Keylogger

What is a Keylogger?

A keylogger is a type of malware or hardware device that records every keystroke made on a computer or mobile device. Keyloggers are used by attackers to capture sensitive information such as passwords, credit card numbers, and private messages.

How Keyloggers Work

Software Keyloggers

• Process injection – Injects code into legitimate processes
• API hooking – Intercepts keystrokes at the operating system level
• Browser extensions – Captures input from web browsers
• Remote access – Sends captured data to attackers

Hardware Keyloggers

• Physical devices – Placed between keyboard and computer
• Wireless keyloggers – Capture keystrokes from wireless keyboards
• Mobile keyloggers – Installed on smartphones and tablets

Detection and Prevention

• Antivirus/anti-spyware – Use reputable security software
• Behavioral monitoring – Watch for suspicious activity
• Physical inspection – Check for unauthorized hardware
• Patch management – Keep systems updated
• User education – Avoid suspicious downloads and links

Removal and Response

• Quarantine and remove – Use security tools to remove software keyloggers
• Physical removal – Inspect and remove hardware devices
• Change passwords – After removal, update all credentials
• Monitor accounts – Watch for unauthorized activity

Best Practices

• Download from trusted sources – Avoid third-party sites
• Regularly update software – Patch vulnerabilities
• Use strong authentication – Protect sensitive accounts
• Educate users – Raise awareness of keylogger risks
• Implement incident response plans – Prepare for keylogger incidents