--- /dev/null
+<!-- @(#) $Id: ./etc/rules/squid_rules.xml, 2011/09/08 dcid Exp $
+
+ - Official Squid rules for OSSEC.
+ -
+ - Copyright (C) 2009 Trend Micro Inc.
+ - All rights reserved.
+ -
+ - This program is a free software; you can redistribute it
+ - and/or modify it under the terms of the GNU General Public
+ - License (version 2) as published by the FSF - Free Software
+ - Foundation.
+ -
+ - License details: http://www.ossec.net/en/licensing.html
+ -
+ - Contributed by: Ahmet Ozturk
+ -->
+
+
+<!-- More information about squid codes below:
+ - http://www.uniar.ukrnet.net/tools/Squid-FAQ/FAQ-6.html
+ -->
+
+
+<!-- Squid frequency -->
+<var name="SQUID_FREQ">8</var>
+
+
+<group name="squid,">
+ <rule id="35000" level="0">
+ <category>squid</category>
+ <description>Squid messages grouped.</description>
+ </rule>
+
+ <!-- Pre-rule with all the 400 error codes.
+ - This will make searching faster for most
+ - of the traffic.
+ -->
+
+ <rule id="35002" level="4">
+ <if_sid>35000</if_sid>
+ <id>^4|^5|^6</id>
+ <description>Squid generic error codes.</description>
+ </rule>
+
+ <rule id="35003" level="5">
+ <if_sid>35002</if_sid>
+ <id>^400</id>
+ <description>Bad request/Invalid syntax.</description>
+ </rule>
+
+ <rule id="35004" level="5">
+ <if_sid>35002</if_sid>
+ <id>^401</id>
+ <description>Unauthorized: Failed attempt to access </description>
+ <description>authorization-required file or directory.</description>
+ </rule>
+
+ <rule id="35005" level="5">
+ <if_sid>35002</if_sid>
+ <id>^403</id>
+ <description>Forbidden: Attempt to access forbidden file </description>
+ <description>or directory.</description>
+ </rule>
+
+ <rule id="35006" level="5">
+ <if_sid>35002</if_sid>
+ <id>^404</id>
+ <description>Not Found: Attempt to access non-existent </description>
+ <description>file or directory.</description>
+ </rule>
+
+ <rule id="35007" level="5">
+ <if_sid>35002</if_sid>
+ <id>^407</id>
+ <description>Proxy Authentication Required: User is not </description>
+ <description>authorized to use proxy.</description>
+ </rule>
+
+ <rule id="35008" level="5">
+ <if_sid>35002</if_sid>
+ <id>^4</id>
+ <description>Squid 400 error code (request failed).</description>
+ </rule>
+
+ <rule id="35009" level="5">
+ <if_sid>35002</if_sid>
+ <id>^5|^6</id>
+ <description>Squid 500/600 error code (server error).</description>
+ </rule>
+
+ <rule id="35010" level="4">
+ <if_sid>35009</if_sid>
+ <id>^503</id>
+ <description>Squid 503 error code (server unavailable).</description>
+ </rule>
+
+ <!-- Special rules for 403/404 errors -->
+ <rule id="35021" level="6">
+ <if_sid>35006</if_sid>
+ <url>blst.php|xxx3.php|ngr7.php|ngr2.php|/nul.php$|/mul.php$|/444.php</url>
+ <description>Attempt to access a Beagle worm (or variant) </description>
+ <description>file.</description>
+ <info type="link">http://www.symantec.com/avcenter/venc/data/w32.beagle.dp.html</info>
+ <info type="text">W32.Beagle.DP is a Worm that drops Trojan.Lodear and opens a back door on the compromised computer.</info>
+ <group>automatic_attack,</group>
+ </rule>
+
+ <!-- Other worms -->
+ <rule id="35022" level="6">
+ <if_sid>35006</if_sid>
+ <url>/jk/exp.wmf$|/PopupSh.ocx$</url>
+ <description>Attempt to access a worm/trojan related site.</description>
+ <group>automatic_attack,</group>
+ </rule>
+
+ <!-- Ignoring google earth, ms web site access and some other
+ - common extensions to cause false positives (specially anti virus).
+ - It includes most of the time bugs on IE that always
+ - access these pages (causing 403/404 errors).
+ -->
+ <rule id="35023" level="0">
+ <if_sid>35004, 35005, 35006, 35009</if_sid>
+ <url>.jpg|.gif|favicon.ico$|.png$|.swf|.txt$|.zip|.css|.xml|.js|.bmp$|</url>
+ <url>windowsupdate/redir/wuredir.cab|</url>
+ <url>^http://codecs.microsoft.com/isapi/ocget.dll|</url>
+ <url>^http://activex.microsoft.com/objects/ocget.dll|</url>
+ <url>^http://webmessenger.msn.com/session/null|</url>
+ <url>^http://sqm.msn.com/sqm/wmp/sqmserver.dll|</url>
+ <url>^http://config.messenger.msn.com/Config/MsgrConfig.asmx|</url>
+ <url>kaspersky-labs.com/|</url>
+ <url>^http://liveupdate.symantecliveupdate.com/|</url>
+ <url>_vti_bin/owssvr.dll|MSOffice/cltreq.asp|</url>
+ <url>google.com/mt?|</url>
+ <url>google.com/kh?|</url>
+ <url>^http://kh.google.com/flatfile</url>
+
+ <!-- Add more extensions to be ignored in here.
+ <url>|.html$|.htm</url>
+ -->
+
+ <description>Ignored files on a 40x error.</description>
+ </rule>
+
+ <!-- Context relevant rules (correlated) -->
+ <rule id="35051" level="10" frequency="$SQUID_FREQ" timeframe="120">
+ <if_matched_sid>35005</if_matched_sid>
+ <same_source_ip />
+ <different_url />
+ <description>Multiple attempts to access forbidden file </description>
+ <description>or directory from same source ip.</description>
+ </rule>
+
+ <rule id="35052" level="10" frequency="$SQUID_FREQ" timeframe="120">
+ <if_matched_sid>35007</if_matched_sid>
+ <same_source_ip />
+ <description>Multiple unauthorized attempts to use proxy.</description>
+ </rule>
+
+ <rule id="35053" level="10" frequency="$SQUID_FREQ" timeframe="120">
+ <if_matched_sid>35003</if_matched_sid>
+ <same_source_ip />
+ <different_url />
+ <description>Multiple Bad requests/Invalid syntax.</description>
+ </rule>
+
+ <rule id="35054" level="12" frequency="$SQUID_FREQ" timeframe="240">
+ <if_matched_sid>35021</if_matched_sid>
+ <same_source_ip />
+ <description>Infected machine with W32.Beagle.DP.</description>
+ <info type="link">http://www.symantec.com/avcenter/venc/data/w32.beagle.dp.html</info>
+ <info type="text">W32.Beagle.DP is a Worm that drops Trojan.Lodear and opens a back door on the compromised computer.</info>
+ </rule>
+
+ <rule id="35055" level="10" frequency="$SQUID_FREQ" timeframe="90">
+ <if_matched_sid>35006</if_matched_sid>
+ <same_source_ip />
+ <different_url />
+ <description>Multiple attempts to access a non-existent file.</description>
+ </rule>
+
+ <rule id="35056" level="12" frequency="$SQUID_FREQ" timeframe="240">
+ <if_matched_sid>35022</if_matched_sid>
+ <same_source_ip />
+ <description>Multiple attempts to access a worm/trojan/virus </description>
+ <description>related web site. System probably infected.</description>
+ </rule>
+
+ <rule id="35057" level="10" frequency="$SQUID_FREQ" timeframe="240">
+ <if_matched_sid>35008</if_matched_sid>
+ <same_source_ip />
+ <different_url />
+ <description>Multiple 400 error codes (requests failed).</description>
+ </rule>
+
+ <rule id="35058" level="10" frequency="$SQUID_FREQ" timeframe="240">
+ <if_matched_sid>35009</if_matched_sid>
+ <same_source_ip />
+ <different_url />
+ <description>Multiple 500/600 error codes (server error).</description>
+ </rule>
+
+ <rule id="35095" level="0" frequency="2" timeframe="360">
+ <if_matched_sid>35055</if_matched_sid>
+ <same_source_ip />
+ <description>Ignoring multiple attempts from same source ip</description>
+ <description> (alert only once).</description>
+ </rule>
+
+</group> <!-- ACCESSLOG,SQUID -->
+
+<!-- EOF -->
+
projects / ossec-hids.git / blobdiff