File: imapd-correlated.rules

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# Sagan imapd-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.
#
#*************************************************************

alert any $HOME_NET any -> $EXTERNAL_NET any (msg: "[IMAPD-CORRELATED] Login after suspicious activity"; program: imapd*; content: "LOGIN,"; default_proto: tcp; default_dst_port: $IMAP_PORT; classtype: correlated-attack; parse_src_ip: 1; xbits: isset,by_src,recon|honeypot|exploit_attempt|brute_force; reference: url, wiki.quadrantsec.com/bin/view/Main/5002375; sid:5002375; rev:3;)
alert any $HOME_NET any -> $EXTERNAL_NET any (msg: "[IMAPD-CORRELATED] Logout after suspicious activity"; program: imapd*; content: "LOGOUT,"; default_proto: tcp; default_dst_port: $IMAP_PORT; classtype: correlated-attack; parse_src_ip: 1; xbits: isset,by_src,recon|honeypot|exploit_attempt|brute_force; reference: url, wiki.quadrantsec.com/bin/view/Main/5002376; sid:5002376; rev:3;)
alert any $HOME_NET any -> $EXTERNAL_NET any (msg: "[IMAPD-CORRELATED] Timeout after suspicious activity"; program: imapd*; content: "TIMEOUT,"; default_proto: tcp; default_dst_port: $IMAP_PORT; classtype: correlated-attack; parse_src_ip: 1; xbits: isset,by_src,recon|honeypot|exploit_attempt|brute_force; reference: url, wiki.quadrantsec.com/bin/view/Main/5002377; sid:5002377; rev:3;)
alert any $HOME_NET any -> $EXTERNAL_NET any (msg: "[IMAPD-CORRELATED] Disconnect after suspicious activity"; program: imapd*; content: "DISCONNECTED,"; default_proto: tcp; default_dst_port: $IMAP_PORT; classtype: correlated-attack; parse_src_ip: 1; xbits: isset,by_src,recon|honeypot|exploit_attempt|brute_force; reference: url, wiki.quadrantsec.com/bin/view/Main/5002378; sid:5002378; rev:3;)
alert any $HOME_NET any -> $EXTERNAL_NET any (msg: "[IMAPD-CORRELATED] Connection after suspicious activity"; program: imapd*; content: "Connection,"; default_proto: tcp; default_dst_port: $IMAP_PORT; classtype: correlated-attack; parse_src_ip: 1; xbits: isset,by_src,recon|honeypot|exploit_attempt|brute_force; reference: url, wiki.quadrantsec.com/bin/view/Main/5002379; sid:5002379; rev:3;)