What Is a Keylogger? Definition, How It Works, Types, and How to Avoid It

Digitalization has become increasingly widespread, and increasingly advanced digital technology is now enjoyed by almost everyone. This digital progress comes hand in hand with the increasing potential for cyberattacks. Keyloggers are an illegal practice used by cyberattacks to steal sensitive information and should be avoided.

Understanding Keyloggers

What is a keylogger? This is a program that is used illegally to record keystrokes on a device’s keyboard, whether it’s a computer, smartphone, or other device. The purpose of using a keylogger is usually to steal data, such as passwords, bank card information, and other sensitive data without the victim’s knowledge.

Keyloggers can have varying characteristics; some are installed secretly without the victim’s knowledge. Others require physical access to the device. When used illegally, keyloggers can be extremely damaging. This breach of privacy can be detrimental to both individuals and companies.

Types of Keyloggers

Keyloggers can generally be divided into two main types: hardware and software. Here’s a more detailed explanation of keylogger types:

1. Software program

Keyloggers can be programs intentionally downloaded onto the target device. Keylogger software typically functions as a rootkit. The keylogger is stored on the device’s system and operates silently, making it undetectable by the system.

Illegally exploited keylogger software is usually shipped with malware, making it extremely dangerous. These keyloggers are difficult to detect due to the rootkit. There are several categories of software keyloggers, including the following:

– API

The most common category of keyloggers is an API that intercepts signals from the keyboard to the application or program the user is using.

– Kernel

Another category of software keylogger is the kernel, which is difficult to write; these keyloggers are not commonly implemented. Once installed, the keylogger is difficult to detect or mitigate because it has already received the target device’s keys.

– Screen scrapper

A screen scrapper aims to record everything that appears on the device’s screen.

– Browser

This keylogger is more complex than the kernel-level one, and its impact is very dangerous. Browser keyloggers record data entered when the target victim fills out a form on a website.

2. Hardware-based

While there are software-based keyloggers, there are also hardware-based keyloggers. As the name suggests, these keyloggers are hardware-based and connected to the main device. Hardware keyloggers can take the form of USB storage devices, keyboards, modules installed on keyboards, and so on.

This category of keylogger cannot be detected by antivirus programs. Why? Because they are not installed on the computer and use their own internal storage for data storage and encryption.

How Keyloggers Work

In many cases, using a keylogger is illegal, but there are also cases where keyloggers are considered legal. However, we must still be careful about using keyloggers, as they can compromise data on our devices. It’s important to understand how keylogging works. Consider the following points to explain how it works:

•⁠ When a user opens a file from a phishing email message or clicks on a link, a keylogger can be installed.

•⁠ Software can also be installed using website scripts that exploit vulnerable browser systems. The software is launched when a user visits a website.

•⁠ When a user clicks on the link, their device automatically installs the spyware without the victim knowing.

•⁠ Spyware monitors, logs, or records a user’s keyboard input, including passwords, sensitive information like account information, and so on. Spyware also summarizes what it observes on the victim’s device. That’s roughly how a keylogger works.

How to Avoid Keyloggers

We must be wary of keyloggers. At the very least, take the following steps to avoid keylogging.

– Consider a virtual keyboard

Keyloggers generally cannot log or record input on a virtual keyboard system. Using a virtual keyboard is inconvenient, but consider this as an alternative to typing passwords and other sensitive data.

– Rely on a high-performance antivirus program

The most effective way to avoid keyloggers is to use an antivirus program. However, make sure it’s regularly updated. Modern antivirus programs are usually equipped with algorithms to detect keyloggers. This antivirus program can identify and even remove programs suspected of being keyloggers before they have a chance to steal information.

– Update your OS

It’s not just antivirus software that you need to pay attention to; update your device’s OS as well. Keyloggers often exploit operating system vulnerabilities. Software should also be up-to-date to reduce the likelihood of keyloggers infecting your device.

– Beware of phishing emails

Quite a few keyloggers are found in phishing emails, which may include malicious attachments. Avoid opening attachments from unknown or suspicious emails.

– Firewall

A firewall can also prevent keyloggers. It prevents keyloggers from accessing the internet and sending previously collected data or information. Therefore, ensure this firewall is always active and configured correctly.

– Two-Factor Authentication

Another way to prevent keyloggers is to implement two-factor authentication. Even if a keylogger program obtains your password, it cannot gain access to your account without the second factor being met. The most common example is an authentication code sent to your email or mobile phone.

– Be extra vigilant when using public computers

Public computers include those found in internet cafes, libraries, and other locations. These public computers can be targets for keyloggers, so remember not to input sensitive information on them.

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