File: openssh-correlated.rules

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sagan-rules 1:20170725-1
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# Sagan openssh-correlated.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.
#
#*************************************************************


# Add by Champ Clark - 09/18/2015
# Login after previous recon xbit is set. 

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENSSH-CORRELATED] Authentication success via password after suspicious activity"; content: "Accepted password"; xbits: isset,by_src,recon|honeypot|exploit_attempt; default_proto: tcp; default_dst_port: $SSH_PORT; classtype: correlated-attack; reference: url,wiki.quadrantsec.com/bin/view/Main/5002353; normalize; program: sshd; sid:5002353; rev:6;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENSSH-CORRELATED] Authentication success via public key after suspicious activity"; content: "Accepted publickey"; xbits: isset,by_src,recon|honeypot|exploit_attempt; default_proto: tcp; default_dst_port: $SSH_PORT; classtype: correlated-attack; reference: url,wiki.quadrantsec.com/bin/view/Main/5002354; normalize; program: sshd; sid:5002354; rev:6;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENSSH-CORRELATED] Authentication success via keyboard-interactive after suspicious activity"; content: "Accepted keyboard-interactive"; xbits: isset,by_src,recon|honeypot|exploit_attempt; default_proto: tcp; default_dst_port: $SSH_PORT; classtype: correlated-attack; reference: url,wiki.quadrantsec.com/bin/view/Main/5002355; normalize; program: sshd; sid:5002355; rev:6;)

# Added by Champ Clark - 09/17/2014 - Required xbit.  Valid login _after_ brute force.

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENSSH-CORRELATED] SSH login success after brute force attack!"; pcre: "/accepted|authenticated/i"; xbits: isset,by_src,brute_force; xbits: set,attacker,86400; normalize; default_proto: tcp; default_dst_port: $SSH_PORT; classtype: correlated-attack; program: sshd; reference: url,wiki.quadrantsec.com/bin/view/Main/5002176; sid:5002177; rev:8;)

# We could later use "attacker.generic" to "track" the attacker! 

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[OPENSSH-CORRELATED] Accepted publickey after brute force attack!"; content: "Accepted publickey" ; xbits: isset,by_src,brute_force; xbits: set,attacker,86400; normalize; default_proto: tcp; default_dst_port: $SSH_PORT; classtype: correlated-attack; program: sshd; reference: url,wiki.quadrantsec.com/bin/view/Main/5002178; sid:5002178; rev:7;)