Re: Oracle SQL Obfuscation Rule

[Joel Esler <jesler () sourcefire com>]

Thanks Nick,

I’ll ask someone to take a look.  

--
Joel Esler
AEGIS Intelligence Lead
OpenSource Community Manager
Vulnerability Research Team, Sourcefire

On Oct 22, 2013, at 5:59 PM, Nicholas Mavis <nmavis () sourcefire com> wrote:

> I noticed that in the ruleset, we currently have a rule looking for MS
> SQL obfuscation with a string of char()'s. However, we do not have a
> rule for the Oracle version, chr(). I've altered the original rule to
> the following:
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET $HTTP_PORTS
> (msg:"INDICATOR-OBFUSCATION large number of calls to chr function";
> flow:established,to_server; content:"GET"; http_method;
> content:"CHR("; nocase; http_uri;
> pcre:"/CHR\(.*?CHR\(.*?CHR\(.*?CHR\(.*?CHR\(/smiU"; metadata:service
> http; classtype:web-application-attack;)
>
> Thanks,
> Nick Mavis
>
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Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from 
the latest Intel processors and coprocessors. See abstracts and register >
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