Check for crap in /var/lib/mysql like this

ls -al /var/lib/mysql/
total 20888
drwxr-xr-x 24 mysql mysql     4096 Oct  3 18:30 .
drwxr-xr-x 20 root  root      4096 Oct  3 04:23 ..

-rw-rw-rw-  1 mysql mysql    11776 Oct  3 17:10 c:\exp.exe
-rw-rw-rw-  1 mysql mysql    48128 Oct  3 17:10 c:\exp1.exe
-rw-rw-rw-  1 mysql mysql    55296 Oct  3 17:10 c:\exp2.exe
-rw-rw-rw-  1 mysql mysql    33812 Oct  3 17:10 c:\tan.exe
-rw-rw-rw-  1 mysql mysql    45056 Oct  3 17:10 c:\tan1.exe
 

This happened to a client who didn't firewall their port 3306 and had a weak root password.

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