Re: Quick rule optimize request

[James Lay <jlay () slave-tothe-box net>]

On 2012-07-17 12:27, JJ Cummings wrote:
> I would also add flow
>
> Sent from the iRoad
>
> On Jul 17, 2012, at 11:44, Joel Esler <jesler () sourcefire com [10]>
> wrote:
>
> > 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 [7]> 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 [1];
> > > 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


Thanks gents...appreciate the input.

James


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