SEPM Virus Definition Issue

Dear All,
 

We are using SEPM 11x and facing a very unique problem everyday (for me its unique though) :-

Everyday In SEPM Home Window . There is a new Virus Definition Distribution indicating Date. I dont know from where its getting update for  Virus Definition Distribution because server is not connected to internet. Is it making these definitions itself .  I have no clue. Please guide me.

Here is the snap fyr..

Thanks and regards,

Navii