Re: [Snort-users] WEB-CLIENT Excel malformed FBI record - False positive?

Is $EXTERNAL_NET set to 'any'?

On Mon, Jul 7, 2008 at 8:51 AM, Jesper Skou Jensen
<jesper.skou.jensen@uni-c.dk> wrote:
> Hi there,
>
> I've recently deployed a passive Snort sniffer next a bunch of
> webservers, and I'm getting quite a lot of "WEB-CLIENT Excel malformed
> FBI record" reports. I can't quite figure out if it's false positives or
> not.
>
> I've configured the IP's of the webservers as $HOME_NET, but when I look in
> "rules/web-client.rules"
>
> it states
> "alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any"
>
> which I read as the $HOME_NET is the destination, BUT when I read the
> Snort syslog message below, it looks like the "attack" originates from
> my webserver. Is that a correct assumption?
>
> (Timestamp and IPs have been changed to protect the innocent! :-)
> Jul  7 13:37:00 sysloghost snort: [1:12256:1] WEB-CLIENT Excel malformed
> FBI record [Classification: Attempted User Privilege Gain] [Priority:
> 1]: {TCP} 10.1.1.1:80 -> 10.2.2.2:1229
>
> 10.1.1.1 is the webserver
> 10.2.2.2 is some client
>
>
> Can any of you guys enlighten me?
>
>
> --
>
>   Jesper S. Jensen
> Basisnet og Sikkerhed
> Uni-C - Århus, Danmark
>
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