[Snort-users] using ! in content

Martin Roesch roesch at ...421...
Tue Mar 6 13:43:10 EST 2001

Hi Steve,
     This feature is in the latest version of Snort in CVS.  Basically,
you use it like this:

alert tcp !$HOME_NET any -> $HOME_NET 21                            \
(flags: A+; content: "USER"; nocase; content: !"anonymous"; nocase; \
msg: "Non-anonymous login attempted to FTP server";)

Note the "!" before the "anonymous" in the second content check.  That's
how you use the content exception matching.


Steve Halligan wrote:
> I remember seeing something on this list, that I can't seem to find now,
> about using ! in the content field.  Is this true?  If so what is the
> syntax?  Can it be used in conjunction with a regular content entry in a
> this but not this kinda way?
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Martin Roesch
roesch at ...421...

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