File-identify category

[Peter Bates <peter.bates () ucl ac uk>]

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Hello all...

Okay, so I've read
http://vrt-blog.snort.org/2011/11/say-hello-to-file-identify-category.html

At the moment in the ruleset there are 235 rules, of which 159 seem to
be enabled.

I understand the purpose is to identify certain filetypes and then set
a flowbit on them which is being used in other rulesets
(exploit.rules, web-client.rules).

25 of the rules have 'noalert' set - I'm not particularly interested
in the actual download itself and I'm now seeing that SIDs

  18758 FILE-IDENTIFY Microsoft Windows Visual Basic script file
download request
    18983 FILE-IDENTIFY Apple Mach-O executable file magic detection
    15306 FILE-IDENTIFY Portable Executable binary file magic detection

are scoring pretty high in my alert logs.

Should I just be suppressing these unwanted alerts or is the intention
to add 'noalert' to more of the rules - or is the plan to have these
rules to use in logging *all* downloads of a particular type?

- -- 
Peter Bates
Senior Computer Security Officer    Phone: +44(0)2076792049
Information Services Division       Internal Ext: 32049
University College London
London WC1E 6BT
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