12/24/2023 0 Comments Splunk rex multiple vlaues![]() ![]() the value assigned to TOKENIZER is the regular expression to select a single instance of the field, here including characters up to an open parenthesis, a plus sign, or a close parenthesis.the stanza name in square brackets is the name of the field to affect, here the “to” field,.Create a conf in Splunk_TA_checkpoint-opseclea\local (or you can put it in your own app that depends on the LEA add-on).The regular expression to use in the file will be the same one we presented in the makemv example above, so you can test it out with makemv before putting it in nf. This is done with the TOKENIZER parameter in nf.Īccording to the documentation for the nf configuration file: It’s probably best not to change the core extraction of the LEA add-on (though we could), but we can use another technique to parse the individual values of the to field after the full field has been extracted by the add-on. Or using rex to extract the values back into the field,īut it would be preferable if this was done automatically by Splunk so we don’t have to include one of these functions in every search involving to. We can, of course, do this at search time in SPL, using either makemv, We would prefer that each of the addresses was broken out as a separate value in a multi-value to field. Those (+) characters are actually delimiters between multiple e-mail addresses. In the case of the to field, an example of a resulting extracted value (+) (+) is valid but not as helpful as it could be. The fields are delimited by pipe characters with a key=value structure within the delimiters and the LEA add-on extracts these fields using a simple regex in default/nf: We can fix this, at search time, using the TOKENIZER.Ī typical malware event from Check Point looks like this: The Splunk Add-on for Check Point OPSEC LEA (the “LEA add-on”) parses the to field as a single value encompassing all of the addresses, making it hard to report on a specific address. Splunk deals with these values by allowing fields to hold multiple values, which it refers to as simply a “multivalue field.” One place you see this in Check Point logs is in malware events, which sometimes report e-mail anomalies and include a to field. One common field type that often has multiple values is an e-mail address field, such as from or to. ![]() But there are occasionally fields which have more than one value. For instance, in a firewall packet event there is a src_ip, src_port, dest_ip, dest_port, action, etc., each with a single value. When extracting fields from events in Splunk, typically each field has a single value. ![]()
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