That’s a tough situation — sorry you had to go through it. From what you described, it sounds like the attacker was able to inject a malicious JavaScript file into your checkout page. This usually happens through:
A compromised admin account (even briefly)
Vulnerabilities in third-party modules or themes
Weak file permissions on the server, allowing unauthorized edits
Outdated extensions that can be exploited
Resetting admin passwords and blocking suspicious IPs are great first steps. Beyond that, here are a few additional recommendations:
Audit all third-party modules and remove any that aren’t necessary
Use Magento’s built-in Content Security Policy (CSP) to block unexpected external scripts
Regularly scan your filesystem for unauthorized changes
Keep your Magento core and all extensions up to date
Consider using a Web Application Firewall (WAF) for real-time protection
Sometimes it also helps to get a professional security audit, especially after an incident like this.
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Hope this helps, and best of luck securing your site moving forward!
