Auto generate files.

Hi

I have wordpress site. since last month, everyday 2 files generated automatically and, index.php edited with some base64 code which causes open few page, if anyone open my site.

When I deleted these files and base64 code from my site, site works fine. and these file generation happens twice daily.

Please guide me how to resolve this activity.

Thanks.

Your server might be hacked/compromised.
One thing you could try is to change your login credentials for your Web Hosting/Server and/or FTP.
If that doesn't fix it, I'd recommend contacting the owner of your Web Hosting/Server.

Tip: Try to keep your WordPress version up-to-date. There's new vulnerabilities getting released almost every week or so.

I wouldn't recommend using WordPress at all, but if you are a beginner, it's fine.