# Sagan courier-correlated.rules
# Copyright (c) 2009-2020. 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.
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#*************************************************************

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Logout/disconnect after recon activity"; meta_content: "%sagan%",LOGOUT,DISCONNECTED; default_proto: tcp; classtype: not-suspicious; parse_src_ip: 1; program: imapd|imapd-ssl|courierlogger; xbits: isset,brute_force,track ip_src;  threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003245; sid:5003245; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Logout/disconnect after honeypot activity"; meta_content: "%sagan%",LOGOUT,DISCONNECTED; default_proto: tcp; classtype: not-suspicious; parse_src_ip: 1; program: imapd|imapd-ssl|courierlogger; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003246; sid:5003246; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Logout/disconnect after exploit attempt"; meta_content: "%sagan%",LOGOUT,DISCONNECTED; default_proto: tcp; classtype: not-suspicious; parse_src_ip: 1; program: imapd|imapd-ssl|courierlogger; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003247; sid:5003247; rev:4;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Logout/disconnect after brute force activity"; meta_content: "%sagan%",LOGOUT,DISCONNECTED; default_proto: tcp; classtype: not-suspicious; parse_src_ip: 1; program: imapd|imapd-ssl|courierlogger; xbits: isset,brute_force,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003248; sid:5003248; rev:4;)

alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] User login after recon activity"; content: "LOGIN,"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,recon,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003249; sid:5003249; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] User login after honeypot activity"; content: "LOGIN,"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003250; sid:5003250; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] User login after exploit attempt"; content: "LOGIN,"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003251; sid:5003251; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] User login after brute force activity"; content: "LOGIN,"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,brute_force,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003252; sid:5003252; rev:3;)


alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Timeout after recon activity"; content: "TIMEOUT"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,recon,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003253; sid:5003253; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Timeout after honeypot activity"; content: "TIMEOUT"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,honeypot,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003254; sid:5003254; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Timeout after exploit attempt"; content: "TIMEOUT"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,exploit_attempt,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003255; sid:5003255; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[COURIER-CORRELATED] Timeout after brute force activity"; content: "TIMEOUT"; parse_src_ip: 1; default_proto: tcp; classtype: successful-user; program: imapd|imapd-ssl|courierlogger; xbits: isset,brute_force,track ip_src; threshold: type suppress, track by_src, count 5, seconds 3600; reference: url,wiki.quadrantsec.com/bin/view/Main/5003256; sid:5003256; rev:3;)