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Re: Building a host attribute table?
From: "Crook, Parker" <Parker_Crook () reyrey com>
Date: Wed, 13 Oct 2010 10:36:22 -0400

From: Andy Berryman [mailto:aberryman () Cymtec com]
Sent: Wednesday, October 13, 2010 10:00 AM
To: snort-users () lists sourceforge net
Subject: [Snort-users] Building a host attribute table?

Is it worth building a host attribute table when you only have the operating system? Basically, is it worth the hassle? 
Let's say I only have the OS for about 100 machines on 3 class B subnets. Most of them are Windows XP, 2k8 or win7 
boxes. There are about 20-30 that are SunOS, linux, or DRAC.

If all you are using the HAT for is to define OS, then it's probably easier to setup a new stream5, and frag3 policy 
and define the IPs there.

My stream5 is setup like this.

preprocessor stream5_global: max_tcp 1048576, memcap 1073741824, track_tcp yes, track_udp no
preprocessor stream5_tcp: policy windows, use_static_footprint_sizes, dont_store_large_packets, ports client 21 22 23 
25 42 53 79 80 109 110 111 113 119 135 136 137 139 143 110 111 161 445 513 514 691 1433 1521 2100 2301 3128 3306 6665 
6666 6667 6668 6669 7000 8000 8080 8180 8888 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779, ports both 
443 465 563 636 989 992 993 994 995 7801 7702 7900 7901 7902 7903 7904 7905 7906 6907 7908 7909 7910 7911 7912 7913 
7914 7915 7916 7917 7918 7919 7920

So with that said, it seems like it'd be pointless to set it up for anything that's a Windows machine, right?

Depends on if you're going to use the HAT to also define ports, services, applications... if you are running services 
on non-standard ports, I say by all means, add in the Windows boxes so that you get coverage via the metadata service 
tags in rules, otherwise you're going to be missing a bit of data. (bit is relative here, in my environment, I would 
miss a lot).

Thanks,
Andy Berryman
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