Website, malware infected solution
If your website has been the malware-infected, is depended on level of the infection.
The example here, that is the high level of infection:
Or even the worth version of the virus the dolohen.com/apu.php managed to insert itself on every single page or post on WordPress on the Mysql server.
Solution A: If you have a clean backup, the best solution is to delete the old database and restore the clean backup. after that, you can use different online malware scanner like sucuri
Solution A: If the infection is only on a couple of records, you just manually deteled et Voila!