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Re: [Emerging-Sigs] Unusually small php puts
From: Joel Esler <jesler () sourcefire com>
Date: Mon, 10 Jun 2013 08:25:24 -0400


I ran this in our test systems for a couple weeks, and while it did alert, it didn't alert on anything that wasn't 
benign traffic.

Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager

On May 16, 2013, at 2:37 PM, Joel Esler <jesler () sourcefire com> wrote:

I'm going to test it in our test systems James, we'll see how it goes.

On May 15, 2013, at 1:08 PM, James Lay <jlay () slave-tothe-box net> wrote:

Last month (the 19th I think) I attending an all day security conference...it was pretty good.  One of the tell tale 
signs of C2 traffic was small php PUT's (according to one presenter), so here's a sig for that:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"POLICY Unusually small php PUT"; 
flow:to_server,established; content:"PUT"; http_method; http_uri; urilen:<10; classtype:misc-activity; sid:10000059; 

Might be useful, might not.  I'm embarrassed that it took me almost a month to get to my notes 8-|

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