Keep in mind that rule 31108 is for http codes 2xx and 3xx. If you want to 
log that request with 4xx or 5xx codes you should add these rules (31101, 
31120...).

It's working, but I'm thinking on a better way to do this.

Regards.
Jesus Linares.


On Thursday, February 25, 2016 at 5:36:34 PM UTC+1, Jesus Linares wrote:
>
> That is because with GET parameters is not a simple query (rule 31108):
>
> **Phase 1: Completed pre-decoding.
>        full event: '10.10.10.10 hostname - [25/Feb/2016:10:10:10 -0500] 
> "GET /icons/whatever/?C=http://5.6.7.8/requeststringtest.php; HTTP/1.1" 
> 200 Text...'
>        hostname: 'LinMV'
>        program_name: '(null)'
>        log: '10.10.10.10 hostname - [25/Feb/2016:10:10:10 -0500] "GET 
> /icons/whatever/?C=http://5.6.7.8/requeststringtest.php; HTTP/1.1" 200 
> Text...'
>
>
> **Phase 2: Completed decoding.
>        decoder: 'web-accesslog'
>        srcip: '10.10.10.10'
>        url: '/icons/whatever/?C=http://5.6.7.8/requeststringtest.php;'
>        id: '200'
>
>
> **Rule debugging:
>     Trying rule: 4 - Generic template for all web rules.
>        *Rule 4 matched.
>        *Trying child rules.
>     Trying rule: 31100 - Access log messages grouped.
>        *Rule 31100 matched.
>        *Trying child rules.
>     
> *Trying rule: 31108 - Ignored URLs (simple queries).    Trying rule: 31511 
> - Blacklisted user agent (wget).*
>
>
> This is working:
>
>   <!--
>   10.10.10.10 hostname - [25/Feb/2016:10:10:10 -0500] "GET 
> //path/path2/requeststringtest.php; HTTP/1.1" 200 Text...
>   10.10.10.10 hostname - [25/Feb/2016:10:10:10 -0500] "GET 
> /icons/whatever/?C=http://5.6.7.8/requeststringtest.php; HTTP/1.1" 200 
> Text...
>   -->
>   <rule id="100060" level="5">
>     *<if_sid>31100,31108</if_sid>*
>     <match>requeststringtest.php</match>
>     <description>request string test 2</description>
>   </rule>
>
>
> Regards.
> Jesus Linares.
>
>
> On Thursday, February 25, 2016 at 5:11:48 PM UTC+1, James Culver wrote:
>>
>> Thanks. I have tested your version of the rule, and it works *so long as* 
>> there aren't GET parameters in the requested URI.
>>
>> For example, the following request triggers an alert:
>> 1.2.3.4 - -[25/Feb/2016:08:43:08 -0700] "GET 
>> /icons/whatever/requeststringtest.php HTTP/1.1" 20068393 blahblahblah
>>
>> However, this request is ignored:
>> 1.2.3.4 - -[25/Feb/2016:08:43:08 -0700] "GET /icons/whatever/?C=
>> http://5.6.7.8/requeststringtest.php HTTP/1.1" 20068393 blahblahblah
>>
>> Any ideas why that is?
>>
>

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