Review and clean the compromised files

Please help me with this, Siteground hosting :

------------------------------------------------------------------------------------------------------------------------------

"We believe that your website application might have been compromised!

In order to secure your website application, I recommend you to contact a professional third-party developer to help you review and clean the detected files.

You may also try to clean the infected files on your own, however you should proceed with caution, as simply removing the infected files may lead to further issues and your website application may cease to function correctly.

Here is a list of the required actions that need to be performed before we can lift the limit:

The detected malicious files should either be cleaned of deleted;
All apps/themes/plugins not in use should be removed;
All apps/themes/plugins in use should be updated to their latest stable versions;
All passwords should be changed with strong ones.

Finally, I went ahead and allowed access to the website application from your IP address 113.210.125.126 so you can proceed to taking the required actions whenever you are ready.

Please clear your browser cache as per the following guide:

https://my.siteground.com/support/kb/how_to_clear_cache_in_firefox_internetexplorer_safari_opera

and proceed to verifying you can access the website application.

After that, review the provided information and proceed to taking the required actions at your earliest convenience.

Update this ticket once you are done, so we can run another malware scan on your account and review the case further.