Re: Create rule to check illegal web access

[Kevin Ross <kevross33 () googlemail com>]

There is already specific sigs for torrent usage. Check under the p2p
categories of VRT and other rule provides and also .policy rules too.
Depends what you refer to as "illigal" though. There are few actual illigal
websites aside from the obvious one. If you are looking to detect that I
would be very careful and have to be very careful (i.e in full packet
capture is the image in a pcap format that could be carved off illigal
(probably yeah) etc. If you suspect that your first call would be the local
police station and let their forensic people deal with it from there and
advise you.

Regards,
Kevin

On 19 July 2012 13:15, Antonin <antonin () libfy com> wrote:

> Hi guys,
>
> I need to create a specific rule to detect illegal web usage.
> For example, I wan't to raise alert when users are going to websites with
> warez, cracks, serials, torrent, etc...
>
> Here is what I do:
> alert tcp $HOME_NET any -> any any (msg:"POLICY VIOLATION Illegal website
> Usage"; flow:to_server,established; content:"torrent"; nocase;
>  http_header; metadata:service http; classtype:policy-violation;
> sid:1234567894; rev:5;)
>
> But I need to create one rule per keyword. Not very optimal.
>
> Do you have any other idea? Tips?
>
> Many thanks
>
> Antonin
>
>
>
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