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Re: [Snort-sigs] question on byte_jump

from [Brian] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] question on byte_jump
Date: Wed, 21 Feb 2007 15:56:11 -0500 
On Tue, Feb 20, 2007 at 03:17:45PM +0900, Dongwook Kim wrote:

I'm trying to write a rule using byte_jump option.

The situation I've encountered is something like below.

content:"|00000000|"; byte_jump:4,0,relative; byte_jump:4,0,relative,align;


Instead of words, how about an example?  

The following hex-dump would match:

    00 00 00 00 00 00 00 01 
    FF 00 00 00 01 FF FF FF 
    FF 00 01 02 03

the following set of rule options:

    content:"|00000000|"; 
    byte_jump:4,0,relative;
    byte_jump:4,0,relative,align; 
    content:"|0 01 02 03|"; within:4;

Brian

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