Website hacked: admin user created admin-Ajax.php calls

Hi,

I had an issue since last May 2019, my site was redirected and therefore hacked. There were quite a few admin users added in just a few days.

I had installed iThemes security with brute force protection and host lockouts. This all didn’t prevent the issue.

  1. restored the site to before 30 May
  2. changed admin users names and passwords
  3. rechecked all iThemes settings and even removed backend standard url (wp-login url)
  4. installed IQ block ip plugin. Limited countries hat could access the backend and front end

No change. In a day another admin user was added! Although less with step 4.

  1. installed anti spam by CleanTalk plugin. Then it stopped the adding of admin users.

After a long two weeks of this issue, I finally found the culprit:


Affected Plugin: Convert Plus
Plugin Slug: convertplug
Affected Versions: <= 3.4.2
Patched Version: 3.4.3

My issue:
I haven’t looked at theme X for two years. Plugins that are included in the theme used to be updated when a new theme x was pushed (so over time plugins are updated by the plugin developer, but not theme X … yet). So an annoying update notification will appear in the plugin folder, which you can’t update… so I thought.

Solution:
I deactivated and removed the convert plus plugin version 3.4.1. And installed it again for the Theme X plugins overview. Version 3.4.4. Was installed. I guess that solved the vulnerability.

Question: how are plugins to be updated these days with theme x?
A) by a theme X update
B) through the standard Wordpress plugin menu

Thanks

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