There is a flaw in the Palo Alto ‘category’ field reported to Splunk.
When the URL Filtering Policy has the same action for each category, each new category replaces the previous one in the log field. This is done alphabetically (a-z).
What this means to us:
Splunk URL searches are still reliable, however they should be followed up with a query against the PA categorization web site. This web site will report if the URL is multi-categorized.
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