i get your comment, you work for eset, the point is Eset lacks a good behaviour blocker that works together with the firewall.
And linux/mirai is indeed the name of the file, but detected with Sonar, If Sonar is enabled ALL users of Norton are protected regardless if they received the signatures or not. Thats what @wraith is trying to point out, if Eset does not detect by received signatures the virus or malware slips through the security, there is no active BB or online check active or the online check is hibernating and not active, i personally never seen the behaviour blocker of Eset in action ( im an active malware tester ).