Re: Egobot

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

On 2013-10-15 10:05, Nick Randolph wrote:
> 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 cant tell if the 0x20 is present at the end of the
> user-agent string and it doesnt 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 youre looking for.
>
> On Tue, Oct 15, 2013 at 10:02 AM, James Lay <jlay () slave-tothe-box net
> [7]> 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
> > [1];
> > classtype:trojan-activity; sid:10000105; rev:1;)
> >
> > James

Ya good call Nick...I hosed it on the variables yet again...confirmed 
with:

http://www.symantec.com/connect/blogs/infostealernemim-how-pervasive-infostealer-continues-evolve

Bleh...thanks for the catch.

James

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