Verifying that I have fully removed a WordPress hack?

Have you identified the exploit vector? If not, you may be leaving yourself open to future exploit.

Other things to consider:

  1. Change WordPress admin user passwords – done
  2. Change Hosting account user password
  3. Change FTP passwords
  4. Change MySQL db user password – done
  5. Change the db table prefix
  6. Update your wp-config nonces/salt
  7. Check your directory/file permissions
  8. Block directory-browsing access, via .htaccess
  9. Go through everything in the Hardening WordPress Codex entry
  10. Go through everything in the FAQ My Site Was Hacked Codex entry

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