Check server logs: Start by checking the server logs to see if there are any unusual or suspicious activities. Look for any unauthorized access attempts, unusual traffic patterns, or suspicious file modifications.

Check website files: Check the website files for any unauthorized changes or additions. Look for any malicious scripts, backdoors, or malware that may have been added to the website.

Check database: Check the website database for any suspicious activities or unauthorized access. Look for any unauthorized changes to the database, such as new user accounts or modified content.

Scan for malware: Use a website security scanner or antivirus software to scan the website for malware or malicious code. This can help identify any malicious files or scripts that may have been added to the website.

Update software and plugins: Make sure that all server software, plugins, and scripts are up to date. Vulnerabilities in outdated software can be exploited by hackers to gain access to the server.

Change passwords: Change all passwords for the website, server, and database. Use strong, unique passwords to prevent unauthorized access.

Implement security measures: Implement security measures such as firewalls, intrusion detection systems, and regular security audits to protect the website from future attacks.

Restore from backup: If the website has been compromised, consider restoring it from a clean backup to remove any malicious code or files that may have been added by the hacker.

Investigate the attack: Investigate how the website was compromised to prevent future attacks. Look for any security vulnerabilities that may have been exploited by the hacker and take steps to address them.

Seek professional help: If you are unable to identify and fix the security breach on your own, consider seeking help from a professional security expert or a cybersecurity firm. They can help you identify and fix the security vulnerabilities and ensure that your website is secure.