/etc/sagan-rules/telnet.rules is in sagan-rules 10212010-r1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | # Sagan telnet.rules
# Copyright (c) 2009-2010, Softwink, Inc.
# All rights reserved.
#
# Please submit any custom rules or ideas to sagan-submit@softwink.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 tcp $EXTERNAL_NET any -> $HOME_NET 23 (msg: "[TELNET] Connection refused by TCP Wrappers"; content: "refused connect from"; classtype: tcp-connection; program: telnetd; reference: url,wiki.softwink.com/bin/view/Main/5000243; sid: 5000243; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 23 (msg: "[TELNET] Remote host established a telnet connection"; content: "connection from"; classtype: not-suspicious; program: telnetd; reference: url,wiki.softwink.com/bin/view/Main/5000244; sid: 5000244; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 23 (msg: "[TELNET] Remote host invalid connection"; content: "ttloop"; pcre: "/peer died|read/i"; classtype: network-event; program: telnetd; reference: url,wiki.softwink.com/bin/view/Main/5000245; sid: 5000245; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 23 (msg: "[TELNET] Reverse lookup error"; content: "can't verify hostname"; classtype: network-event; program: telnetd; reference: url,wiki.softwink.com/bin/view/Main/5000246; sid: 5000246; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET 23 (msg: "[TELNET] Attempt to login with an option"; content: "Attempt to login with an option"; classtype: exploit-attempt; program: telnetd; reference: url,wiki.softwink.com/bin/view/Main/5000392; sid: 5000392; rev:1;)
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