File: telnet.rules

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sagan-rules 1:20170725-1
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# Sagan telnet.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 $EXTERNAL_NET any -> $HOME_NET any (msg: "[TELNET] Connection refused by TCP Wrappers"; content: "refused connect from"; default_proto: tcp; default_dst_port: $TELNET_PORT; classtype: tcp-connection; program: telnetd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000243; sid: 5000243; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[TELNET] Remote host established a telnet connection"; content: "connection from"; default_proto: tcp; default_dst_port: $TELNET_PORT; classtype: not-suspicious; program: telnetd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000244; sid: 5000244; rev:3;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[TELNET] Remote host invalid connection"; content: "ttloop"; pcre: "/peer died|read/i"; default_proto: tcp; default_dst_port: $TELNET_PORT; classtype: network-event; program: telnetd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000245; sid: 5000245; rev:2;)
#alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[TELNET] Reverse lookup error"; content: "can't verify hostname"; default_proto: tcp; default_dst_port: $TELNET_PORT; classtype: network-event; program: telnetd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000246; sid: 5000246; rev:3;)
alert any $EXTERNAL_NET any -> $HOME_NET any (msg: "[TELNET] Attempt to login with an option"; content: "Attempt to login with an option"; default_proto: tcp; default_dst_port: $TELNET_PORT; classtype: exploit-attempt; program: telnetd; reference: url,wiki.quadrantsec.com/bin/view/Main/5000392; sid: 5000392; rev:3;)