It;s likely that one of your plugins has a backdoor allowing them in. Update WP first, then disable all plugins. Re-enable them one at a time until you find the issue.
Have used a theme or plugin from a shared download site?
If so, then backdoor most likely, also, if that is the case, please
post again in this thread so as to advise other members.
Thanks
If they can get root access, they can infect every php file. Very simple to do.
Suggestion: Get a dedicated and hire a 'real' pro to handle the security. I can ref you if you need it... Expect to pay $200 or more for him to lock it down.
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