Andrés,
Practice mames perfect, but at first sight I suggest to look at the
last dot in the example, that won't be on IP addresses.
Also, looking at protocols before the IP or hostname might help. E.g.
http:// or ftp://...

For http, looking at the expected characters after the IP or hostname
may also help, such as / or ; (URL cookies) or ? (get arguments), etc.

Perhaps the best option would be to provide as output a more trusted
list of IP and hostnames, and an extended list that would potentially
include false possitives, not to miss anything.

Cheers,
--
Raul Siles

On Thursday, March 17, 2011, Andres Riancho <andres.rian...@gmail.com> wrote:
> Taras,
>
> On Tue, Mar 15, 2011 at 7:14 PM, Taras <ox...@oxdef.info> wrote:
>> Hi, all!
>>
>> What do you think about making some kind of port of host-extract tool
>> described below in w3af? It can be a grep plugin. We already have
>> privateIP grep plugin but it is useful in some cases to extract also
>> hosts/IPs which are different than target (not only private IPs).
>
>     Sounds like a good idea if we can reduce the false positives ! Any
> techniques you can think of for reducing them?
>
> Regards,
>
>>
>> -------- Forwarded Message --------
>> From: YGN Ethical Hacker Group <li...@yehg.net>
>> To: full-disclosure <full-disclos...@lists.grok.org.uk>,
>> websecur...@webappsec.org
>> Subject: [WEB SECURITY] [new tool announcement] host-extract
>> Date: Mon, 14 Mar 2011 00:46:18 +0800
>>
>> Host-Extract | Host/IP Pattern Extractor
>> ===============================
>>
>> category: /pentest/enumeration/www
>> useful area: blackbox testing
>>
>>
>> This little ruby script tries to extract all IP/Host patterns in page
>> response of a given URL and JavaScript/CSS files of that URL.
>>
>> With it, you can quickly identify internal IPs/Hostnames, development
>> IPs/ports, cdn, load balancers, additional attack entries related to
>> your target that are revealed in inline js, css, html comment areas
>> and js/css files.
>>
>> This is unlike web crawler which looks for new links only in anchor
>> tags (<a) or the like.
>>
>> In some cases, host-extract may give you false positives when there
>> are some words like - main-site_ver_10.2.1.3.swf.
>>
>> With -v option, you can ask the tool to output html view-source
>> snippets for each IP/Domain extracted. This will shorten your manual
>> analysis time.
>>
>> Please go to http://host-extract.googlecode.com/ for more info.
>>
>>
>> Download/Update
>> ==============
>> svn co http://host-extract.googlecode.com/svn/trunk/ host-extract
>>
>>
>> Tutorial Wiki
>> ==========
>>
>> Sebastien Damaye from aldeid.com has prepared a thorough host-extract
>> tutorial with real-world famous web sites.
>>
>> http://aldeid.com/index.php/Host-extract
>>
>>
>>
>> --
>> Taras
>> http://oxdef.info
>> ----
>> "Software is like sex: it's better when it's free." - Linus Torvalds
>>
>>
>>
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>
>
>
> --
> Andrés Riancho
> Director of Web Security at Rapid7 LLC
> Founder at Bonsai Information Security
> Project Leader at w3af
>
> ------------------------------------------------------------------------------
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-- 
--
Raul Siles - www.raulsiles.com
Founder & Senior Security Analyst
Taddong (www.taddong.com)

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