subdomain redirected the main domain.

Hey guys, I am facing a problem where a subdomain was created automatically (mail. domain.com), I checked my server, and DNS there is no subdomain created. Can anyone tell me how to solve this problem?

Note: this was started after a Chinese attack on the website, I removed clean and fresh install all the files but some created Chinese URLs every day, Previous Chinese URLs were removed from the GSC Removal Tool.

Hello Buddy, Sorry to know that!

Perform a server-wide search for any leftover malicious scripts or redirects.
Also implement security measures like firewall rules to prevent unauthorized subdomain creation or redirects post-attack.

1linkwarrior said:

Hello Buddy, Sorry to know that!

Perform a server-wide search for any leftover malicious scripts or redirects.
Also implement security measures like firewall rules to prevent unauthorized subdomain creation or redirects post-attack.

Click to expand...

Thanks for the suggestion, Can you tell me how I can search for redirects or scripts I couldn't find on server.

rapkishor said:

Thanks for the suggestion, Can you tell me how I can search for redirects or scripts I couldn't find on server.

Click to expand...

To detect redirects or hidden scripts, utilize tools like Screaming Frog or online redirect checker tools,
examining HTTP headers or using browser extensions like Redirect Path for in-depth analysis beyond server logs.

1linkwarrior said:

To detect redirects or hidden scripts, utilize tools like Screaming Frog or online redirect checker tools,
examining HTTP headers or using browser extensions like Redirect Path for in-depth analysis beyond server logs.

Click to expand...

Hey buddy, using "site:domainname.com", I find out 3 URLs from a subdomain (mail.domain.com) but I didn't create this subdomain. I checked the server there is no subdomain. Can you tell me how I can fix this?

Note: I didn't use any nulled plugin or theme or any scripts.