Today I realized that I was unable to post a comment on my blog and was told that the file wp-comments-post.php does not exist. But I can see it on my server. The problem is, the chmod abilities have somehow become 000, so I have lost the ability to read, write, and execute the file.
I realized that the same had happened to many other files. When I try to change the file permissions, it says "Permission Denied."
What my site hacked? I'm using the most recent version of WordPress.