What's with the weird connection in MySQL?

Question

MySQL

A strange MySQL connection appeared in the logs without a connection address.
Strange for two reasons, because it is not done by someone who would have access to the server, but also because it drops my tables, which I only have time to backup.
An example of "weirdness":

73460 Connect	[email protected] on
    73460 Query	SET NAMES utf8
    73460 Query	show databases
    73460 Query	SELECT table_name FROM information_schema.tables WHERE table_schema='auth'
    73460 Query	DROP DATABASE auth

Answer 1

Admit it, the freelancer did not get paid extra? )

Answer 2

Connect [email protected]
So the server itself is broken. Change the root password in the system, set the password to [email protected] in MySQL. See /var/log/auth.log

Answer 3

lol