Hans Christian on "[Malware?] Can't remove "reg.ru" malware"

Thank you so much!

I've read most of your links (some are too much for reading and understanding), but I do the following according to your links:

1. Recommended plugins and scans:
   • Exploit Scanner: ok
   • Theme Authenticity Checker (TAC): ok
   • unmaskparasites.com scanner: doesn't work
   • Sucuri.net scanner: ok
2. Other things done:
   • WordPress reinstalled
   • .htaccess file: ok
   • wp-config.php file: ok
   • Inactive themes: deleted
   • WordPress login, FTP and Mysql password changed
   • File/directories permissions checked 0644 and 0755)

I'm front-end developer but I haven't enough security skills to deal this problem.

Any extra idea? Thank you in advance!

Chris.