Re: [Emerging-Sigs] Rule assist

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

On Jun 25, 2013, at 11:51 AM, Will Metcalf <wmetcalf () emergingthreatspro com> wrote:

> Just as an FYI all of my hits on these eventually lead to smoke loader and it's associated sigs firing.
>
> Regards,
>
> Will

Hey thanks Will…maybe I'll call it Initial Smoke Loader redirect or something more exciting than "Unknown".

James

> On Tue, Jun 25, 2013 at 12:22 PM, James Lay <jlay () slave-tothe-box net> wrote:
> On 2013-06-25 11:10, Joel Esler wrote:
> content:"GET /?1 HTTP/1.1"; fast_pattern:only;
>
> is your best bet.
>
> You could break it out like this if you want:
>
> urilen:3; content:"GET"; http_method; content:"/?1"; http_uri;
> content:"HTTP/1.1";
>
> "HTTP/1.1" isn't in a buffer, perhaps that's where you are getting the
> problem?
>
> --
> JOEL ESLER
>
> Senior Research Engineer, VRT
> OpenSource Community Manager
> Sourcefire
>
> Thanks Joel and Will...here's the full rule:
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"INDICATOR-COMPROMISED Unknown ?1 redirect"; 
> flow:to_server,established; content:"GET /?1 HTTP/1.1"; fast_pattern:only; metadata:policy balanced-ips drop, policy 
> security-ips drop, service http; classtype:bad-unknown; sid:10000082; rev:1;)
>
> Going to run this in production and see how it flies.
>
>
> James
>
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