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Webshell SIGs
From: Peter Bates <peter.bates () ucl ac uk>
Date: Wed, 29 May 2013 13:06:11 +0100

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Hello all (second try with spaces inserted)

There are a variety of different SIGs to spot Webshells
- - primarily PHP.

One example is 22932 - "INDICATOR-COMPROMISE c99 shell.php command request - phpinfo"

I've put up a copy of C99 and made requests towards it
(primarily the rule above just hits on "act=php info")
but get nothing - but I do get consistent hits on
SID 1882 - id check returned userid.

URL logging (on the same box as Snort) shows the traffic:

2013-05-29 11:19:47     1.2.3.4  5.6.7.8   >       GET     www.x.x   /99.php?act=php info    
ELinks/0.12~pre5-2+squeeze1 (textmode; Debian; Linux 3.2.0-0.bpo.4-amd64 x86_64; 80x24-2)       http://www.x.x/99.php   
 HTTP/1.1

HOME_NET is correctly configured, EXTERNAL_NET is 'any'.

Snort is 2.9.3.1 (yes I need to upgrade)

Is there something obvious at fault?
I'm wondering if there's a whole bunch of incoming web evil I'm missing.

- -- 
Peter Bates
Senior Information Security Officer   Phone: +44(0)2076792049
Information Services Division         Internal Ext: 32049
University College London
London WC1E 6BT
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