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mail-server/resources/spamassassin/20_ratware.cf
mdecimus d4fe318812 Antispam implementation - part 1
2023-08-11 18:46:09 +02:00

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# SpamAssassin rules file: known spam mailers
#
# Sometimes these leave 'sent by mailername' fingerprints in the
# headers, which provide a nice way for us to catch them.
#
# 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>
#
###########################################################################
header RATWARE_EGROUPS X-Mailer =~ /eGroups Message Poster/
describe RATWARE_EGROUPS Bulk email fingerprint (eGroups) found
# Note that the tests which look at the "ALL" pseudoheader are slower than
# the specific header.
# 100% overlap with X-Stormpost-To: header, but seems wise to leave it in
header RATWARE_OE_MALFORMED X-Mailer =~ /^Microsoft Outlook Express \d(?:\.\d+){3} \w+$/
describe RATWARE_OE_MALFORMED X-Mailer has malformed Outlook Express version
header RATWARE_MOZ_MALFORMED User-Agent =~ /Mozilla\/5\.0\d\d/
describe RATWARE_MOZ_MALFORMED Bulk email fingerprint (Mozilla malformed) found
header RATWARE_MPOP_WEBMAIL X-Mailer =~ /mPOP Web-Mail/i
describe RATWARE_MPOP_WEBMAIL Bulk email fingerprint (mPOP Web-Mail)
###########################################################################
# Now, detect forgeries of real MUAs
#
# NOTE: these rules should specify version numbers!
# first define situations where servers rewrite message id so we can't use message id to detect forgeries
header __HOTMAIL_BAYDAV_MSGID MESSAGEID =~ /^<[A-Z]{3}\d+-(?:DAV|SMTP)\d+[A-Z0-9]{25}\@phx\.gbl>$/m
header __IPLANET_MESSAGING_SERVER Received =~ /iPlanet Messaging Server/
header __LYRIS_EZLM_REMAILER List-Unsubscribe =~ /<mailto:(?:leave-\S+|\S+-unsubscribe)\@\S+>$/
header __SYMPATICO_MSGID MESSAGEID =~ /^<BAYC\d+-PASMTP\d+[A-Z0-9]{25}\@CEZ\.ICE>$/m
header __WACKY_SENDMAIL_VERSION Received =~ /\/CWT\/DCE\)/
header __GROUPSIO_MSGID MESSAGEID =~ /^<[[:xdigit:]]+\.[[:xdigit:]]+\@groups.io>$/m
header __HAS_XORIGMSGID X-Orig-Message-Id =~ /^<.+\@.+>$/m
meta __GROUPSIO_GATED __GROUPSIO_MSGID && __HAS_XORIGMSGID
meta __UNUSABLE_MSGID (__LYRIS_EZLM_REMAILER || __GATED_THROUGH_RCVD_REMOVER || __WACKY_SENDMAIL_VERSION || __IPLANET_MESSAGING_SERVER || __HOTMAIL_BAYDAV_MSGID || __SYMPATICO_MSGID && __GROUPSIO_GATED)
## now on to the forgery rules
# AOL
header __AOL_MUA X-Mailer =~ /\bAOL\b/
# Internet Mail Service
header __IMS_MUA X-Mailer =~ /Internet Mail Service/
header __IMS_MSGID MESSAGEID =~ /^<[A-F\d]{36,40}\@\S+>$/m
meta FORGED_MUA_IMS (__IMS_MUA && !__IMS_MSGID && !__UNUSABLE_MSGID)
describe FORGED_MUA_IMS Forged mail pretending to be from IMS
# Message ID format introduced by Vista MAPI, maybe also Windows 2003 Server SP2
header __VISTA_MSGID MESSAGEID =~ /^<[A-F\d]{32}\@\S+>$/m
# Outlook Express 4, 5, and 6
header __OE_MUA X-Mailer =~ /\bOutlook Express [456]\./
header __OE_MSGID_1 MESSAGEID =~ /^<[A-Za-z0-9-]{7}[A-Za-z0-9]{20}\@hotmail\.com>$/m
header __OE_MSGID_2 MESSAGEID =~ /^<(?:[0-9a-f]{8}|[0-9a-f]{12})\$[0-9a-f]{8}\$[0-9a-f]{8}\@\S+>$/m
meta __FORGED_OE (__OE_MUA && !__OE_MSGID_1 && !__OE_MSGID_2 && !__UNUSABLE_MSGID)
# Outlook versions that usually use "dollar signs"
header __OUTLOOK_DOLLARS_MUA X-Mailer =~ /^Microsoft Outlook(?: 8| CWS, Build 9|, Build 10)\./
header __OUTLOOK_DOLLARS_OTHER MESSAGEID =~ /^<\!\~\!/m
meta __FORGED_OUTLOOK_DOLLARS (__OUTLOOK_DOLLARS_MUA && !__OE_MSGID_2 && !__OUTLOOK_DOLLARS_OTHER && !__VISTA_MSGID && !__IMS_MSGID && !__UNUSABLE_MSGID)
# use new meta rules to implement FORGED_MUA_OUTLOOK rule from 2.60
# bug 7567: obviously fake Outlook X-Mailer
header __OUTLOOK_FAKE_MUA X-Mailer =~ /^Outlook$/
# bug 5496: avoid some FPs
header __FMO_EXCL_O3416 X-Mailer =~ /^Microsoft Outlook, Build 10.0.3416$/
header __FMO_EXCL_OE3790 X-Mailer =~ /^Microsoft Outlook Express 6.00.3790.3959$/
# bug 5910: __VISTA_MSGID also now used by Outlook Express from XP SP3
#
meta FORGED_MUA_OUTLOOK ((__FORGED_OE || __FORGED_OUTLOOK_DOLLARS || __OUTLOOK_FAKE_MUA) && !__FMO_EXCL_O3416 && !__FMO_EXCL_OE3790 && !__VISTA_MSGID)
describe FORGED_MUA_OUTLOOK Forged mail pretending to be from MS Outlook
# Outlook IMO (Internet Mail Only)
header __OIMO_MUA X-Mailer =~ /Outlook IMO/
header __OIMO_MSGID MESSAGEID =~ /^<[A-P]{28}\.[-\w.]+\@\S+>$/m
meta FORGED_MUA_OIMO (__OIMO_MUA && !__OIMO_MSGID && !__OE_MSGID_2 && !__UNUSABLE_MSGID)
describe FORGED_MUA_OIMO Forged mail pretending to be from MS Outlook IMO
# Not Ratware...
header __HAS_X_LOOP exists:X-Loop
header __HAS_X_MAILING_LIST exists:X-Mailing-List
header __HAS_X_MAILMAN_VERSION exists:X-Mailman-Version
describe MAILING_LIST_MULTI Multiple indicators imply a widely-seen list manager
meta MAILING_LIST_MULTI __HAS_X_LOOP + __HAS_X_MAILING_LIST + __HAS_X_MAILMAN_VERSION + __HAS_X_BEEN_THERE +__DOS_HAS_LIST_UNSUB + __ML1 + __ML2 + __ML3 + __ML4 + __ML5 > 2
tflags MAILING_LIST_MULTI nice
# QUALCOMM Eudora
# Note: uses X_LOOP and X_MAILING_LIST as subrules
# X-Mailer: QUALCOMM Windows Eudora Version 5.0 (and 5.1)
# X-Mailer: QUALCOMM Windows Eudora Version 6.0.0.22
# updated to fix bugs 2047, 2598, 2654
# NOTE: this is the *only* spammish Eudora MUA pattern that wasn't
# ignored using __OLD_EUDORA1 and __OLD_EUDORA2 under previous rules.
# v7 can't be tested, as it sometimes doesn't generate MID
header __EUDORA_MUA X-Mailer =~ /^QUALCOMM Windows Eudora (?:Pro |Light )?Version [3456]\./
header __EUDORA_MSGID MESSAGEID =~ /^<(?:\d\d?\.){3,5}\d{14}\.[a-f0-9]{8}\@\S+(?:\sport\s\d+)?>$/m
meta FORGED_MUA_EUDORA __EUDORA_MUA && !( __EUDORA_MSGID || __UNUSABLE_MSGID || MAILING_LIST_MULTI || MSGID_FROM_MTA_HEADER )
describe FORGED_MUA_EUDORA Forged mail pretending to be from Eudora
# From private mail with developers. Some top tips here!
header __THEBAT_MUA X-Mailer =~ /^The Bat!/
header __THEBAT_MUA_V1 X-Mailer =~ /^The Bat! \(v1\./
#header __THEBAT_MUA_V2 X-Mailer =~ /^The Bat! \(v2\./
#header __THEBAT_MUA_V3 X-Mailer =~ /^The Bat! \(v3\./
header __CTYPE_CHARSET_QUOTED Content-Type =~ /charset=\"/i
header __CTYPE_HAS_BOUNDARY Content-Type =~ /boundary/i
header __BAT_BOUNDARY Content-Type =~ /boundary=\"-{10}[A-F0-9]{4,}\"/
header __MAILMAN_21 X-Mailman-Version =~ /\d/
meta FORGED_MUA_THEBAT_CS (__THEBAT_MUA && __CTYPE_CHARSET_QUOTED && !__MAILMAN_21)
meta FORGED_MUA_THEBAT_BOUN (__THEBAT_MUA && __CTYPE_HAS_BOUNDARY && !__BAT_BOUNDARY && !__MAILMAN_21)
describe FORGED_MUA_THEBAT_CS Mail pretending to be from The Bat! (charset)
describe FORGED_MUA_THEBAT_BOUN Mail pretending to be from The Bat! (boundary)
# bug 4649: bulk mail sent via Yahoo! often looks forged, even when it is not
header __YAHOO_BULK Received =~ /from \[\S+\] by \S+\.(?:groups|scd|dcn)\.yahoo\.com with NNFMP/
meta FORGED_OUTLOOK_HTML (!__YAHOO_BULK && __ANY_OUTLOOK_MUA && MIME_HTML_ONLY)
describe FORGED_OUTLOOK_HTML Outlook can't send HTML message only
# bug 2525: FORGED_IMS_HTML fp'ing because new IMS *DOES* use text/html
# ctype. ARGH. This was noted in build 5.5.2656.59, so permit builds
# after that to get away with it.
header __IMS_HTML_BUILDS X-Mailer =~ /^Internet Mail Service .(?:[6789]\.|5\.[6789]|5\.5\.(?:[3456789]|2[789]|26[6789]|265[6789]))/
header __IMS_HTML_RCVD Received =~ /\bby \S+ with Internet Mail Service .(?:[6789]\.|5\.[6789]|5\.5\.(?:[3456789]|2[789]|26[6789]|265[6789]))/
meta FORGED_IMS_HTML (!__YAHOO_BULK && __IMS_MUA && MIME_HTML_ONLY && !(__IMS_HTML_BUILDS && __IMS_HTML_RCVD))
describe FORGED_IMS_HTML IMS can't send HTML message only
meta FORGED_THEBAT_HTML (__THEBAT_MUA_V1 && MIME_HTML_ONLY)
describe FORGED_THEBAT_HTML The Bat! can't send HTML message only
# bug 2513
header __REPTO_QUOTE Reply-To =~ /".*"\s*\</
meta REPTO_QUOTE_AOL __REPTO_QUOTE && __AOL_MUA
describe REPTO_QUOTE_AOL AOL doesn't do quoting like this
meta REPTO_QUOTE_IMS __REPTO_QUOTE && __IMS_MUA
describe REPTO_QUOTE_IMS IMS doesn't do quoting like this
meta REPTO_QUOTE_MSN __REPTO_QUOTE && (__FROM_MSN_COM || __AT_MSN_MSGID)
describe REPTO_QUOTE_MSN MSN doesn't do quoting like this
meta REPTO_QUOTE_QUALCOMM __REPTO_QUOTE && __ANY_QUALCOMM_MUA
describe REPTO_QUOTE_QUALCOMM Qualcomm/Eudora doesn't do quoting like this
meta REPTO_QUOTE_YAHOO __REPTO_QUOTE && (__FROM_YAHOO_COM || __AT_YAHOO_MSGID)
describe REPTO_QUOTE_YAHOO Yahoo! doesn't do quoting like this
# bug 1561
# stronger version of USER_AGENT_APPLEMAIL
# Apple Mail doesn't send text/html at all (unless it's an attachment)
# It'll send text/plain, or multipart/alternative with text/plain and
# text/enriched parts (boundary of "Apple-Mail-\d--\d+"). It can, however,
# send a multipart/mixed with a single text/html attachment, so don't use
# MIME_HTML_ONLY.
# perhaps limit CTYPE to "text/plain", "multipart/alternative" with
# "text/plain" and "text/enhanced", or "multipart/mixed"?
# bug 4223: expand for new Apple Mail version format
header __X_MAILER_APPLEMAIL X-Mailer =~ /^Apple Mail \(\d\.\d+(?:\.\d+)?\)$/
header __MSGID_APPLEMAIL Message-Id =~ /^<[0-9A-F]{8}-(?:[0-9A-F]{4}-){3}[0-9A-F]{12}\@\S+>$/
header __MIME_VERSION_APPLEMAIL Mime-Version =~ /^1\.0 \(Apple Message framework v\d+(?:\.\d+)?\)$/
meta __USER_AGENT_APPLEMAIL !__CTYPE_HTML && __X_MAILER_APPLEMAIL && (__MSGID_APPLEMAIL || __MIME_VERSION_APPLEMAIL)
# 2003-02-23: quinlan
# some useful meta rule sub-elements
header __CTYPE_HTML Content-Type =~ /text\/html/i
header __ANY_IMS_MUA X-Mailer =~ /^Internet Mail Service\b/
header __ANY_OUTLOOK_MUA X-Mailer =~ /^Microsoft (?:Office )?Outlook\b/
header __ANY_QUALCOMM_MUA X-Mailer =~ /\bQUALCOMM\b/
meta FORGED_QUALCOMM_TAGS (__ANY_QUALCOMM_MUA && __MIME_HTML && !__TAG_EXISTS_HTML)
describe FORGED_QUALCOMM_TAGS QUALCOMM mailers can't send HTML in this format
meta FORGED_IMS_TAGS (!__YAHOO_BULK && __ANY_IMS_MUA && __MIME_HTML && !(__TAG_EXISTS_HTML && __TAG_EXISTS_HEAD && __TAG_EXISTS_META && __TAG_EXISTS_BODY))
describe FORGED_IMS_TAGS IMS mailers can't send HTML in this format
meta FORGED_OUTLOOK_TAGS (!__YAHOO_BULK && __ANY_OUTLOOK_MUA && __MIME_HTML && !(__TAG_EXISTS_HTML && __TAG_EXISTS_HEAD && __TAG_EXISTS_META && __TAG_EXISTS_BODY))
describe FORGED_OUTLOOK_TAGS Outlook can't send HTML in this format
# Send-Safe ratware (idea from Alan Curry)
# random alphanumerics, separated into groups of 16 by dashes (the first
# and last group may be shorter), with a lowercase "l" and a number
# appended. The final number is the length of the whole string not
# including the dashes or the "l<number>". Why? I have no idea. It's
# not a tracking code - the spamware does not save it locally.
#
# jm: it's specifically to throw off MIME base64 encoding, to evade AOL's
# filters.
#
# http://groups.google.com/groups?selm=atp1ip0n22%40enews3.newsguy.com
rawbody RATWARE_HASH_DASH /[a-z\d]-[a-z\d]{16}-[a-z\d]{1,16}(?-i:l)\d/i
describe RATWARE_HASH_DASH Contains a hashbuster in Send-Safe format
########################################################################
# Most ratware uses message templates I would guess.
# Here's two popular ones...
########################################################################
# This ratware always uses a +0000 TZ in the Date header, and has a multiplicity
# of From: header formats. ("From" header samples from Steven Champeon
# <schampeo.hesketh.com> via the spamtools.lists.abuse.net and SPAM-L lists).
#
# "First Last" <firstlast_[a-z][a-z]@somedomain> 1
# "First Last" <firstlast[a-z][a-z]@somedomain> 1
# "First Last" <first.last[a-z][a-z]@somedomain> 1
# "First Last" <first_last[a-z][a-z]@somedomain> 1
# "First Last" <first_last_[a-z][a-z]@somedomain> 1
# "First Last" <flast_[a-z][a-z]@somedomain> 2
# "First Last" <flast[a-z][a-z]@somedomain> 2
# "First Last" <f.last_[a-z][a-z]@somedomain> 2
# "First Last" <f.last[a-z][a-z]@somedomain> 2
# "First Last" <f_last[a-z][a-z]@somedomain> 2
# "First Last" <last[a-z][a-z]@somedomain> 3
# "First M. Last" <firstlast_[a-z][a-z]@somedomain> 4
# "First M. Last" <firstlast[a-z][a-z]@somedomain> 4
# "First M. Last" <first.m.last[a-z][a-z]@somedomain> 5
# "First M. Last" <firstmlast[a-z][a-z]@somedomain> 5
# "First M. Last" <firstmlast_[a-z][a-z]@somedomain> 5
# "First M. Last" <fmlast_[a-z][a-z]@somedomain> 6
# "First M. Last" <mlast[a-z][a-z]@somedomain> 7
# "First M. Last" <m.last[a-z][a-z]@somedomain> 7
header __0_TZ_1 From =~ /^\"(\w)(\w+) (\w+)\" <\1\2[\._]?\3_?[a-z][a-z]\@/i
header __0_TZ_2 From =~ /^\"(\w)(\w+) (\w+)\" <\1[\._]?\3_?[a-z][a-z]\@/i
header __0_TZ_3 From =~ /^\"(\w)(\w+) (\w+)\" <\3_?[a-z][a-z]\@/i
header __0_TZ_4 From =~ /^\"(\w)(\w+) (\w)\. (\w+)\" <\1\2[\._]?\4_?[a-z][a-z]\@/i
header __0_TZ_5 From =~ /^\"(\w)(\w+) (\w)\. (\w+)\" <\1\2[\._]?\3[\._]?\4_?[a-z][a-z]\@/i
header __0_TZ_6 From =~ /^\"(\w)(\w+) (\w)\. (\w+)\" <\1\3\4_?[a-z][a-z]\@/i
header __0_TZ_7 From =~ /^\"(\w)(\w+) (\w)\. (\w+)\" <\3[\._]?\4_?[a-z][a-z]\@/i
header __RATWARE_0_TZ_DATE Date =~ / \+0000$/
meta RATWARE_ZERO_TZ (__RATWARE_0_TZ_DATE && __CTYPE_HTML && (__0_TZ_1 || __0_TZ_2 || __0_TZ_3 || __0_TZ_4 || __0_TZ_5 || __0_TZ_6 || __0_TZ_7))
describe RATWARE_ZERO_TZ Bulk email fingerprint (+0000) found
header X_MESSAGE_INFO exists:X-Message-Info
describe X_MESSAGE_INFO Bulk email fingerprint (X-Message-Info) found
# case-sensitive rule
# only significant rules with no FPs, hit recently, on 2+ corpuses
header HEADER_SPAM ALL =~ /^(Alternate-Recipient|Antivirus|Approved|Delivery-Notification|Disclose-Recipients|Error-path|Language|Location|Mime-Subversion|Newsletter-ID|PID|Rot|UID|X-BounceTrace|X-CS-IP|X-Company-Address|X-Company-City|X-Company-Country|X-Company-State|X-Company-Zip|X-E(?:[Mm]ail)?|X-Encoding|X-Originating-Company|X-RMD-Text|X-SG4|X-SP-Track-ID|X-Webmail-Time|X-bounce-to):/m
describe HEADER_SPAM Bulk email fingerprint (header-based) found
header RATWARE_RCVD_PF Received =~ / \(Postfix\) with ESMTP id [^;]+\; \S+ \d+ \S+ \d+ \d+:\d+:\d+ \S+$/s
describe RATWARE_RCVD_PF Bulk email fingerprint (Received PF) found
header RATWARE_RCVD_AT Received =~ / by \S+\@\S+ with Microsoft SMTPSVC/
describe RATWARE_RCVD_AT Bulk email fingerprint (Received @) found
header __RCVD_WITH_EXCHANGE Received =~ /with Microsoft Exchange Server/
meta RATWARE_OUTLOOK_NONAME __MSGID_DOLLARS_OK && !__HAS_X_MAILER && !__RCVD_WITH_EXCHANGE
describe RATWARE_OUTLOOK_NONAME Bulk email fingerprint (Outlook no name) found
header __MIMEOLE_MS X-MIMEOLE =~ /^Produced By Microsoft MimeOLE/
meta RATWARE_MS_HASH __MSGID_DOLLARS_OK && !__MIMEOLE_MS && !__RCVD_WITH_EXCHANGE
describe RATWARE_MS_HASH Bulk email fingerprint (msgid ms hash) found
###########################################################################
ifplugin Mail::SpamAssassin::Plugin::HeaderEval
header __GATED_THROUGH_RCVD_REMOVER eval:gated_through_received_hdr_remover()
header __RATWARE_NAME_ID eval:check_ratware_name_id()
meta RATWARE_NAME_ID __RATWARE_0_TZ_DATE && __RATWARE_NAME_ID
describe RATWARE_NAME_ID Bulk email fingerprint (msgid from) found
header RATWARE_EFROM eval:check_ratware_envelope_from()
describe RATWARE_EFROM Bulk email fingerprint (envfrom) found
endif
###########################################################################
ifplugin Mail::SpamAssassin::Plugin::MIMEEval
body __MIME_HTML eval:check_for_mime_html()
endif
###########################################################################
ifplugin Mail::SpamAssassin::Plugin::HTMLEval
body __TAG_EXISTS_BODY eval:html_tag_exists('body')
body __TAG_EXISTS_HEAD eval:html_tag_exists('head')
body __TAG_EXISTS_HTML eval:html_tag_exists('html')
body __TAG_EXISTS_META eval:html_tag_exists('meta')
body __TAG_EXISTS_STYLE eval:html_tag_exists('style')
body __TAG_EXISTS_SCRIPT eval:html_tag_exists('script')
endif
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