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# Sagan sendmail.rules
# Copyright (c) 2009-2016, Quadrant Information Security <www.quadrantsec.com>
# All rights reserved.
#
# Please submit any custom rules or ideas to sagan-submit@quadrantsec.com or the sagan-sigs mailing list
#
#*************************************************************
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
# following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
# disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
# following disclaimer in the documentation and/or other materials provided with the distribution.
# * Neither the name of the nor the names of its contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#*************************************************************
drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] VRFY or EXPN root attempt"; content: " root"; nocase; pcre: "/vrfy|expn/i"; classtype: attempted-recon; flowbits: set, recon, 86400; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000034; fwsam: src, 1 day; parse_src_ip: 1; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000034; rev:7;)
drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] EXPN command - rejected"; content:"expn "; nocase; content:"[rejected]"; classtype: attempted-recon; flowbits: set, recon, 86400; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000035; parse_src_ip: 1; fwsam: src, 1 day; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000035; rev:7;)
drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] VRFY command - rejected"; content:"vrfy "; nocase; content:"[rejected]"; classtype: attempted-recon; flowbits: set, recon, 86400; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000036; parse_src_ip: 1; fwsam: src, 1 day; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000036; rev:7;)
drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] EXPN command - [not rejected]"; content:"expn "; content:!"rejected"; nocase; fwsam: src, 1 day; classtype: attempted-recon; flowbits: set, recon, 86400; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000035; parse_src_ip: 1; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000223; rev:8;)
drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] VRFY command - [not rejected]"; content:"vrfy "; content:!"rejected"; nocase; classtype: attempted-recon; flowbits: set, recon, 86400; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000036; parse_src_ip:1; fwsam: src, 1 day; reference:arachnids,31; reference:cve,1999-0531; reference:nessus,10249; sid: 5000224; rev:8;)
#drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Relaying denied"; pcre: "/Relaying denied|reject=550 5.7.1/"; classtype: suspicious-traffic;program: sm-mta|sendmail; parse_src_ip: 1; fwsam: src, 1 day; reference: url,wiki.quadrantsec.com/bin/view/Main/5000037; sid: 5000037; rev:8;)
#drop tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Relaying denied [reject=550 5.7.1]"; content: "reject=550 5.7.1"; classtype: suspicious-traffic;program: sm-mta|sendmail; parse_src_ip: 1; fwsam: src, 1 day; reference: url,wiki.quadrantsec.com/bin/view/Main/5000144; sid: 5000144; rev:5;)
#alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Domain of sender does not resolve"; content:"reject=451 4.1.8"; classtype: suspicious-traffic; program: sm-mta|sendmail; normalize; reference: url,wiki.quadrantsec.com/bin/view/Main/5000136; sid: 5000136; rev:4;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Rejected by access list"; pcre: "/reject=550 5.0.0|reject=553 5.3.0/"; classtype: suspicious-traffic; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000137; sid: 5000137; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"[SENDMAIL] Sender address does not have domain"; content:"reject=553 5.5.4 "; classtype: suspicious-traffic; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000138; sid: 5000138; rev:1;)
#alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Rejecting due to pre-greet"; content: "rejecting commands from"; classtype: spam; program: sm-mta|sendmail; parse_src_ip: 1; reference: url,wiki.quadrantsec.com/bin/view/Main/5000139; sid: 5000139; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Save mail panic"; content: "savemail panic"; classtype: program-error; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000140; sid: 5000140; rev:2;)
#alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Sendmail Spamassassin X-Spam-Score"; content: "X-Spam-Score"; classtype: spam; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000141; sid: 5000141; rev:2;)
#alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Possible SMTP RCPT flood, throttling"; content: "Possible SMTP RCPT flood, throttling"; classtype: spam; program: sm-mta|sendmail; parse_src_ip: 1; reference: url,wiki.quadrantsec.com/bin/view/Main/5000142; sid: 5000142; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg:"[SENDMAIL] Username with pipe symbol"; content: "|7c|"; content: "to=<"; classtype: exploit-attempt; program: sm-mta|sendmail; reference: url,wiki.quadrantsec.com/bin/view/Main/5000357; sid: 5000357; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg: "[SENDMAIL] SpamAssassin Milter Plugin Remote Arbitrary Command Injection Attempt"; parse_src_ip: 1; program: sm-mta|sendmail; content: "/bin/"; content: "sh "; content: "|7c|"; content: "+"; classtype: system-event; reference: url, wiki.quadrantsec.com/bin/view/Main/5000881; reference: url,http://www.securityfocus.com/bid/38578; sid: 5000881; rev: 6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg: "[SENDMAIL] Possible open proxy"; program: sm-mta|sendmail; content: "probable open proxy:"; parse_src_ip: 1; classtype: suspicious-traffic; flowbits: set, recon, 86400; reference: url, wiki.quadrantsec.com/bin/view/Main/5001013; sid: 5001013; rev: 6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET $SMTP_PORT (msg: "[SENDMAIL] Insufficient system resources [Remote] [0/5]"; program: sm-mta|sendmail; content: "Insufficient system resources"; classtype: program-error; threshold: type limit, track by_src, count 5, seconds 300; reference: url, wiki.quadrantsec.com/bin/view/Main/5001094; sid: 5001094; rev: 4;)
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