How to Remove Malware from a Hacked CodeIgniter Application

CodeIgniter is a lightweight PHP framework often used for custom applications, so cleaning a compromised one blends framework knowledge with a review of your own code. Find the injected code and backdoors, rotate your credentials, and patch the vulnerability — then redeploy from a clean source.

Step 1: Secure access and credentials

Change your cPanel, database and FTP passwords, and update any keys and database credentials in your config. Take a full backup before altering files.

Step 2: Scan and locate the infection

Run a malware scan and review recently modified files, unexpected files in your uploads or writable folders, and unfamiliar controllers or scripts. Search for webshells and backdoors.

Step 3: Clean or restore

• Restore a clean pre-infection backup if you have one.
• Clean manually by removing malicious files and replacing the CodeIgniter system files with a fresh official copy of your version, keeping your application code and config — after verifying your own code is clean.

Step 4: Review your application code

Custom code is often the weak point. Compare against version control to find injected changes, and look for the flaw that allowed entry — commonly an unvalidated file upload, an injection vulnerability, or exposed credentials. Check the database for injected content.

Step 5: Patch, redeploy and harden

Fix the vulnerability, update the framework, redeploy from clean code, and follow the hardening checklist.

Frequently asked questions

The framework is clean but it got hacked again.

The vulnerability is likely in your custom code, not the framework — an unvalidated upload or injection point. Review and fix that, or the site will keep being re-exploited.

How do I protect writable folders?

Ensure upload and writable directories cannot execute PHP, validate every uploaded file, and keep them outside the web root where possible. This closes a very common entry route.

Is manual cleanup risky?

It can be if a backdoor is missed. Where you have clean version control or a backup, redeploying from it is safer than trying to disinfect files one by one.