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How to prevent disabling or kiling ESET proceses !!!

On our network we have ESET ENDPOINT antivirus with 50 licenses with regular updates. We recently had a Phobos Ransomware virus attack with a (. [Painplain98@protonmail.com] .calix) extension that infected the entire network including the server. How is it possible that ESET ENDPOINT did not detect it? Does the eset not detect these types of viruses ?. All in all a bad reputation for ESET.