Re: Egobot

[Nick Randolph <drandolph () sourcefire com>]

Looking at the screenshot they used to show the outbound request it looks
like sid:19165 might catch this but, since they provided a screenshot I
can't tell if the 0x20 is present at the end of the user-agent string and
it doesn't look like they provided a hash either.

The %s indicates a string variable so the '/micro/advice.php' and the
'1irst' are probably not static. Something like
content:"arg1="; http_uri; content:"arg2="; distance:0; http_uri;
should catch what you're looking for.



On Tue, Oct 15, 2013 at 10:02 AM, James Lay <jlay () slave-tothe-box net>wrote:

> I may have missed something...it IS early in the AM after all ;)
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS
> (msg:"MALWARE-OTHER Win32.EgoBot CnC traffic"; ;
> flow:to_server,established;
> content:"|2f|micro|2f|advice.php|3f|arg1=1irst|26|arg2="; http_uri;
> fast_pattern:only; metadata:policy balanced-ips drop, policy
> security-ips drop, service http, ruleset community;
> reference:url,
> www.symantec.com/connect/blogs/backdooregobot-how-effectively-execute-targeted-campaign
> ;
> classtype:trojan-activity; sid:10000105; rev:1;)
>
> James
>
>
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-- 

Nick Randolph
Research Engineer
Sourcefire, Inc.
nrandolph () sourcefire com
Sourcefire.com <http://www.sourcefire.com/>

------------------------------------------------------------------------------
October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from 
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60135031&iu=/4140/ostg.clktrk

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