I noticed the following very large files that appeared on my server on a specific domain:<p>core.926<p>core.930<p>core.957<p>core.958<p>core.959<p>core.961<p>Each of the files is about 5GB in size. The web developers working on the website have no idea how the files got there.<p>I've since deleted them, but I'm just curious if anyone knows what these are. Is this some sort of vulnerability? Malware? Out of date WP plugins causing this? A search doesn't seem to pull up anything useful.