File: dovecot.rules

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sagan-rules 1:20170725-1
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# Sagan dovecot.rules
# Copyright (c) 2009-2017, 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.
#
#*************************************************************

#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[DOVECOT] Authentication success"; content: "login"; content: "Login"; default_proto: tcp; classtype: successful-user; program: dovecot; reference: url,wiki.quadrantsec.com/bin/view/Main/5000264; sid:5000264; rev:2;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[DOVECOT] Failed login"; content: "Password mismatch"; default_proto: tcp; classtype: unsuccessful-user; program: dovecot; reference: url,wiki.quadrantsec.com/bin/view/Main/5000265; sid:5000265; rev:2;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[DOVECOT] Starting up"; content: "starting up"; default_proto: tcp; classtype: system-event; program: dovecot; reference: url,wiki.quadrantsec.com/bin/view/Main/5000266; sid:5000266; rev:2;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[DOVECOT] Fatal error"; content: "Fatal"; default_proto: tcp; classtype: program-error; program: dovecot; reference: url,wiki.quadrantsec.com/bin/view/Main/5000267; sid:5000267; rev:2;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[DOVECOT] Invalid username"; pcre: "/user not found|User not known|unknown user/i"; default_proto: tcp; classtype: unsuccessful-user; program: dovecot; reference: url,wiki.quadrantsec.com/bin/view/Main/5000268; sid:5000268; rev:2;)