |
| |
| header ENGLISH_UCE_SUBJECT Subject =~ /^[^0-9a-z]*adv(?:ert)?\b/i |
| describe ENGLISH_UCE_SUBJECT Subject contains an English UCE tag |
| |
| # alan premselaar <alien@12inch.com>, see SpamAssassin-talk list 2003-03 |
| # quinlan: 2003-03-23 here are more generic Japanese iso-2022-jp codes |
| # ("not yet acceptance" or "email") + "announcement" |
| # FWIW, according to Peter Evans, this should be sufficient to catch the |
| # UCE tag and a common attempt at evasion (using the "sue" instead of |
| # "mi" Chinese character). 2006-10-12: updated by bug 4021. |
| header JAPANESE_UCE_SUBJECT Subject =~ /\e\$B.*(?:L\$>5Bz|EE;R%a!<%k)(?:8x|9-)9p/ |
| describe JAPANESE_UCE_SUBJECT Subject contains a Japanese UCE tag |
| |
| # check body for "shou nin daku kou koku" UCE tag (bug 4021) |
| body __JAPANESE_UCE_BODY /(?:L\$>5Bz|EE;R%a!<%k)(?:8x|9-)9p/ |
| |
| meta JAPANESE_UCE_BODY (__ISO_2022_JP_DELIM && __JAPANESE_UCE_BODY) |
| describe JAPANESE_UCE_BODY Body contains Japanese UCE tag |
| |
| # quinlan: "advertisement" in Russian KOI8-R |
| # (no longer common, but worth noting in future) |
| #header RUSSIAN_UCE_SUBJECT Subject =~ /\xf0\xe5\xea\xeb\xe0\xec\xf3/ |
| #describe RUSSIAN_UCE_SUBJECT Subject contains a Russian UCE tag |
| |
| # Korean UCE Subject: lines are usually 8-bit, but are occasionally encoded |
| # with quoted-printable or base64. |
| # |
| # \xbc\xba\xc0\xce means "adult" |
| # \xb1\xa4\xb0\xed means "advertisement" |
| # \xc1\xa4\xba\xb8 means "information" |
| # \xc8\xab\xba\xb8 means "publicity" |
| # |
| # Each two byte sequence is one Korean letter; the spaces and periods are |
| # sometimes used to obscure the words. \xb1\xa4\xb0\xed is the most common |
| # tag and is sometimes very obscured so we look harder. |
| # |
| header KOREAN_UCE_SUBJECT Subject =~ /[({[<][. ]*(?-i:\xbc\xba[. ]*\xc0\xce[. ]*)?(?-i:\xb1\xa4(?:[. ]*|[\x00-\x7f]{0,3})\xb0\xed|\xc1\xa4[. ]*\xba\xb8|\xc8\xab[. ]*\xba\xb8)[. ]*[)}\]>]/ |
| describe KOREAN_UCE_SUBJECT Subject: contains Korean unsolicited email tag |
| |
| ########################################################################### |
| |
| # two reliable signatures |
| header __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/ |
| header __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};/ |
| # loose match |
| header __DOUBLE_IP_LOOSE Received =~ /(?:\b(?:from|by)\b.{1,4}\b\d{1,3}[._-]\d{1,3}[._-]\d{1,3}[._-]\d{1,3}(?<!127\.0\.0\.1)\b.{0,4}){2}/i |
| # spam signature |
| meta RCVD_DOUBLE_IP_SPAM (__DOUBLE_IP_SPAM_1 || __DOUBLE_IP_SPAM_2) |
| describe RCVD_DOUBLE_IP_SPAM Bulk email fingerprint (double IP) found |
| # other matches |
| meta RCVD_DOUBLE_IP_LOOSE (__DOUBLE_IP_LOOSE && !RCVD_DOUBLE_IP_SPAM) |
| describe RCVD_DOUBLE_IP_LOOSE Received: by and from look like IP addresses |
| |
| header FORGED_TELESP_RCVD Received =~ /\.(?!br).. \(\d+-\d+-\d+-\d+\.dsl\.telesp\.net\.br / |
| describe FORGED_TELESP_RCVD Contains forged hostname for a DSL IP in Brazil |
| |
| # forgery meta-rules: more reliable than their inputs |
| meta CONFIRMED_FORGED (__FORGED_RCVD_TRAIL && (__FORGED_AOL_RCVD || __FORGED_HOTMAIL_RCVD || __FORGED_EUDORAMAIL_RCVD || FORGED_YAHOO_RCVD || __FORGED_JUNO_RCVD || FORGED_GMAIL_RCVD)) |
| describe CONFIRMED_FORGED Received headers are forged |
| |
| meta MULTI_FORGED ((__FORGED_AOL_RCVD + __FORGED_HOTMAIL_RCVD + __FORGED_EUDORAMAIL_RCVD + FORGED_YAHOO_RCVD + __FORGED_JUNO_RCVD + FORGED_GMAIL_RCVD) > 1) |
| describe MULTI_FORGED Received headers indicate multiple forgeries |
| |
| header NONEXISTENT_CHARSET Content-Type =~ /charset=.?DEFAULT/ |
| describe NONEXISTENT_CHARSET Character set doesn't exist |
| |
| header __HAS_MESSAGE_ID exists:Message-Id |
| priority __HAS_MESSAGE_ID -2000 # Bug 8078 |
| meta MISSING_MID !__HAS_MESSAGE_ID |
| describe MISSING_MID Missing Message-Id: header |
| |
| header __HAS_DATE exists:Date |
| priority __HAS_DATE -2000 # Bug 8078 |
| meta MISSING_DATE !__HAS_DATE |
| describe MISSING_DATE Missing Date: header |
| |
| header __HAS_SUBJECT exists:Subject |
| priority __HAS_SUBJECT -2000 # Bug 8078 |
| meta MISSING_SUBJECT !__HAS_SUBJECT |
| describe MISSING_SUBJECT Missing Subject: header |
| |
| # bug 6353 |
| header __HAS_FROM exists:From |
| priority __HAS_FROM -2000 # Bug 8078 |
| meta MISSING_FROM !__HAS_FROM |
| describe MISSING_FROM Missing From: header |
| |
| # bug 6149: avoid common .jp false positives |
| header __GAPPY_SUBJECT Subject =~ /\b(?:[a-z]([-_. =~\/:,*!\@\#\$\%\^&+;\"\'<>\\])\1{0,2}){4}/i |
| meta GAPPY_SUBJECT (__GAPPY_SUBJECT && !__ISO_2022_JP_DELIM) |
| describe GAPPY_SUBJECT Subject: contains G.a.p.p.y-T.e.x.t |
| |
| ### header existence tests (description is added automatically) |
| |
| # X-Fix example: NTMail fixed non RFC822 compliant EMail message |
| # |
| # X-PMFLAGS is all caps |
| # |
| # Headers that seem to only be used by a single spamming software and |
| # are found together in the same message: |
| # 1. X-MailingID and X-ServerHost |
| # 2. X-Stormpost-To and X-List-Unsubscribe |
| # |
| # not spammish: X-EM-Registration, X-EM-Version, X-Antiabuse, X-List-Host, |
| # X-Message-Id |
| # bad FP rate: Comment, Date-warning |
| |
| header PREVENT_NONDELIVERY exists:Prevent-NonDelivery-Report |
| describe PREVENT_NONDELIVERY Message has Prevent-NonDelivery-Report header |
| |
| header X_IP exists:X-IP |
| describe X_IP Message has X-IP header |
| |
| header __HAS_MIMEOLE exists:X-MimeOLE |
| header __HAS_MSMAIL_PRI exists:X-MSMail-Priority |
| header __HAS_SQUIRRELMAIL_IN_MAILER X-Mailer =~ /SquirrelMail\b/ |
| # Ever growing Office version list without X-MimeOLE, bug 6346, 7122, 7463. |
| header __HAS_OFFICE1214_IN_MAILER X-Mailer =~ /^Microsoft (?:Office )?Outlook 1[2456]\.0/ |
| # CGP MAPI module fingerprint, to protect from MISSING_MIMEOLE |
| header __HAS_CGP_MAPI_IN_MAILER X-Mailer =~ /CommuniGate Pro MAPI/ |
| meta MISSING_MIMEOLE (__HAS_MSMAIL_PRI && !__HAS_MIMEOLE && !__HAS_SQUIRRELMAIL_IN_MAILER && !__HAS_OFFICE1214_IN_MAILER && !__HAS_CGP_MAPI_IN_MAILER && !__HDR_RCVD_TONLINEDE && !__MIME_BASE64 && !__DKIM_EXISTS) |
| describe MISSING_MIMEOLE Message has X-MSMail-Priority, but no X-MimeOLE |
| |
| header __HAS_X_MAILER exists:X-Mailer |
| |
| header __IS_EXCH X-MimeOLE =~ /Produced By Microsoft Exchange V/ |
| |
| header SUBJ_AS_SEEN Subject =~ /\bAs Seen/i |
| describe SUBJ_AS_SEEN Subject contains "As Seen" |
| |
| header SUBJ_DOLLARS Subject =~ /^\$[0-9.,]+\b/ |
| describe SUBJ_DOLLARS Subject starts with dollar amount |
| |
| |
| |
| |
| |
| |
| #DISABLING DUE TO POOR S/O 2012-09-27 |
| #header SUBJ_YOUR_DEBT Subject =~ /Your (?:Bills|Debt|Credit)/i |
| #describe SUBJ_YOUR_DEBT Subject contains "Your Bills" or similar |
| |
| header SUBJ_YOUR_FAMILY Subject =~ /Your Family/i |
| describe SUBJ_YOUR_FAMILY Subject contains "Your Family" |
| |
| |
| # the real services never HELO as 'foo.com', instead 'mail.foo.com' or |
| # something like that. Note: be careful when expanding this... legit dotcom |
| # HELOers include: hotmail.com, drizzle.com, lockergnome.com. |
| header RCVD_FAKE_HELO_DOTCOM Received =~ /^from (?:msn|yahoo|yourwebsite|lycos|excite|cs|aol|localhost|koreanmail|allexecs|mydomain|juno|eudoramail|compuserve|desertmail|excite|caramail)\.com \(/m |
| describe RCVD_FAKE_HELO_DOTCOM Received contains a faked HELO hostname |
| |
| header SUBJECT_DIET Subject =~ /\bLose .*(?:pounds|lbs|weight)/i |
| describe SUBJECT_DIET Subject talks about losing pounds |
| |
| |
| # MIME boundary tests; spam tools use distinctive patterns. |
| header MIME_BOUND_DD_DIGITS Content-Type =~ /boundary=\"--\d+\"/ |
| describe MIME_BOUND_DD_DIGITS Spam tool pattern in MIME boundary |
| header MIME_BOUND_DIGITS_15 Content-Type =~ /boundary=\"\d{15,}\"/ |
| describe MIME_BOUND_DIGITS_15 Spam tool pattern in MIME boundary |
| header MIME_BOUND_MANY_HEX Content-Type =~ /boundary="[\da-f]{8}(?:-[\da-f]{4}){3}-[\da-f]{12}"/ |
| describe MIME_BOUND_MANY_HEX Spam tool pattern in MIME boundary |
| |
| # note: the first alternation is anchored for speed |
| header TO_MALFORMED To !~ /(?:^|[^\S"])(?:(?:\"[^\"]+\"|\S+)\@\S+\.\S+|^\s*.+:\s*;|^\s*\"[^\"]+\":\s*;|^\s*\([^\)]*\)\s*$|<\S+(?:\!\S+){1,}>|^\s*$)/ [if-unset: unset@unset.unset] |
| describe TO_MALFORMED To: has a malformed address |
| |
| header __CD exists:Content-Disposition |
| header __CT exists:Content-Type |
| header __CTE exists:Content-Transfer-Encoding |
| header __MIME_VERSION exists:MIME-Version |
| header __CT_TEXT_PLAIN Content-Type =~ /^text\/plain\b/i |
| meta MIME_HEADER_CTYPE_ONLY (!__CD && !__CTE && __CT && !__MIME_VERSION && !__CT_TEXT_PLAIN) |
| describe MIME_HEADER_CTYPE_ONLY 'Content-Type' found without required MIME headers |
| |
| header WITH_LC_SMTP Received =~ /\swith\ssmtp;\s/ |
| describe WITH_LC_SMTP Received line contains spam-sign (lowercase smtp) |
| |
| |
| header SUBJ_BUY Subject =~ /^buy/i |
| describe SUBJ_BUY Subject line starts with Buy or Buying |
| |
| # seems to be ratware |
| header RCVD_AM_PM Received =~ /; [A-Z][a-z][a-z], \d{1,2} \d{4} \d{1,2}:\d\d:\d\d [AP]M [+-]\d{4}/ |
| describe RCVD_AM_PM Received headers forged (AM/PM) |
| |
| header __USER_AGENT_MSN X-Mailer =~ /^MSN Explorer / |
| |
| # host no longer exists according to administrator |
| header FAKE_OUTBLAZE_RCVD Received =~ /\.mr\.outblaze\.com/ |
| describe FAKE_OUTBLAZE_RCVD Received header contains faked 'mr.outblaze.com' |
| |
| |
| # thanks to David Ritz for passing this on |
| header UNCLOSED_BRACKET ALL =~ /\[\d+\r?\n/s |
| describe UNCLOSED_BRACKET Headers contain an unclosed bracket |
| |
| header FROM_DOMAIN_NOVOWEL From =~ /\@\S*[bcdfgjklmnpqrstvwxz]{7}/i |
| describe FROM_DOMAIN_NOVOWEL From: domain has series of non-vowel letters |
| tflags FROM_DOMAIN_NOVOWEL userconf # lock scores low |
| |
| header FROM_LOCAL_NOVOWEL From =~ /[bcdfgjklmnpqrstvwxz]{7}\S*\@/i |
| describe FROM_LOCAL_NOVOWEL From: localpart has series of non-vowel letters |
| tflags FROM_LOCAL_NOVOWEL userconf # lock scores low |
| |
| header FROM_LOCAL_HEX From =~ /[0-9a-f]{11}\S*\@/i |
| describe FROM_LOCAL_HEX From: localpart has long hexadecimal sequence |
| |
| header FROM_LOCAL_DIGITS From =~ /\d{11}\S*\@/i |
| describe FROM_LOCAL_DIGITS From: localpart has long digit sequence |
| |
| header __TOCC_EXISTS exists:ToCc |
| |
| header X_PRIORITY_CC ALL =~ /^X-Priority:.*?^Cc:/msi |
| describe X_PRIORITY_CC Cc: after X-Priority: (bulk email fingerprint) |
| |
| # catch non-RFC2047 compliant messages |
| # Apple Mail has a bug where headers will have whitespace around the encoded |
| # text, so try to ignore that |
| header BAD_ENC_HEADER ALL:raw =~ /=\?[^?\s]+\?[^?\s]\?\s*[^?]+\s(?!\?=)/ |
| describe BAD_ENC_HEADER Message has bad MIME encoding in the header |
| |
| |
| header __ML1 Precedence =~ m{\b(?:list|bulk)\b}i |
| meta __ML2 __HAS_LIST_ID |
| header __ML3 exists:List-Post |
| header __ML4 exists:Mailing-List |
| header __ML5 Return-Path:addr =~ m{^(?:[^\@]+-(?:request|bounces|admin|owner)|owner-[^\@]+)(?:\@|\z)}i |
| meta __VIA_ML __ML1 || __ML2 || __ML3 || __ML4 || __ML5 |
| describe __VIA_ML Mail from a mailing list |
| |
| |
| # some clueless mailing lists (like zmailer with an RFC822TABS option on) |
| # are replacing a leading space by a TAB in header fields From, To, |
| # Cc, Date (Bug 6429) |
| header __ML_TURNS_SP_TO_TAB Received =~ /\(ORCPT <rfc822;/ |
| describe __ML_TURNS_SP_TO_TAB A mailing list changing a space to a TAB |
| |
| |
| # must keep it in sync with https://www.iana.org/assignments/ipv4-address-space/ |
| header RCVD_ILLEGAL_IP X-Spam-Relays-Untrusted =~ / (?:by|ip)=(?=\d+\.\d+\.\d+\.\d+ )(?:(?:0|2(?:2[4-9]|[3-5]\d)|192\.0\.2|198\.51\.100|203\.0\.113)\.|(?:\d+\.){0,3}(?!(?:2(?:[0-4]\d|5[0-5])|[01]?\d\d?)\b))/ |
| describe RCVD_ILLEGAL_IP Received: contains illegal IP address |
| |
| |
| ########################################################################### |
| |
| ifplugin Mail::SpamAssassin::Plugin::HeaderEval |
| |
| header __FORGED_AOL_RCVD eval:check_for_fake_aol_relay_in_rcvd() |
| |
| header CHARSET_FARAWAY_HEADER eval:check_for_faraway_charset_in_headers() |
| describe CHARSET_FARAWAY_HEADER A foreign language charset used in headers |
| tflags CHARSET_FARAWAY_HEADER userconf |
| |
| ################################################################### |
| |
| # illegal characters that should be MIME encoded |
| # might want to exempt users using languages that don't use Latin |
| # alphabets, but do it in the eval |
| |
| # Will FP without 4.0 and UTF-8 support |
| if (version >= 4.000000) |
| header __SUBJ_ILLEGAL_CHARS eval:check_illegal_chars('Subject','0.00','2') |
| meta SUBJ_ILLEGAL_CHARS (__SUBJ_ILLEGAL_CHARS && !__FROM_YAHOO_COM) |
| header FROM_ILLEGAL_CHARS eval:check_illegal_chars('From','0.20','2') |
| header __HEAD_ILLEGAL_CHARS eval:check_illegal_chars('ALL','0.010','2') |
| meta HEAD_ILLEGAL_CHARS __HEAD_ILLEGAL_CHARS && !__SUBJ_ILLEGAL_CHARS && !FROM_ILLEGAL_CHARS |
| endif |
| if (version < 4.000000) |
| meta __SUBJ_ILLEGAL_CHARS 0 |
| meta SUBJ_ILLEGAL_CHARS 0 |
| meta FROM_ILLEGAL_CHARS 0 |
| meta __HEAD_ILLEGAL_CHARS 0 |
| meta HEAD_ILLEGAL_CHARS 0 |
| endif |
| |
| describe SUBJ_ILLEGAL_CHARS Subject: has too many raw illegal characters |
| describe FROM_ILLEGAL_CHARS From: has too many raw illegal characters |
| describe HEAD_ILLEGAL_CHARS Headers have too many raw illegal characters |
| |
| ################################################################### |
| |
| # a forged Hotmail message; host HELO'd as hotmail.com, but it wasn't |
| header __FORGED_HOTMAIL_RCVD eval:check_for_forged_hotmail_received_headers() |
| |
| # this, by comparison is more common: from was @hotmail.com, but it wasn't |
| header FORGED_HOTMAIL_RCVD2 eval:check_for_no_hotmail_received_headers() |
| describe FORGED_HOTMAIL_RCVD2 hotmail.com 'From' address, but no 'Received:' |
| |
| header __FORGED_EUDORAMAIL_RCVD eval:check_for_forged_eudoramail_received_headers() |
| |
| header FORGED_YAHOO_RCVD eval:check_for_forged_yahoo_received_headers() |
| describe FORGED_YAHOO_RCVD 'From' yahoo.com does not match 'Received' headers |
| |
| if (version >= 3.004002) |
| header FORGED_GMAIL_RCVD eval:check_for_forged_gmail_received_headers() |
| describe FORGED_GMAIL_RCVD 'From' gmail.com does not match 'Received' headers |
| endif |
| |
| header __FORGED_JUNO_RCVD eval:check_for_forged_juno_received_headers() |
| |
| |
| |
| header SORTED_RECIPS eval:sorted_recipients() |
| describe SORTED_RECIPS Recipient list is sorted by address |
| |
| header SUSPICIOUS_RECIPS eval:similar_recipients('0.65','undef') |
| describe SUSPICIOUS_RECIPS Similar addresses in recipient list |
| |
| # this is a quite common false positive, as it's legal to remove a To but leave |
| # a CC. so don't score it high. |
| header MISSING_HEADERS eval:check_for_missing_to_header() |
| describe MISSING_HEADERS Missing To: header |
| |
| header DATE_IN_PAST_03_06 eval:check_for_shifted_date('-6', '-3') |
| describe DATE_IN_PAST_03_06 Date: is 3 to 6 hours before Received: date |
| |
| header DATE_IN_PAST_06_12 eval:check_for_shifted_date('-12', '-6') |
| describe DATE_IN_PAST_06_12 Date: is 6 to 12 hours before Received: date |
| |
| header DATE_IN_PAST_12_24 eval:check_for_shifted_date('-24', '-12') |
| describe DATE_IN_PAST_12_24 Date: is 12 to 24 hours before Received: date |
| |
| header DATE_IN_PAST_24_48 eval:check_for_shifted_date('-48', '-24') |
| describe DATE_IN_PAST_24_48 Date: is 24 to 48 hours before Received: date |
| |
| |
| header DATE_IN_PAST_96_XX eval:check_for_shifted_date('undef', '-96') |
| describe DATE_IN_PAST_96_XX Date: is 96 hours or more before Received: date |
| |
| header DATE_IN_FUTURE_03_06 eval:check_for_shifted_date('3', '6') |
| describe DATE_IN_FUTURE_03_06 Date: is 3 to 6 hours after Received: date |
| |
| header DATE_IN_FUTURE_06_12 eval:check_for_shifted_date('6', '12') |
| describe DATE_IN_FUTURE_06_12 Date: is 6 to 12 hours after Received: date |
| |
| header DATE_IN_FUTURE_12_24 eval:check_for_shifted_date('12', '24') |
| describe DATE_IN_FUTURE_12_24 Date: is 12 to 24 hours after Received: date |
| |
| header DATE_IN_FUTURE_24_48 eval:check_for_shifted_date('24', '48') |
| describe DATE_IN_FUTURE_24_48 Date: is 24 to 48 hours after Received: date |
| |
| header DATE_IN_FUTURE_48_96 eval:check_for_shifted_date('48', '96') |
| describe DATE_IN_FUTURE_48_96 Date: is 48 to 96 hours after Received: date |
| |
| #header DATE_IN_FUTURE_96_XX eval:check_for_shifted_date('96', 'undef') |
| meta DATE_IN_FUTURE_96_XX (0) |
| describe DATE_IN_FUTURE_96_XX Date: is 96 hours or more after Received: date |
| |
| header UNRESOLVED_TEMPLATE eval:check_unresolved_template() |
| describe UNRESOLVED_TEMPLATE Headers contain an unresolved template |
| |
| header SUBJ_ALL_CAPS eval:subject_is_all_caps() |
| describe SUBJ_ALL_CAPS Subject is all capitals |
| |
| |
| header LOCALPART_IN_SUBJECT eval:check_for_to_in_subject('user') |
| describe LOCALPART_IN_SUBJECT Local part of To: address appears in Subject |
| |
| header MSGID_OUTLOOK_INVALID eval:check_outlook_message_id() |
| describe MSGID_OUTLOOK_INVALID Message-Id is fake (in Outlook Express format) |
| |
| header HEADER_COUNT_CTYPE eval:check_header_count_range('Content-Type','2','999') |
| describe HEADER_COUNT_CTYPE Multiple Content-Type headers found |
| |
| endif |
| |
| ########################################################################### |
| |
| ifplugin Mail::SpamAssassin::Plugin::MIMEEval |
| |
| # this is also mostly-theoretical, so allow 0 hits |
| header HEAD_LONG eval:check_msg_parse_flags('truncated_header') |
| describe HEAD_LONG Message headers are very long |
| tflags HEAD_LONG userconf |
| |
| header MISSING_HB_SEP eval:check_msg_parse_flags('missing_head_body_separator') |
| describe MISSING_HB_SEP Missing blank line between message header and body |
| tflags MISSING_HB_SEP userconf |
| |
| endif |
| |
| ########################################################################### |
| |
| ifplugin Mail::SpamAssassin::Plugin::RelayEval |
| |
| header __UNPARSEABLE_RELAY_COUNT eval:check_relays_unparseable() |
| tflags __UNPARSEABLE_RELAY_COUNT userconf |
| |
| meta UNPARSEABLE_RELAY (__UNPARSEABLE_RELAY_COUNT >= 1) |
| tflags UNPARSEABLE_RELAY userconf |
| describe UNPARSEABLE_RELAY Informational: message has unparseable relay lines |
| |
| |
| header RCVD_HELO_IP_MISMATCH eval:helo_ip_mismatch() |
| describe RCVD_HELO_IP_MISMATCH Received: HELO and IP do not match, but should |
| |
| # not used directly right now due to FPs; but CONFIRMED_FORGED turns it |
| # into a 1.0 S/O rule anyway, so that's not a problem ;) |
| # 2.626 3.6340 1.5251 0.704 0.34 1.44 FORGED_RCVD_TRAIL |
| # 0.956 3.3890 0.0000 1.000 0.98 4.30 CONFIRMED_FORGED |
| header __FORGED_RCVD_TRAIL eval:check_for_forged_received_trail() |
| |
| header NO_RDNS_DOTCOM_HELO eval:check_for_no_rdns_dotcom_helo() |
| describe NO_RDNS_DOTCOM_HELO Host HELO'd as a big ISP, but had no rDNS |
| |
| endif |
| |
| ifplugin Mail::SpamAssassin::Plugin::HeaderEval |
| |
| header __ENV_AND_HDR_FROM_MATCH eval:check_for_matching_env_and_hdr_from() |
| |
| endif |
| |
