msg (message)
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+
The keyword msg gives contextual information about the signature and the possible alert.
The format of msg is::
rev (revision)
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+
The sid keyword is commonly accompanied by the rev keyword. Rev
represents the version of the signature. If a signature is modified,
the number of rev will be incremented by the signature writers. The
gid (group ID)
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+
The gid keyword can be used to give different groups of
signatures another id value (like in sid). Suricata by default uses gid 1.
It is possible to modify the default value. In most cases, it will be
classtype
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+
The classtype keyword gives information about the classification of
rules and alerts. It consists of a short name, a long name and a
priority. It can tell for example whether a rule is just informational
priority
--------
+
The priority keyword comes with a mandatory numeric value which can
range from 1 to 255. The values 1 through 4 are commonly used.
The highest priority is 1. Signatures with a higher priority will
target
------
+
The target keyword allows the rules writer to specify which side of the
alert is the target of the attack. If specified, the alert event is enhanced
to contain information about source and target.