Snort mailing list archives
Re: Alert based on website URL
From: Feroz Basir <feroz.basir () gmail com>
Date: Tue, 21 Jan 2014 01:24:25 +0800
Hi All, Anyone could help me on my basic snort rule, please? I've tried a few combination and nothing worked for me. Thanks. Regards, Feroz Basir
On 14 Jan 2014, at 10:34, Feroz Basir <feroz.basir () gmail com> wrote: Hi Nicholas, I copy n paste the rule into local.rules file. I still couldn't see any alert when I accessed www.facebook.com. Can you help, please? Thanks again. Regards, Feroz BasirOn 14 Jan 2014, at 02:40, "Nicholas Mavis (nmavis)" <nmavis () cisco com> wrote: Yes, they would work if you altered the content matches correctly. The byte_test verifies that the packet is a valid DNS request and Host|3A| would be part of the HTTP headers. If you have further questions regarding those content matches, I would recommend reading into DNS and HTTP protocols along with their typical header structure.On 1/13/14 11:32 AM, "Feroz Basir" <feroz.basir () gmail com> wrote: Hi Nicholas, Thanks for replying. FYI, Facebook.com is just an example. Would that work with other URL as well? What is that - Host|3A| ? Care to teach me on how you got - byte_test:1,!&,0xF8,2; ? Thanks again. I have quite numbers of URL that I need to monitor and using different port number as well. Regards, Feroz BasirOn 14 Jan 2014, at 00:18, "Nicholas Mavis (nmavis)" <nmavis () cisco com> wrote: Feroz, The rules you have would not work for what you want to achieve. Here some some quick revisions to the rules you provided: alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"Facebook http"; content:"Host|3A| facebook.com"; fast_pattern: only;) alert udp $HOME_NET any -> any 53 (msg:"Facebook DNS"; byte_test:1,!&,0xF8,2; content:"|08|facebook|03|com|00|"; fast_pattern: only;) $HOME_NET is defined as your internal network you are monitoring and $EXTERNAL_NET is typically set to "any". $HTTP_PORTS is set to the Snort defaults in my configuration. -Nick MavisOn 1/12/14 1:04 PM, "Feroz Basir" <feroz.basir () gmail com> wrote: Hi All, I'm trying to monitor user/program accessing certain website on port 80 or different port. Would below rule work? Tried them but without any success. Perhaps i missed something. Alert tcp any any -> any 80 (MSG: "user/program accessing Facebook"; content: "www.facebook.com") Or based on DNS query. Alert udp any any -> any 53 (MSG: "user/program accessing Facebook"; content: "www.facebook.com") Thanks. Regards, Feroz Basir ------------------------------------------------------------------------ -- ---- CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.cl kt rk _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Alert based on website URL Feroz Basir (Jan 12)
- Re: Alert based on website URL Nicholas Mavis (nmavis) (Jan 13)
- Re: Alert based on website URL Feroz Basir (Jan 13)
- Re: Alert based on website URL Nicholas Mavis (nmavis) (Jan 13)
- Re: Alert based on website URL Feroz Basir (Jan 13)
- Re: Alert based on website URL Feroz Basir (Jan 20)
- Re: Alert based on website URL Joel Esler (jesler) (Jan 20)
- Re: Alert based on website URL Feroz Basir (Jan 21)
- Re: Alert based on website URL Feroz Basir (Jan 13)
- Re: Alert based on website URL Nicholas Mavis (nmavis) (Jan 13)