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citrix-correlated.rules
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citrix-correlated.rules
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# Sagan citrix-correlated.rules
# Copyright (c) 2009-2020. Quadrant Information Security <www.quadrantsec.com>
# All rights reserved.
#
# Please submit any custom rules or ideas to [email protected] 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.
#
#*************************************************************
# Citrix applicances/devices/software
# Login/login attempt after recon/honeypot/exploit_attempt/brute_force (Champ Clark / 09/18/2015)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] Login after recon activity"; content: "SSLVPN LOGIN"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; parse_dst_ip: 2; xbits: isset,recon,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003228; sid:5003228; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] Login after honeypot activity"; content: "SSLVPN LOGIN"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; parse_dst_ip: 2; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003229; sid:5003229; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] Login after exploit attempt"; content: "SSLVPN LOGIN"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; parse_dst_ip: 2; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003230; sid:5003230; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] Login after brute force attempt"; content: "SSLVPN LOGIN"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; parse_dst_ip: 2; xbits: isset,brute_force,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003231; sid:5003231; rev:4;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] AAA LOGIN_FAILED after suspicious activity"; content: "AAA LOGIN_FAILED"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,by_src,recon|honeypot|exploit_attempt; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5002358; sid:5002358; rev:7;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] AAA LOGIN_FAILED after recon activity"; content: "AAA LOGIN_FAILED"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,recon,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003238; sid:5003238; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] AAA LOGIN_FAILED after honeypot activity"; content: "AAA LOGIN_FAILED"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003239; sid:5003239; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] AAA LOGIN_FAILED after exploit attempt"; content: "AAA LOGIN_FAILED"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003240; sid:5003240; rev:4;)
# These xbits can be very active. It's better to look at login/logoff. This doesnt scale well with Redis. You would have to
# use flexbits (mmap) or xbits with mmap rather than Redis.
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] SSLVPN HTTPREQUEST after recon activity"; content: "SSLVPN HTTPREQUEST"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,recon,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003241; sid:5003241; rev:4;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] SSLVPN HTTPREQUEST after honeypot activity"; content: "SSLVPN HTTPREQUEST"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003242; sid:5003242; rev:4;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] SSLVPN HTTPREQUEST after exploit attempt"; content: "SSLVPN HTTPREQUEST"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003243; sid:5003243; rev:4;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[CITRIX-CORRELATED] SSLVPN HTTPREQUEST after brute force activity"; content: "SSLVPN HTTPREQUEST"; default_proto: tcp; default_dst_port: $HTTPS_PORT; classtype: correlated-attack; parse_src_ip: 1; normalize; xbits: isset,brute_force,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,support.citrix.com/article/CTX123875; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003244; sid:5003244; rev:4;)