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# Emerging Threats
#
# This distribution may contain rules under two different licenses.
#
# Rules with sids 1 through 3464, and 100000000 through 100000908 are under the GPLv2.
# A copy of that license is available at http://www.gnu.org/licenses/gpl-2.0.html
#
# Rules with sids 2000000 through 2799999 are from Emerging Threats and are covered under the BSD License
# as follows:
#
#*************************************************************
# Copyright (c) 2003-2016, Emerging Threats
# All rights reserved.
#
# 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.
#
#*************************************************************
#
#
#
#
# This Ruleset is EmergingThreats Open optimized for suricata-1.3.
alert tcp $HOME_NET 23 -> $EXTERNAL_NET any (msg:"ET TELNET External Telnet Attempt To Cisco Device With No Telnet Password Set (Automatically Dissalowed Until Password Set)"; flow:from_server; content:"Password required, but none set"; depth:31; reference:url,doc.emergingthreats.net/bin/view/Main/2008860; classtype:attempted-admin; sid:2008860; rev:4;)
#alert tcp $HOME_NET 23 -> $EXTERNAL_NET any (msg:"ET TELNET External Telnet Login Prompt from Cisco Device"; flow:from_server,established; pcre:"/^(\r\n)*/"; content:"User Access Verification"; within:24; reference:url,doc.emergingthreats.net/bin/view/Main/2008861; classtype:attempted-admin; sid:2008861; rev:6;)
alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET SUSPICIOUS Path to BusyBox"; flow:to_server,established; content:"/bin/busybox"; flowbits:set,ET.telnet.busybox;threshold: type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:suspicious-filename-detect; sid:2023016; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET SUSPICIOUS busybox shell"; flow:to_server,established; content:"shell"; fast_pattern:only; pcre:"/\bshell\b/"; flowbits:isset,ET.telnet.busybox; flowbits:set,ET.telnet.busybox.shell;threshold: type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:attempted-admin; sid:2023017; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET SUSPICIOUS busybox enable"; flow:to_server,established; content:"enable"; fast_pattern:only; pcre:"/\benable\b/"; flowbits:set,ET.telnet.busybox.enable; flowbits:isset,ET.telnet.busybox;threshold: type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:attempted-admin; sid:2023018; rev:3;)
alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET busybox MIRAI hackers - Possible Brute Force Attack"; flow:to_server,established; content:"MIRAI"; flowbits:isset,ET.telnet.busybox; threshold: type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:attempted-admin; sid:2023019; rev:2;)
alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET busybox ECCHI hackers - Possible Brute Force Attack"; flow:to_server,established; content:"ECCHI"; flowbits:isset,ET.telnet.busybox; threshold: type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:attempted-admin; sid:2023304; rev:1;)
alert tcp $HOME_NET 23 -> $EXTERNAL_NET any (msg:"GPL TELNET Bad Login"; flow:from_server,established; content:"Login incorrect"; nocase; fast_pattern:only; classtype:bad-unknown; sid:2101251; rev:9;)
#alert tcp $TELNET_SERVERS 23 -> $EXTERNAL_NET any (msg:"GPL TELNET TELNET access"; flow:from_server,established; content:"|FF FD|"; rawbytes; content:"|FF FD|"; distance:0; rawbytes; content:"|FF FD|"; distance:0; rawbytes; reference:arachnids,08; reference:cve,1999-0619; reference:nessus,10280; classtype:not-suspicious; sid:2100716; rev:14;)
alert tcp $TELNET_SERVERS 23 -> $EXTERNAL_NET any (msg:"GPL TELNET TELNET login failed"; flow:from_server,established; content:"Login failed"; nocase; classtype:bad-unknown; sid:2100492; rev:10;)
alert tcp $TELNET_SERVERS 23 -> $EXTERNAL_NET any (msg:"GPL TELNET Telnet Root not on console"; flow:from_server,established; content:"not on system console"; fast_pattern:only; nocase; reference:arachnids,365; classtype:bad-unknown; sid:2100717; rev:9;)
alert tcp $TELNET_SERVERS 23 -> $EXTERNAL_NET any (msg:"GPL TELNET root login"; flow:from_server,established; content:"login|3A| root"; fast_pattern:only; classtype:suspicious-login; sid:2100719; rev:8;)
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