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WordPress Sites hacked due to POST SMTP Plugin – How to solve the Aftermath? [closed]

Closed. This question is not about programming or software development. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack Exchange site, you can leave a comment to explain where the question may be able to be answered. Closed 2 days ago. Improve this question I am also a victim of the hack with the identifier CVE-2023-6875 [Post SMTP authorization bypass] All Wordpress websites as well as static pages on one of my servers were affected. I have since moved most of the websites to a new server using backups from before the hack. I have also updated all plugins including Post SMTP, as the vulnerability should be fixed from version 2.8.8 (I am using 2.8.11) -> However, I had to move a single page without a backup and cleaned it up manually beforehand. I installed a fresh WP, copied the Theme folder and restored the database. This went well for about a week until the first obfuscated files reappeared. I have already verified the checksums of the core files using wp-cli and also had Sucuri scan the Wordpress instances for malware - everything went smoothly. Has anyone already found a permanent solution to this or any idea what mechanism is used to recreate the files and inject code into existing index.php files? I am grateful for any input! I tried to manually remove the obviously malicious Code injected into regular files and the obfuscated files as a whole, checked the core wp files with wp-cli checksums, scanned with sucuri for malware. I Listed every changes that were made the past days with: find . -mtime -2 -ls and went throught that list.
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