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Re: [Emerging-Sigs] Rule assist
From: James Lay <jlay () slave-tothe-box net>
Date: Tue, 25 Jun 2013 11:22:18 -0600

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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