Hi all,
In web_rules.xml rule is triggering alert that are stored in the log , but
not reaching our email notication , any idea.
here the file:
--------------------
<group name="web,accesslog,">
<rule id="31100" level="5">
<category>web-log</category>
<description>Access log messages grouped.</description>
</rule>
<rule id="31108" level="5">
<if_sid>31100</if_sid>
<id>^2|^3</id>
<compiled_rule>is_simple_http_request</compiled_rule>
<description>Ignored URLs (simple queries).</description>
</rule>
<rule id="31101" level="5">
<if_sid>31100</if_sid>
<id>^4</id>
<description>Web server 400 error code.</description>
</rule>
<rule id="31102" level="5">
<if_sid>31101</if_sid>
<url>.jpg$|.gif$|favicon.ico$|.png$|robots.txt$|.css$|.js$</url>
<compiled_rule>is_simple_http_request</compiled_rule>
<description>Ignored extensions on 400 error codes.</description>
</rule>
<rule id="31103" level="6">
<if_sid>31100</if_sid>
<url>='|select%20|select+|insert%20|%20from%20|%20where%20|union%20|</url>
<url>union+|where+|null,null|xp_cmdshell</url>
<description>SQL injection attempt.</description>
<group>attack,sql_injection,</group>
</rule>
<rule id="31104" level="6">
<if_sid>31100</if_sid>
<!-- Attempt to do directory transversal, simple sql injections,
- or access to the etc or bin directory (unix). -->
<url>%027|%00|%01|%7f|%2E%2E|%0A|%0D|../..|..\..|echo;|..|</url>
<url>cmd.exe|root.exe|_mem_bin|msadc|/winnt/|</url>
<url>/x90/|default.ida|/sumthin|nsiislog.dll|chmod%|wget%|cd%20|</url>
<url>cat%20|exec%20|rm%20</url>
<description>Common web attack.</description>
<group>attack,</group>
</rule>
<rule id="31105" level="6">
<if_sid>31100</if_sid>
<url>%3Cscript|%3C%2Fscript|script>|script%3E|SRC=javascript|IMG%20|</url>
<url>%20ONLOAD=|INPUT%20|iframe%20</url>
<description>XSS (Cross Site Scripting) attempt.</description>
<group>attack,</group>
</rule>
<rule id="31106" level="6">
<if_sid>31103, 31104, 31105</if_sid>
<id>^200</id>
<description>A web attack returned code 200 (success).</description>
<group>attack,</group>
</rule>
<rule id="31110" level="6">
<if_sid>31100</if_sid>
<url>?-d|?-s|?-a|?-b|?-w</url>
<description>PHP CGI-bin vulnerability attempt.</description>
<group>attack,</group>
</rule>
<rule id="31109" level="6">
<if_sid>31100</if_sid>
<url>+as+varchar(8000)</url>
<regex>%2Bchar\(\d+\)%2Bchar\(\d+\)%2Bchar\(\d+\)%2Bchar\(\d+\)%2Bchar\(\d+\)%2Bchar\(\d+\)</regex>
<description>MSSQL Injection attempt (/ur.php, urchin.js)</description>
<group>attack,</group>
</rule>
<!-- If your site have a search engine, you may need to ignore
- it in here.
-->
<rule id="31107" level="0">
<if_sid>31103, 31104, 31105</if_sid>
<url>^/search.php?search=|^/index.php?searchword=</url>
<description>Ignored URLs for the web attacks</description>
</rule>
<rule id="31115" level="13" maxsize="5900">
<if_sid>31100</if_sid>
<description>URL too long. Higher than allowed on most </description>
<description>browsers. Possible attack.</description>
<group>invalid_access,</group>
</rule>
<!-- 500 error codes, server error
- http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
-->
<rule id="31120" level="5">
<if_sid>31100</if_sid>
<id>^50</id>
<description>Web server 500 error code (server error).</description>
</rule>
<rule id="31121" level="4">
<if_sid>31120</if_sid>
<id>^501</id>
<description>Web server 501 error code (Not Implemented).</description>
</rule>
<rule id="31122" level="5">
<if_sid>31120</if_sid>
<id>^500</id>
<options>alert_by_email</options>
<description>Web server 500 error code (Internal Error).</description>
<group>system_error,</group>
</rule>
<rule id="31123" level="4">
<if_sid>31120</if_sid>
<id>^503</id>
<options>alert_by_email</options>
<description>Web server 503 error code (Service
unavailable).</description>
</rule>
<!-- Rules to ignore crawlers -->
<rule id="31140" level="0">
<if_sid>31101</if_sid>
<compiled_rule>is_valid_crawler</compiled_rule>
<description>Ignoring google/msn/yahoo bots.</description>
</rule>
<rule id="31151" level="10" frequency="10" timeframe="120">
<if_matched_sid>31101</if_matched_sid>
<same_source_ip />
<description>Multiple web server 400 error codes </description>
<description>from same source ip.</description>
<group>web_scan,recon,</group>
</rule>
<rule id="31152" level="10" frequency="6" timeframe="120">
<if_matched_sid>31103</if_matched_sid>
<same_source_ip />
<description>Multiple SQL injection attempts from same </description>
<description>souce ip.</description>
<group>attack,sql_injection,</group>
</rule>
<rule id="31153" level="10" frequency="8" timeframe="120">
<if_matched_sid>31104</if_matched_sid>
<same_source_ip />
<description>Multiple common web attacks from same souce
ip.</description>
<group>attack,</group>
</rule>
<rule id="31154" level="10" frequency="8" timeframe="120">
<if_matched_sid>31105</if_matched_sid>
<same_source_ip />
<description>Multiple XSS (Cross Site Scripting) attempts </description>
<description>from same souce ip.</description>
<group>attack,</group>
</rule>
<rule id="31161" level="10" frequency="8" timeframe="120">
<if_matched_sid>31121</if_matched_sid>
<same_source_ip />
<description>Multiple web server 501 error code (Not
Implemented).</description>
<group>web_scan,recon,</group>
</rule>
<rule id="31162" level="10" frequency="5" timeframe="120">
<if_matched_sid>31122</if_matched_sid>
<same_source_ip />
<description>Multiple web server 500 error code (Internal
Error).</description>
<group>system_error,</group>
</rule>
<rule id="31163" level="10" frequency="8" timeframe="120">
<if_matched_sid>31123</if_matched_sid>
<same_source_ip />
<description>Multiple web server 503 error code (Service
unavailable).</description>
<group>web_scan,recon,</group>
</rule>
</group> <!-- Web access log -->
log:
====
====================================================
root@ossec-server:/var/ossec/logs/alerts# tail -f alerts.log
Rule: 31101 (level 5) -> 'Web server 400 error code.'
Src IP: 10.91.27.83
10.91.27.83 - - [18/Dec/2012:02:17:50 +0530] "GET /_hostmanager/healthcheck
HTTP/1.1" 404 543 "-" "ELB-HealthChecker/1.0"
** Alert 1355777301.244484: - web,accesslog,
2012 Dec 18 02:18:21 ossec-server->/var/log/apache2/access.log
Rule: 31101 (level 5) -> 'Web server 400 error code.'
Src IP: 10.91.27.83
10.91.27.83 - - [18/Dec/2012:02:18:20 +0530] "GET /_hostmanager/healthcheck
HTTP/1.1" 404 543 "-" "ELB-HealthChecker/1.0"
** Alert 1355777331.244789: - web,accesslog,
2012 Dec 18 02:18:51 ossec-server->/var/log/apache2/access.log
Rule: 31101 (level 5) -> 'Web server 400 error code.'
Src IP: 10.91.27.83
10.91.27.83 - - [18/Dec/2012:02:18:50 +0530] "GET /_hostmanager/healthcheck
HTTP/1.1" 404 543 "-" "ELB-HealthChecker/1.0"
