In each of my sites, Defender has listed several potentially harmful files in WordPress core. There were two types of warnings:
• Unknown file in WordPress core
• This directory doesn't belong to WordPress core
I went through and deleted them all, one by one—and then three of my sites crashed!
I restored the sites but those same warnings in Defender are back.
Here is one site: http://www.nealumphred.com/wp-admin/admin.php?page=wdf-scan
Thanks in advance,