Hola,
To completely fix this following steps will be necessary:
-- Backup all websites including files and DBs
-- Scan all websites one by one to find all malware in the files, DBs and other Cpanel locations
-- Complete removal of all malware from all websites one by one from files, DBs etc
-- Installation of security plugins, firewalls and settings on all websites one by one to strengthen the security and minimize risk of hacking again
-- Check remaining locations on server/cpanel
-- Backup all websites again so that you get a backup of safe and malware-free websites
-- Unnecessary files, themes, plugins and data from server will be removed also.
Please share further details.
I am available on Chat if you want to discuss project details.
Some Recent Malware Removal Projects Done:
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Thank You
Imran Ali