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Network Security Snort-Signatures
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Re: [Snort-sigs] rule content

Subject: Re: [Snort-sigs] rule content
Date: Tue, 19 Jun 2007 12:20:57 +0100
On 19/06/07, Jules F. Pagna Disso <jferdinand@uacosendai.net> wrote:

1.       When to convert byte? Raw data? Or when to leave it as it is or
when to  have a mixed binary and text content ?

I would go for the easiest to read. If it's all ascii, go for plain
text. If you've got null bytes, backslashes or other stuff, might be
easier to keep it all as hex.

For example I have the rules

alert tcp any any -> any 80 (content: !"GET";)

alert tcp any any -> any 139 (content: "¦5C 00¦P¦00¦P¦00¦E¦00 5cl`;)

I think this would be: 5c 00 50 00 50 00 45 00 5c   (P being 0x50 and
E being 0x45). Someone please correct me if I'm wrong :)

I don't know NetBIOS well enough to say why this is a bad thing.

cheers,
 Jamie
-- 
Jamie Riden, CISSP / jamesr@europe.com / jamie@honeynet.org.uk
UK Honeynet Project: http://www.ukhoneynet.org/

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