File: su.rules

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# Sagan su.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.
#
#*************************************************************
# This is for both "su" and "sudo"

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] SUDO user NOT in sudoers"; content:"user NOT in sudoers"; classtype: unsuccessful-admin;program: sudo; reference: url,wiki.quadrantsec.com/bin/view/Main/5000024; sid: 5000024; rev:2;)
drop syslog $EXTERNAL_NET any -> $HOME_NET any (msg: "[SU] SUDO authentication failure - Brute force [3/5]"; content: "authentication failure"; classtype: unsuccessful-admin; normalize; program: sudo; after: track by_src, count 3, seconds 300; threshold: type limit, track by_src, count 5, seconds 300; fwsam: src, 1 day; reference: url,wiki.quadrantsec.com/bin/view/Main/5000025; sid: 5000025; rev:6;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[SU] SUDO authentication failure"; content: "authentication failure"; classtype: unsuccessful-admin; normalize; program: sudo; reference: url,wiki.quadrantsec.com/bin/view/Main/5001526; sid: 5001526; rev:3;) 
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] Successful su as root"; content:"Successful su for root"; classtype: successful-admin; program: su; reference: url,wiki.quadrantsec.com/bin/view/Main/5000027; normalize; sid: 5000027; rev:4;)
drop syslog $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] FAILED su - Brute force [5/5]"; content:"FAILED su"; classtype: unsuccessful-admin; program: su; after: track by_src, count 5, seconds 300; threshold: type limit, track by_src, count 5, seconds 300; fwsam: src, 1 day; reference: url,wiki.quadrantsec.com/bin/view/Main/5000028; sid: 5000028; rev:4;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] FAILED su"; content:"FAILED su"; classtype: unsuccessful-admin; program: su; reference: url,wiki.quadrantsec.com/bin/view/Main/5001527; sid: 5001527; rev:2;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] Three failed attempts to run sudo"; content: "3 incorrect password attempts"; classtype: unsuccessful-admin;program: sudo; reference: url,wiki.quadrantsec.com/bin/view/Main/5000132; sid: 5000132; rev:2;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] Successful sudo to ROOT executed"; content: "USER=root"; content: "COMMAND="; content:!"incorrect password attempts"; content:!"NOT in sudoers"; classtype: successful-admin;program: sudo; reference: url,wiki.quadrantsec.com/bin/view/Main/5000133; sid: 5000133; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] su as 'root' suceeded"; content: "su root"; content: "succeeded for root"; classtype: successful-admin; program: su; reference: url,wiki.quadrantsec.com/bin/view/Main/5000409; normalize; sid: 5000409; rev:4;)

#  Rules added by Brian Echeverry ( becheverry@quadrantsec.com) - 10/21/2015

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[SU] root password change attempt"; content:"passwd"; content: "root"; content:"HISTORY"; classtype: suspicious-command; program: -su|su; reference: url,wiki.quadrantsec.com/bin/view/Main/5002566; sid: 5002566; rev:3;)