Many years ago a previous (large nationally known) employer caught a zero day virus (variant of a well known worm) that was spreading across the network replicating onto every machine. We contacted our AV vendor, followed their advice to switch the entire network off. They flew 6 engineers over who arrived before the end of the working day. Within hours they had sent samples back to base and pushed out updated signatures (ready globally) and by early the following morning they had provided clean up instructions and helped clean things up.
This is a major brand AV Vendor known in the consumer world for their pre-installed shovel-ware and shoddy customer supporter (trust pilot score of 1 and a bit ).
submitted by /u/NGRhodes
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Author Of this post: /u/NGRhodes