Hello,
I suppose you are talking about Dashboard section on FMC.
The threat section consists of host, IOC, SI category. The dashboard widgets consists of data from other connetion tables which you can see by expanding the widget table.
Check if FMC has any data of IOC or security intelligance.
I suppose you should still see data in widget Malware Threat if you have data in Analysis>Files>Malware events,
I have attached a screenshot which would help explain how can you expand the widget and check the table from where its taking its data.
Rate if helps.
Yogesh