Hello Davide,
zSecure Adapters for SIEM, or zSecure Audit, are required if you want to use the functionality provided by zSecure to enrich SMF audit events and send that enriched data to QRadar as LEEF records.
I don't know which logs your customer wants to send to QRadar, but zSecure can send both enriched SMF audit event data, or alert data to QRadar (for alerts, you would also need the zSecure Alert product suite component) out of the box.
Regards, Mike
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