JavaScript Keyloggers
Malicious scripts that capture user keystrokes to steal sensitive information.
Understanding:
A JavaScript keylogger is a malicious script designed to capture and record keystrokes entered into a web page. Unlike traditional keyloggers that operate at the operating system level, JavaScript keyloggers execute within a web browser, often through malicious websites, compromised forms, or injected scripts.
Common Applications and Use Cases:
Credential Theft – Attackers use JavaScript keyloggers to steal usernames, passwords, credit card details, and other sensitive input.
Phishing Attacks – Often deployed through malicious phishing websites that mimic legitimate login pages.
Exploiting Vulnerable Websites – Cybercriminals inject keylogging scripts into compromised web pages, forums, and e-commerce platforms.
Session Hijacking – Captured keystrokes can be used to bypass authentication mechanisms and gain unauthorized access to user accounts.
Best Practices and Security Considerations:
Use Content Security Policy (CSP) – Restricts the execution of unauthorized JavaScript on web applications.
Implement Secure Input Fields – Disable JavaScript-based input logging for sensitive fields such as passwords and financial information.
Enable HTTP Security Headers – Use X-Content-Type-Options, X-XSS-Protection, and SameSite cookie attributes to prevent script injection.
Deploy Web Application Firewalls (WAFs) – Detects and blocks malicious scripts attempting to capture keystrokes.
Educate Users on Phishing Risks – Encourage users to verify URLs before entering sensitive data and avoid clicking on unknown or suspicious links.