Re: Rule Making Question

[Alex Tatistcheff via Snort-sigs <snort-sigs () lists snort org>]

Every keyword in a Snort rule has to be true for the rule to fire.  If a
single content, pcre, byte_test, etc. doesn't evaluate to TRUE then the
whole rule doesn't match the packet.  No, you can't change that behavior.

Alex Tatistcheff
alext () pobox com

Amazon Author Page <https://www.amazon.com/author/alext>


On Tue, Oct 12, 2021 at 8:55 AM EGD via Snort-sigs <
snort-sigs () lists snort org> wrote:

> I am new to rule writing and wanted to know when using multiple "content"
> tags and "pcre" tags if they are conditional. In other words, do they
> trigger if all of them get found true or if at least one does.
>
> i.e. content: "username"; content: "| 4c 55 6d|"; pcre "^[wW]hat[
> .-]?[eE]ver$"
>
> would the rule trigger is only one of the above examples is true or if all
> - bonus question, could I make it conditional within the rule?
>
>
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