Hi there,
Sadly, malware scanners (no matter how much they cost), they can't find what a skilled IT expert can, since the nature of malware itself is a code that does things using the same functions that harmless scripts do; functions like file_get_contents, and file_put_contents, fwrite, in addition to custom functions, and deobfuscation to frustrate people who don't have what it takes to get to the bottom of things.
Anyway, If you're looking for a god-tier service that includes:
1 - Carefully, and precisely removing all the files that are purely malicious code.
2 - Carefully, and precisely disinfecting all the infected files, and database entries to ensure stability after your website is virus-free.
3 - Setting up Wordfence Premium to notify me whenever there's any kind of suspicious activity, so that I can always stay one step ahead of hackers, and their malicious scripts, and bots, so that malware will NEVER EVER come back under my watch.
4 - A lifetime warranty, so that you won't have to risk hiring an incompetent freelancer for your security needs ever again.
Let me know. I look forward to your response.
Best regards,
Ahmed Anssaien
IT Expert