What is keylogging? How to detect if your device has been compromised

Keylogging, or keystroke logging, is a method used by cyber criminals to monitor and record your keystrokes. It’s a form of spyware that collects sensitive information such as login credentials, credit card numbers and personal messages. Keyloggers can be installed on computers, smartphones, or tablets and pose a significant threat to your digital security and privacy.

How keylogging works

Keyloggers are often deployed through phishing attacks, malicious downloads or vulnerabilities in outdated software. Once installed, they run quietly in the background, capturing every keystroke you make. This data is then transmitted to the attacker, who can use it to access your accounts, steal your identity, or conduct financial fraud.

There are two main types of keyloggers:

1. Hardware keyloggers: Physical devices plugged into your computer, typically between the keyboard and the USB port.

2. Software keyloggers: Malicious programs installed on your device to monitor and log keystrokes.

Signs your device might be compromised

If a keylogger is present on your device, you may notice unusual behaviour or performance issues. Here are some telltale signs:

1. Unusual data usage: Your device consumes excessive data even when idle, as the keylogger transmits captured data to a remote server.

2. Frequent freezing or crashes: Keyloggers can interfere with normal application performance, causing your device to freeze or crash frequently.

3. Overheating: Background processes initiated by keyloggers can overwork your device’s processor, leading to overheating.

4. Battery drain: A compromised device may have reduced battery life due to hidden processes running continuously.

5. Unexplained text messages or emails: Keylogger installation on smartphones may involve suspicious text messages or links.

6. Strange noises: Some users report hearing background noise during calls, potentially caused by spyware running on the device.

Detecting keyloggers on different devices

On Smartphones (iPhone/Android):

1. Monitor performance: Look for excessive data usage, overheating, or reduced battery life.

2. Check downloads: Review recently downloaded apps or files for anything unfamiliar.

3. Use Two-Factor Authentication (2FA): Even if a hacker obtains your credentials, 2FA can block unauthorised access by requiring a second verification step.

4. Install security apps: Use trusted antivirus and anti-spyware tools to scan for keyloggers.

On Computers (Windows/Mac):

1. Use Task Manager or Activity Monitor: Check for suspicious processes consuming significant system resources.

2. Search for unfamiliar programs: Inspect installed software for anything you don’t recognise.

3. Clear temporary files: Keyloggers often hide in temporary files.

4. Use Anti-Malware solutions: Specialised anti-rootkit and anti-spyware tools can detect and remove keyloggers.

5. Keystroke encryption: Install software that encrypts your keystrokes, making it difficult for keyloggers to decipher the data.

Preventing Keylogger Attacks

To safeguard your devices and data, follow these best practices:

1. Update your operating system: Regular updates patch vulnerabilities that attackers might exploit.

2. Use strong, unique passwords: Avoid reusing passwords across multiple accounts.

3. Be cautious with downloads: Only download apps and files from trusted sources.

4. Adjust browser security settings: Block malicious websites and disable unnecessary plugins.

5. Enable Two-Factor Authentication: This adds an extra layer of security to your accounts.

6. Regular security scans: Use reputable antivirus software to conduct routine scans.

How to Remove Keyloggers

If you suspect your device has been compromised by a keylogger, take the following steps:

1. Uninstall suspicious programs: Remove any unrecognised or dubious software.

2. Reset your device: Perform a factory reset to eliminate persistent malware.

3. Change login credentials: Update passwords for all affected accounts immediately.

4. Reinstall the Operating System: If necessary, completely reformat your device to ensure the malware is removed.

5. Consult a professional: If you’re unable to resolve the issue, seek assistance from cyber security experts like REVIO.

Keylogging is a serious cyber security threat that can compromise your personal and financial information. By staying vigilant and following best practices for detection and prevention, you can protect your devices and data from this insidious form of spyware. Always keep your software up to date, use reliable security tools and practice safe browsing habits to minimise your risk.