A keylogger is a type of software or hardware device that records every keystroke on a computer or mobile device and is often used by attackers to steal sensitive information such as passwords or credit card numbers.

What is keylogger?

Keylogger is a type of software or hardware tool that records every keystroke entered on a keyboard. Cybercriminals use it to collect sensitive information such as login credentials, credit card numbers, or personal data. In corporate environments, keyloggers pose a serious security threat by allowing attackers to silently gain access to internal systems and confidential information.

How keylogger appears in practice?

Examples of real-world scenarios:

• An employee downloads a malicious email attachment, silently installing a keylogger on the system.
• An attacker physically connects a hardware keylogger between a keyboard and a computer in a meeting room.
• A poorly secured mobile device allows the installation of a malicious app that records keyboard inputs or touch gestures.
• The keylogger captures login credentials for online banking or internal enterprise systems.
• A security audit detects an unusual process quietly collecting input data in the background.

Summary:
Keyloggers can monitor user activity over extended periods without detection. The loss of sensitive data isn’t a matter of hours—it can happen in seconds.

How is keylogger different from similar terms?

• Keylogger – Specifically records all text entered via keyboard.
• Spyware – A broader category of malicious software that monitors user activity.
• Screenlogger – Captures screenshots rather than (or in addition to) keystrokes.

Explanation:
While spyware may track browsing history, files, or location, keyloggers focus strictly on capturing text input. This makes them particularly effective for stealing passwords, PINs, and other sensitive credentials.

How to protect your company against keyloggers?

Recommended steps:

1. Use modern, regularly updated antivirus software.
2. Implement behavioral detection tools that can spot unusual processes.
3. Conduct regular security audits and check endpoints for unauthorized software.
4. Limit administrative privileges to reduce risk of unauthorized installations.
5. Train employees on phishing and social engineering awareness.
6. Consider hardware-based authentication (e.g., security keys, multi-factor authentication).

Additional Note:
Keyloggers are often underestimated because they operate silently and rarely affect device performance. Their stealth, however, is precisely what makes them so dangerous. Proactive prevention and timely detection are key to avoiding data leaks, reputational damage, and financial losses.