/etc/snort/rules/chat.rules is in snort-rules-default 2.9.2.2-3.
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 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | # Copyright 2001-2005 Sourcefire, Inc. All Rights Reserved
#
# This file may contain proprietary rules that were created, tested and
# certified by Sourcefire, Inc. (the "VRT Certified Rules") as well as
# rules that were created by Sourcefire and other third parties and
# distributed under the GNU General Public License (the "GPL Rules"). The
# VRT Certified Rules contained in this file are the property of
# Sourcefire, Inc. Copyright 2005 Sourcefire, Inc. All Rights Reserved.
# The GPL Rules created by Sourcefire, Inc. are the property of
# Sourcefire, Inc. Copyright 2002-2005 Sourcefire, Inc. All Rights
# Reserved. All other GPL Rules are owned and copyrighted by their
# respective owners (please see www.snort.org/contributors for a list of
# owners and their respective copyrights). In order to determine what
# rules are VRT Certified Rules or GPL Rules, please refer to the VRT
# Certified Rules License Agreement.
#
#
# $Id: chat.rules,v 1.25.2.2.2.4 2005/07/22 19:19:54 mwatchinski Exp $
#-------------
# CHAT RULES
#-------------
# These signatures look for people using various types of chat programs (for
# example: AIM, ICQ, and IRC) which may be against corporate policy
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CHAT ICQ access"; flow:to_server,established; content:"User-Agent|3A|ICQ"; classtype:policy-violation; sid:541; rev:9;)
alert tcp $EXTERNAL_NET 80 -> $HOME_NET any (msg:"CHAT ICQ forced user addition"; flow:established,to_client; content:"Content-Type|3A| application/x-icq"; nocase; content:"[ICQ User]"; reference:bugtraq,3226; reference:cve,2001-1305; classtype:policy-violation; sid:1832; rev:7;)
alert tcp $HOME_NET any <> $EXTERNAL_NET 1863 (msg:"CHAT MSN message"; flow:established; content:"MSG "; depth:4; content:"Content-Type|3A|"; nocase; content:"text/plain"; distance:1; classtype:policy-violation; sid:540; rev:11;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 1863 (msg:"CHAT MSN outbound file transfer request"; flow:established; content:"MSG "; depth:4; content:"Content-Type|3A| application/x-msnmsgrp2p"; nocase; content:"INVITE"; distance:0; nocase; classtype:policy-violation; sid:1986; rev:6;)
alert tcp $EXTERNAL_NET 1863 -> $HOME_NET any (msg:"CHAT MSN outbound file transfer accept"; flow:established; content:"MSG "; depth:4; content:"Content-Type|3A| application/x-msnmsgrp2p"; distance:0; nocase; content:"MSNSLP/1.0 200 OK"; distance:0; nocase; classtype:policy-violation; sid:1988; rev:5;)
alert tcp $EXTERNAL_NET 1863 -> $HOME_NET any (msg:"CHAT MSN outbound file transfer rejected"; flow:established; content:"MSG "; depth:4; content:"Content-Type|3A| application/x-msnmsgrp2p"; distance:0; nocase; content:"MSNSLP/1.0 603 Decline"; distance:0; nocase; classtype:policy-violation; sid:1989; rev:6;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 1863 (msg:"CHAT MSN user search"; flow:to_server,established; content:"CAL "; depth:4; nocase; classtype:policy-violation; sid:1990; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 1863 (msg:"CHAT MSN login attempt"; flow:to_server,established; content:"USR "; depth:4; nocase; content:" TWN "; distance:1; nocase; threshold:type limit, track by_src, count 1, seconds 60; classtype:policy-violation; sid:1991; rev:2;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC nick change"; flow:to_server,established; content:"NICK "; offset:0; nocase; classtype:policy-violation; sid:542; rev:11;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC DCC file transfer request"; flow:to_server,established; content:"PRIVMSG "; offset:0; nocase; content:" |3A|.DCC SEND"; nocase; classtype:policy-violation; sid:1639; rev:6;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC DCC chat request"; flow:to_server,established; content:"PRIVMSG "; offset:0; nocase; content:" |3A|.DCC CHAT chat"; nocase; classtype:policy-violation; sid:1640; rev:6;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC channel join"; flow:to_server,established; content:"JOIN |3A| |23|"; offset:0; nocase; classtype:policy-violation; sid:1729; rev:5;)
alert tcp $HOME_NET any <> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC message"; flow:established; content:"PRIVMSG "; nocase; classtype:policy-violation; sid:1463; rev:6;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 6666:7000 (msg:"CHAT IRC dns request"; flow:to_server,established; content:"USERHOST "; offset:0; nocase; classtype:policy-violation; sid:1789; rev:3;)
alert tcp $EXTERNAL_NET 6666:7000 -> $HOME_NET any (msg:"CHAT IRC dns response"; flow:to_client,established; content:"|3A|"; offset:0; content:" 302 "; content:"=+"; classtype:policy-violation; sid:1790; rev:4;)
alert tcp $HOME_NET any -> $AIM_SERVERS any (msg:"CHAT AIM login"; flow:to_server,established; content:"*|02|"; depth:2; content:"|00 17 00 06|"; within:8; distance:4; classtype:policy-violation; sid:1631; rev:8;)
alert tcp $HOME_NET any -> $AIM_SERVERS any (msg:"CHAT AIM send message"; flow:to_server,established; content:"*|02|"; depth:2; content:"|00 04 00 06|"; depth:4; offset:6; classtype:policy-violation; sid:1632; rev:6;)
alert tcp $AIM_SERVERS any -> $HOME_NET any (msg:"CHAT AIM receive message"; flow:to_client; content:"*|02|"; depth:2; content:"|00 04 00 07|"; depth:4; offset:6; classtype:policy-violation; sid:1633; rev:6;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo IM successful logon"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00 01|"; depth:2; offset:10; classtype:policy-violation; sid:2450; rev:3;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo IM voicechat"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00|J"; depth:2; offset:10; classtype:policy-violation; sid:2451; rev:3;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 5050 (msg:"CHAT Yahoo IM ping"; flow:to_server,established; content:"YMSG"; depth:4; nocase; content:"|00 12|"; depth:2; offset:10; classtype:policy-violation; sid:2452; rev:4;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo IM conference invitation"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00 18|"; depth:2; offset:10; classtype:policy-violation; sid:2453; rev:3;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo IM conference logon success"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00 19|"; depth:2; offset:10; classtype:policy-violation; sid:2454; rev:3;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 5050 (msg:"CHAT Yahoo IM conference message"; flow:to_server,established; content:"YMSG"; depth:4; nocase; content:"|00 1D|"; depth:2; offset:10; classtype:policy-violation; sid:2455; rev:3;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo Messenger File Transfer Receive Request"; flow:established; content:"YMSG"; depth:4; content:"|00|M"; depth:2; offset:10; classtype:policy-violation; sid:2456; rev:4;)
alert tcp any any <> any 5101 (msg:"CHAT Yahoo IM message"; flow:established; content:"YMSG"; depth:4; nocase; classtype:policy-violation; sid:2457; rev:2;)
alert tcp $EXTERNAL_NET 5050 -> $HOME_NET any (msg:"CHAT Yahoo IM successful chat join"; flow:from_server,established; content:"YMSG"; depth:4; nocase; content:"|00 98|"; depth:2; offset:10; classtype:policy-violation; sid:2458; rev:3;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 5050 (msg:"CHAT Yahoo IM conference offer invitation"; flow:to_server,established; content:"YMSG"; depth:4; nocase; content:"|00|P"; depth:2; offset:10; classtype:policy-violation; sid:2459; rev:4;)
alert tcp $HOME_NET any -> $EXTERNAL_NET 5100 (msg:"CHAT Yahoo IM conference request"; flow:to_server,established; content:"<R"; depth:2; pcre:"/^\x3c(REQIMG|RVWCFG)\x3e/ism"; classtype:policy-violation; sid:2460; rev:4;)
alert tcp $EXTERNAL_NET 5100 -> $HOME_NET any (msg:"CHAT Yahoo IM conference watch"; flow:from_server,established; content:"|0D 00 05 00|"; depth:4; classtype:policy-violation; sid:2461; rev:4;)
|