Re: Quick rule optimize request

[Joel Esler <jesler () sourcefire com>]

I see that your file_data needs to come before your content matches, and
also, the pattern you have specified as "fast_pattern" is by default the
fast_pattern (meaning you don't need to specifically call it out).

Joel

On Tue, Jul 17, 2012 at 12:07 PM, James Lay <jlay () slave-tothe-box net>wrote:

> Hey all,
>
> Here's the rule:
>
> alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any
> (msg:"INDICATOR-COMPROMISE possible WordPress head injection";
> content:"add_action"; content:"wp_head"; content:"check_wp_head_load";
> file_data; fast_pattern; classtype:bad-unknown; sid:10000015; reference:
> blog.unmaskparasites.com/2012/07/11/whats-in-your-wp-head; rev:1;)
>
> Chances are bad guys will change the function name, but other then that
> we'll see.  This should match:
>
> @add_action("wp_head", "check_wp_head_load", mt_rand(1, 6));
>
> But I don't have any packet caps to test this out on.  Anyone have any
> input on this?  Add some within entries perhaps?  Anyone have a pcap of
> this?  Thanks all.
>
> James
>
>
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-- 
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire

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Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

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