Re: [Snort-sigs] Slapper signature ??

[Ashley Thomas <athomas () cc gatech edu>]

Yeah, even i think that 0000 is incorrect.

Old ? I still see them on my network.. and the snort signature was not 
alerting..that's why i was wondering..
Thanks.

Jukka Juslin wrote:

> On Tue, 7 Jan 2003, Ashley Thomas wrote:
>
> ->Hi all,
> ->
> ->Snort signature for detecting slapper worm's communication messages is -
> ->
> ->alert udp $EXTERNAL_NET 2002 -> $HTTP_SERVERS 2002 (msg:"MISC slapper
> ->worm admin traffic";
> ->content:"|0000 4500 0045 0000 4000|"; offset:0; depth:10;
> ->classtype:trojan-activity;
> ->reference:url,www.cert.org/advisories/CA-2002-27.html;
> ->reference:url,isc.incidents.org/analysis.html?id=167; sid:1889; rev:3;)
> ->
> ->Should we be matching for content: "|0000 4500 0045 0000 4000|";
> ->or
> ->content: "|4500 0045 0000 4000|";
> ->
> ->I could not understand why the 0000 is there at the starting.
>
> I launched a test slapper attack and I was able detect it fine with
> content: "|4500 0045 0000 4000|". Therefore I think the 0000 is not
> needed.
>
> By the way, why are you so concerned with such an old attack? I think
> Microsoft SQL servers etc are much more targeted now (according to
> incidents.org). I am a bit concerned that I don't see much more new snort
> filters coming up for new vulnerabilities?
>
> Maybe I just have to write the filters I need by myself to accomplish what
> I want.
>
> Jukka Juslin
> M.Sc. (CS)
> European Organization for Nuclear Research
>
>  


--
Ashley Thomas
Research scientist
College of Computing
Georgia Tech.




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