Re: rule?

[Joel Esler <jesler () sourcefire com>]

Can you send me the pcap off list and I can take a look?

On Aug 13, 2013, at 6:08 PM, Frank Calone <fc10011001 () gmail com> wrote:

> Some lessons are learned the hard way!  I added the -k none and -P 65535.  This did not change the end result though. 
>  I am still getting the stats to show no alerts.
>  
> Frank
>
> On Tue, Aug 13, 2013 at 5:53 PM, Joel Esler <jesler () sourcefire com> wrote:
> Dear Frank,
>
> First things first, try checking this out:
> https://github.com/vrtadmin/snort-faq/blob/master/FAQ/Im-not-receiving-alerts-in-Snort.md
>
> --
> Joel Esler
> Senior Research Engineer, VRT
> OpenSource Community Manager
> Sourcefire
>
> On Aug 13, 2013, at 5:18 PM, Frank Calone <fc10011001 () gmail com> wrote:
>
> > I’m trying to alert when I find this pattern within say the first 15 bytes of the file data of an http session.  My 
> > rule is not working and I don’t know why.  I have a pcap file and am playing it back as follows:
> > snort –dvr  file1.pcap –c /etc/snort/snort.conf
> >  
> > The stats at the end show zero alerts. 
> >  
> > Here is my rule:
> >  
> >  alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"pcap file hit"; flow:to_client,established; 
> > content:"Content-Type: text/html"; http_header; content:"|0d 0a|"; http_header; file_data; content:"|1f 2f|"; 
> > depth:15; flowbits:set,tagged; tag:session,0,packets,1000,seconds; sid:3889999; rev:0;)
> >  
> > so, I am looking for hex “1f 2f” within the first 15 bytes of the file data of the http session.
> >  
> > The pcap data has the following info:
> > 64 69 6E 67 3A 20 63 68 75 6E 6B 65 64 0D 0A 43  ding: chunked..C
> > 6F 6E 74 65 6E 74 2D 54 79 70 65 3A 20 74 65 78  ontent-Type: tex
> > 74 2F 68 74 6D 6C 0D 0A 0D 0A 52 50 30 30 1F 2F  t/html....RP00./
> > 18 56 61 88 18 1B 18 20 20 1C 20 18 18 E7 E7 18  .Va.............
> >  
> > Frank
> > ------------------------------------------------------------------------------
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