How to Prevent Keylogger Attacks?

Understand how to prevent keylogger attacks and know how keyloggers work. In this guide, we reveal all about keylogger prevention, including some of the best measures you can implement to thwart them.

A keylogger will record every keystroke you make on the keyboard. So whether you are typing in a password, credit card number, personal message or sensitive information, it will just log it in. Especially without your consent or knowledge and that is how adversaries steal your sensitive credentials online and from the dark web. If you are tired of encountering keyloggers or simply want to know what they are and how they work, then this guide is for you. We will go deep into the details of keylogging prevention and tell you what you can do to mitigate keylogging attacks. So, if you want to know how to prevent keyloggers, keep reading.

Why Preventing Keylogger Attacks is Important?

Credit cards, pins, CVV codes, and other sensitive details which are entered usually during online shopping are all compromised by keylogging attacks. Your private messages, emails, and personal charts can get leaked, which can lead to stalking and blackmail later on.

Attackers can use your stolen credentials to hack into bank accounts and make unauthorized transactions. In one case, a US construction company had lost $550,000 after a keylogger had caught its banking credentials via fairy emails. The financial services sector will see a 14% increase in cybercrimes from 2026 onward due to credential harvesting via keyloggers.

Keyloggers can steal your trade secrets, proprietary source code, and also monitor colleagues internally. Sometimes you may experience supply chain vulnerabilities and massive compliance risks, since devices can be shipped with built-in keyloggers installed in drivers.

How Keylogger Attacks Work?

Keyloggers work in different ways, depending on the type of Keylogger you encounter. Usually, they will intercept and record signals that are generated by each key strike on your keyboard. Then they store and transmit this data to unauthorized third parties. You have software Keyloggers which are special programs installed on your PC without your knowledge or consent. These can be API-based, kernel-based, form-grabbers, and can even capture your screenshots, web browser history logs, and clipboard contents.

Hardware keyloggers are keyloggers that are physical devices which have to be manually installed on your systems. They are more accurate and can capture information as they pass through, which is usually stored in internal memory. Some of them can be embedded inside your keyboard's internal circuitry also.

Types of Keyloggers

As we said before, software-based keyloggers can be categorized into API-based, kernel-level, form-grabbing, browser-based and JavaScript-based keyloggers. JavaScript based keyloggers are malicious scripts that are usually injected into websites. They can record your keystrokes within webpages.

Hardware-based keyloggers are keyboard overlays which are fake keypads placed over legit ones. These are used for ATM skimming attacks. USB keyloggers can be plugged into the USB ports of your devices or keyboards. You also have accounts to keyloggers which can record the unique sounds produced by different keys to figure out what's being typed. Because they can visually record what a user is entering, whether it's a password or a pin in gas forms, ATMs at different locations. You also have wireless keyloggers which can intercept data packets transferred from wireless keyboards to receivers.

Common Signs of a Keylogger Infection

There are different ways you can spot keylogger infections. These are some of the most common signs:

• Your devices will suddenly overheat, crash, or are prone to constant and fast battery drains, then that's a sign that a keylogger has been installed somewhere.
• You will also notice a lag between pressing your key and the character that appears on your screen. That's another classic sign.
• High RAM and CPU usage by unknown background processes, which can lead to system freezes and crashes, are telltale signs.
• Your mouse or cursor can also stutter or lag behind movements. If you see any weird icons or unrecognizable programs on your Windows Task Manager or Mac activity monitor, then watch out.
• Getting sudden 2FA notifications which you didn't ask for or seeing last-login locations which are not expected are also signs of unauthorized account access via keyloggers.
• If you notice any tiny unauthorized changes made to your banking profiles or transactions, then you can be sure that a keylogger is working in the background.

How to Prevent Keylogger Attacks: Best Practices

Here are some of the best keylogger prevention practices we recommend:

1. You can start using many AI-powered endpoint protection solutions to detect modern polymorphic keyloggers that are known for changing codes to evade signatures.
2. You can also use a password manager to auto-fill credentials directly to websites so that you don't have to type them out physically. Password managers are a great way to starve keyloggers of data since you don't type anything. So there's nothing to record.
3. Another good practice is to enable multi-factor authentication. MFA adds additional authentication factors like mobile PIN and fingerprints to prevent attackers from accessing your attacks. So even if they get a password or biometric, they can't get in unless they have everything.
4. Start using virtual keyboards which banks and financial entities recommend. These prevent you from typing keystrokes on your keyboard. Traditional software keyloggers can't get anything out of them.
5. You can also install keystroke encryption tools to encrypt your keystrokes in the OS kernel. So even if a keylogger captures your data, it will receive jumbled up nonsense.
6. Make backups of saved documents and store them on external drives or to Dropbox. So that you don’t lose your main files if a keylogger gets it. You can prevent keylogging attacks by educating your employees and help them prevent giving away sensitive credentials to outsiders (so they don’t fall prey to social engineering attempts).
7. Clear your temp files (temporary files) folder because it's a common place where most keyloggers hide and lurk.
8. Segment your networks and apply least privileges to prevent escalation attacks. Don’t give out unauthorized access to anyone. Never trust, always verify.
9. You should install next-gen firewalls to detect data exfiltration patterns. By using automatic form fillers you can prevent entering manual key strokes and they work similar to password managers.
10. You should also start using one time passwords for critical transactions since these are time-sensitive, single-use only, and cannot be reused in the future.
11. Review your USB port security and when it comes to online shopping, start using virtual card services to generate single-use card numbers or merchant-locked credentials which you don't have to key in again and again, thus preventing you from being keylogged.
12. Update your operating system, browsers and plugins and set up automatic updates because many keyloggers will take advantage of unpatched software vulnerabilities to gain entry into your resources and systems.

How to Detect and Remove Keyloggers

Most virus scans can detect keyloggers. You should check all add-ons on browsers and see if they come from reputable sources (websites should have the privacy badge icons and https:// prefix).

Check your task manager/system monitor to see what's running and check your startup apps. If you suspect a program is a keylogger, look it up on DuckDuckGo and open its process file path. Scan the executables with an online scanner and if it gets flagged, kill it. End the task in task manager and delete that directory permanently.

You can also do a clean install of your OS if you think you are seriously infected. Additionally, check for hardware dongles that link to mice and keyboards.

Common Mistakes That Increase Keylogger Risk

Poor cybersecurity hygiene, and physical lapses or human oversights are some of the most common mistakes that increase keylogging risks. If you download craft or pirated software, then there's a high chance that you're carrying bundled keyloggers. Don't click on malicious attachments and phishing links in emails. Don't ignore software updates and don't use admin accounts for running daily tasks.

Other common mistakes we can think of are relying solely on passwords, not using multifactor authentication, and leaving physical devices unattended in public. Don't use public terminals also for carrying out sensitive tasks and transfers and avoid using untrusted USB devices which are known to silently install keylogging programs.

How SentinelOne Helps Prevent Keylogger Attacks?

SentinelOne can prevent keylogger attacks via its autonomous AI-powered endpoint protection platform. It can identify malicious behaviors rather than just malicious file signatures and help you weed out more complex threats. You can detect suspicious patterns and any unauthorized processes that are attempting to hook onto your keyboard inputs. You can also find out if someone is trying to modify critical system settings and block them before they can capture your data. The SentinelOne agent can also kill malicious processes and quarantine associated files without having humans to manually intervene.

Storyline™ technology can automatically connect the dots between various file and system-related processes. Keep in mind that SentinelOne’s platform does not directly prevent keylogging attacks or log actual keystrokes. But its solutions can monitor processes and malicious files which often accompany keylogging attacks. For example, if an adversary injects a malicious script and attempts to execute it to run a keylogger on your network or system, SentinelOne can capture, flag, and contain it. You can also rollback any changes made to settings and systems, all the way back to their pre-infected states.

SentinelOne provides specific features to protect against credential theft such as protecting your secrets, rotating them, and enabling the least privilege principle of access. Many keyloggers are delivered in the form of malware payloads or strains which SentinelOne excels at detecting. You can block trojans, ransomware, API-based keystroke intercept requests, and unauthorized keyboard hooks as well with SentinelOne’s behavioral AI which can monitor process behaviors in real-time.

Conclusion

So, now you know how keyloggers work, how they operate, and what kinds of keyloggers you can possibly encounter: online and offline. Hopefully, now you can take the steps needed to ensure effective keylogger prevention. Make sure you educate your employees about keylogging mechanisms so that they can better protect themselves. And if you need further assistance, feel free to consult the SentinelOne team. We can help you prevent keyloggers by providing customized guidance.

FAQs

What is a keylogger attack?

A keylogger attack happens when someone installs software or hardware that records everything you type on your keyboard. This includes passwords, credit card numbers, messages, and search queries. The attacker can then access this information remotely or retrieve it from the device. Keyloggers are often deployed through malware, phishing emails, or physical devices attached to your computer. Once installed, they work silently in the background without you knowing they're there.

How do keyloggers infect a system?

Keyloggers get onto your system through malicious downloads, infected email attachments, and compromised websites. You might download a file that looks legitimate, but it contains keylogger code hidden inside. Phishing emails can also trick you into clicking links or opening attachments that install the keylogger. In some cases, attackers use trojanized software or exploit vulnerabilities in your operating system. They can also be physically installed as small hardware devices between your keyboard and computer.

How can you prevent keylogger attacks?

You can prevent keyloggers by keeping your operating system and software updated with the latest patches. Install a good antivirus or anti-malware solution and run regular scans. Don't download files from untrusted sources, and be careful about opening email attachments. Use multi-factor authentication so attackers can't use stolen passwords alone. You should also monitor your system for unusual activity and only visit secure, verified websites. Use strong, unique passwords that are harder to guess even if captured.

What are the signs of a keylogger infection?

Signs include your computer running slower than usual or freezing frequently. You might notice unexpected network activity or high disk usage. Your mouse might move on its own, or programs might open without you clicking them. Your internet connection could become sluggish, or you'll see unfamiliar processes running in your task manager. You might also notice pop-ups appearing randomly or your antivirus software being disabled. If you suspect a keylogger, disconnect your system from the network immediately.

Are hardware keyloggers harder to detect?

Yes, hardware keyloggers are harder to detect because they're physical devices between your keyboard and computer, so antivirus software can't find them. You have to physically inspect your setup to spot them. Software keyloggers are easier to catch with security tools and antivirus scans. However, hardware keyloggers won't work if someone steals your computer or you use a different keyboard. They also require physical access to install, which limits how many targets attackers can compromise at once.

Can a VPN prevent keylogger attacks?

No, a VPN cannot prevent keylogger attacks. A VPN only encrypts your internet traffic between your device and the VPN server, so the attacker can't see what websites you visit. But if a keylogger is already installed on your computer, it captures your keystrokes before they're encrypted. The VPN doesn't protect against local threats on your device. You still need antivirus software, strong passwords, and multi-factor authentication to defend against keyloggers effectively.