A. Define a lookup table in XSIAM that maps 'audit_type' values to 'event_category' values and apply it within the XSIAM query language during analysis. This doesn't address normalization during ingestion.

B. In the XSIAM 'Data Source Configuration' 'Normalization Rules', use a 'Field Mapping' rule with conditional logic (e.g., 'if audit_type 'SYSCALL' then event_category = 'Process") to map 'audit_type' to 'event_category' based on specific values.

C. Modify the parsing rule to include nested regex groups that directly extract the desired 'event_category' based on the 'type' field during the initial parsing phase. This is less maintainable for complex mappings.

D. Create a Python script that continuously pulls data from the raw log index, performs the mapping, and re-ingests the normalized data into a new index. This is overly complex and inefficient for a native XSIAM function.

E. Utilize XSIAM's 'event_categorization.json' configuration file on the backend servers to directly hardcode the 'audit_type' to 'event_category' mapping. (Note: Modifying backend files directly is generally not recommended without Palo Alto Networks support guidance and may be overwritten by updates).