full-disclosure - Re: Random HTTP-Requests

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Date: Tue, 31 Mar 2009 17:37:37 +0200
From: "Jan G.B." <ro0ot.w00t@...glemail.com>
To: Andres Riancho <andres.riancho@...il.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Random HTTP-Requests

Hi Andres,
thanks for your Ideas.

2009/3/31 Andres Riancho <andres.riancho@...il.com>:
> Jan,
>
> On Tue, Mar 31, 2009 at 11:30 AM, Jan G.B. <ro0ot.w00t@...glemail.com> wrote:
>> Hi there,
>>
>> I've noticed that some weird requests are showing up in the error logs
>> of one of my apache webservers.
>> The requests seem to have the following in common:
>>
>> * GET Request on some random alphanumeric string like "GET /hDMe9NS"
>
> w3af [0] uses these types of requests to identify the 404 response of
> a web application. Maybe its somebody using w3af to scan your website?
> Are you seeing a lot of requests coming from the same IP address after
> the "random" request?

nope, at least not always:



Looking up the corresponding request in the access log was a good idea..

Here's one example:
221.204.*.* - - [30/Mar/2009:10:21:30 +0200] "GET
/mtERuE0/osOAJo/3dK/tUekE2Ws.gif HTTP/1.1" 404 293 "-" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1)"

and another one (with referer)

124.236.*.* - - [31/Mar/2009:17:01:59 +0200] "GET
/XePDcSx/BabcSF/4GabcNO0/ncabc/abcf/Babcf-XS/abc/abcFEl/gSabcUs-z/UlabcbF/gib_.gif
HTTP/1.1" 404 362
"http://www.labcdl.com/B2abcBfV-j/zabcZ/33z/NBxab2H6/Bvgzabc/NEabc/20Xab4/lxJabc4x/HnabcE/BabcZU/ezBf/nnx/xUBabcX/0S4Z-SnzG.html"
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"


Grepping these IPs in access log shows up
www:/var/log/apache2# grep "124.236.*.*" access.log|wc -l
12
www:/var/log/apache2# grep "221.204.*.*" access.log|wc -l
1

All these requests are totally random and ending in with .gif. UA is
always the evil IE6. What sane developer would use such a UA? ;)



>
>> * Referer has some randomized, invalid URL like
>> http://www.kSJn32.com/ckJMSC/kSMSR/mndm/sads.html
>
> w3af [0] doesn't perform requests with invalid referers; at least not
> in the original version. Someone could have modified it to behave like
> this.
>

Why would someone want to do this? It makes no sense for me.





>> Every domain that showed up wasn't registered - no DNS reply or whatsoever.
>>
>>
>> Here's an example out of my Log file ( I slightly modified the random
>> strings - just in case ;))
>>
>> [Tue Mar 30 10:12:41 2009] [error] [client 124.236.*.*] File does not
>> exist: /var/www/foo.bar/web/hFBeX7EK, referer:
>> http://www.ruyidqpg.com/SJQubgQP/QenlI/_n2Pn/_px/Uph/wSBf_l/leJB/C8Y00EIPfD07U/AO8lnzhgAl/SD70gA8Jg/nfA013J/ZOWAgYCZ/DOf7hg.html
>
> How does the corresponding entry in the access.log file look like? It
> should show you some user agent... To find this just:
>
> grep hFBeX7EK access.log
>
>> The amount of random directories isn't constant.
>>
>> Any Ideas what is causing these requests? Is it a well known worm?
>> What could it be.. what for..?
>> The Server is Running Apache with PHP, the main application is made
>> with the symfony framework.
>>
>> Thanks, Regards
>>
>>
>>
>> PS: You believe this doesn't belong into this mailing list? Sorry, I'm
>> not interested - keep it to yourself.
>>
>> _______________________________________________
>> Full-Disclosure - We believe in it.
>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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>>
>
>
> [0] http://w3af.sf.net/
>
> Cheers,
> --
> Andrés Riancho
> http://www.bonsai-sec.com/
> http://w3af.sourceforge.net/
>

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