Snort mailing list archives
Re: help writing snort rule
From: Blake Hartstein <bhartstein () demarc com>
Date: Fri, 26 Jan 2007 11:48:00 -0800
Bill Lopez wrote:
which doesn’t produce an alert either – eventually I want to apply this filter to just traffic from/to mail , telnet, ftp (etc) servers – I can send any variance of xxx-xx-xxxx, xxxxxxxx or xxx xx xxxx via an e-mail, text file attachment or file upload and still never see an alert to the console. I have a simple rule to check for content using a keyword and get alerted when sending that keyword with e-mail, attachment and file upload (this was my test to see if snort was actually alerting correctly) I am only running my test rules with an out of the box snort.conf file.Why wouldn’t either of the above rules alert with (for example) an e-mail sent with 555-55-5555 in the body?
Bill,Can you please paste how you are running snort on the command line, and if you changed anything in your snort.conf please post that information too.
This type of traffic should be seen by snort and the rules you created should alert.
Perhaps, snort isn't seeing the traffic you are expecting, try running # snort -vde -i eth0 to see what snort sees. or if you are running from a pcap you might need to use config checksum_mode: none If you captured the file from the localhost. Also, which port is this traffic intended for?You might need to configure your flow_depth on http_inspect if you are seeing this deep within the packet, rather than just in the headers.
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Current thread:
- help writing snort rule Bill Lopez (Jan 25)
- Re: help writing snort rule Nerijus Krukauskas (Jan 25)
- Re: help writing snort rule Matt Jonkman (Jan 26)
- Re: help writing snort rule Joel Esler (Jan 26)
- <Possible follow-ups>
- Re: help writing snort rule Bill Lopez (Jan 26)
- Re: help writing snort rule Joel Esler (Jan 26)
- Re: help writing snort rule Blake Hartstein (Jan 26)
- Re: help writing snort rule Bill Lopez (Jan 26)