malware db retrieval and usage

Which components (DIR,SD,FD,etc) of Bacula retrieve the malware database 
from the internet and which components use the malware database?

I need to know because our production servers are forbidden from 
accessing the internet for updates so we have an in-house repository 
server most everything.  I need to configure the correct Bacula 
components to retrieve the malware database from our in-house repository.

Also, which databases do I need to replicate onto our in-house repository?

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