Re: Question regarding a rule

[Charlie Egan <chas5873 () gmail com>]

Thanks for that James, much appreciated, i'll have a good read!

Cheers for the help


On Thu, Jun 26, 2014 at 4:08 PM, James Lay <jlay () slave-tothe-box net> wrote:

> On 2014-06-26 08:27, Charlie Egan wrote:
> > Thats confusing to me James, since when I take a hex dump of the
> > .torrent file, this is my output;
> >
> > http://i60.tinypic.com/20usdpu.png [8]
> >
> > 38 64 61 are the first bytes that appear, and Ive checked the hex
> > dump
> > for multiple torrent files and it seems to be consistent for all of
> > them.
> >
> > Should I be putting the content section of the rule as |3864 61|
> > instead of |38 64 61| ? Unfortunately I cant access my machine with
> > Snort on at the moment, but will give it a try when I get a chance.
> >
> > Also could I ask how you got that output from the .pcap file?
> >
> > Sorry still new to all of this, I appreciate the responses!
> >
> > Cheers
>
> Charlie,
>
> First read this:
>
> https://en.wikipedia.org/wiki/Endianness
>
> With that knowledge, the new rule is:
>
> alert tcp any any -> any any (msg:"P2P torrent metafile download";
> content:"|64 38 3a 61|"; classtype:policy-violation; detection_filter:
> track by_dst, count 1, seconds 60; sid:1000001; rev:1;)
>
> Action Stats:
>       Alerts:            1 (  2.564%)
>       Logged:            1 (  2.564%)
>       Passed:            0 (  0.000%)
>
> lastly, check out the current torrent rules for Snort and Emerging
> Threats...that should help out a lot.
>
> James
>
>
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Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
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http://p.sf.net/sfu/Bonitasoft

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