by The Computing Australia Group | Stop Spyware Before
It Steals Your Data
Spyware is one of the most intrusive and dangerous types of malware affecting individuals and businesses today. Unlike obvious viruses that may crash your device or display alarming messages, spyware is designed to stay hidden. Its purpose is to monitor your activity, collect sensitive information, and send that data to someone else without your knowledge or permission.
For businesses, spyware can lead to stolen passwords, compromised financial information, data breaches, identity theft, reputational damage, and even regulatory issues. For individuals, it can expose private messages, banking details, browsing history, photos, location data, and personal accounts.
Modern spyware is far more advanced than the pop-up-heavy programs many people remember from the early internet era. Today, spyware can include keyloggers, credential-stealing malware, remote access trojans, malicious browser extensions, mobile stalkerware, and stealthy rootkit-based threats that are difficult to detect using basic security tools.
This guide explains what spyware is, how it works, the warning signs to look for, how to remove it from your devices, and the best ways to prevent it from coming back.
What Is Spyware?
Spyware is a type of malicious software that secretly collects information from a device or system. It may be installed through deceptive downloads, phishing emails, fake software updates, infected websites, malicious advertisements, unsafe browser extensions, or compromised apps.
Once installed, spyware can monitor what you do on your device. Depending on the type of spyware, it may collect:
- Usernames and passwords
- Browsing history
- Email content
- Screenshots
- Keystrokes
- Location data
- Device information
- Business documents
- Customer records
- Chat messages
- Login session cookies
- Camera or microphone activity in severe cases
The stolen information may then be used for identity theft, financial fraud, blackmail, corporate espionage, account takeover, or further cyberattacks.
In a business environment, spyware can be especially harmful because one infected device may become the entry point for a wider network compromise. If an attacker captures an employee’s login details, they may gain access to email, cloud storage, accounting systems, customer databases, or internal business platforms.
Spyware vs Legitimate Tracking
Not all tracking is spyware. Many businesses use legitimate tools such as website analytics, CRM tracking, marketing pixels, cookies, device management software, and security monitoring tools. These tools can help businesses understand user behaviour, improve services, personalise communication, and protect company systems.
The difference comes down to transparency, consent, and purpose.
Legitimate tracking should be disclosed clearly through privacy policies, consent banners, employment agreements, or IT policies. Users should understand what is being collected and why.
Spyware, on the other hand, is hidden, deceptive, or installed without meaningful consent. It is designed to collect information in a way the user has not agreed to. In many cases, spyware is used for exploitation rather than legitimate business or security purposes.
For workplaces, this distinction is important. Businesses may have valid reasons to monitor company devices, manage security, or audit systems. However, employee monitoring should always be transparent, proportionate, legally compliant, and aligned with local privacy and employment laws.
Common Types of Spyware
Spyware is not a single tool. It is a broad category that includes several different technologies and attack methods. Understanding the most common types can help you recognise the risks more quickly.
1. Tracking Cookies and Invasive Tracking Technology
Cookies are small files stored by websites in your browser. Many cookies are harmless and useful. For example, they can keep you logged in, remember your preferences, or help a website function properly.
However, some cookies and tracking scripts follow users across multiple websites to build detailed profiles of their online behaviour. While this is not always malware, invasive tracking can become a privacy concern, especially when users are not clearly informed or given control.
In some cases, shady advertising networks or malicious scripts can also be linked to more serious security risks.
Common signs include:
- Ads that seem unusually personal
- Retargeting that follows you across unrelated websites
- Browser activity being tracked by unknown third parties
- Privacy settings being ignored or reset
To reduce this risk, use browser privacy controls, block third-party cookies where practical, regularly clear site data, and avoid accepting unnecessary cookies on unfamiliar websites.
2. Adware
Adware is software that displays unwanted advertisements. Some adware is simply annoying, but more aggressive forms can behave like spyware by tracking browsing activity, redirecting searches, changing browser settings, or installing additional unwanted software.
Adware may arrive bundled with free downloads, browser extensions, fake media players, or software from unofficial websites.
Common signs include:
- Pop-ups appearing even when you are not browsing
- New tabs opening automatically
- Your homepage or search engine changing without permission
- Unwanted browser extensions returning after removal
- Slow browser performance
- Redirects to suspicious websites
Although adware may appear less serious than other spyware types, it should not be ignored. It can expose users to phishing pages, scam websites, fake support alerts, and further malware infections.
3. Keyloggers
A keylogger records what you type. This can include passwords, emails, chat messages, search queries, credit card numbers, and business login details.
Keyloggers are particularly dangerous because they can defeat weak password practices. If a user types a password on an infected device, the attacker may capture it immediately. Some keyloggers can also capture clipboard data, screenshots, browser forms, and application activity.
Common signs include:
- Accounts being compromised even after changing passwords
- Unexpected multi-factor authentication prompts
- Suspicious login alerts
- Password reset emails you did not request
- Security tools being disabled
- Sluggish device performance without a clear reason
If you suspect a keylogger, do not change passwords on the infected device. Use a known-clean device instead, such as a managed work computer verified by IT or a freshly updated personal device.
4. Trojans and Remote Access Trojans
A trojan is malware disguised as legitimate software. Users may install it believing it is a useful program, invoice, update, game, cracked application, or business document.
A remote access trojan, often called a RAT, gives an attacker remote control over the infected device. This can allow them to browse files, install other malware, activate cameras or microphones, steal data, or move further into a business network.
Common signs include:
- Unknown remote access tools installed
- Webcam or microphone indicators turning on unexpectedly
- New administrator accounts
- Unusual network traffic
- Files being moved, opened, or deleted unexpectedly
- Security warnings about remote connections
In businesses, remote access trojans can be especially serious because they may give attackers a foothold into the wider network.If you suspect a keylogger, do not change passwords on the infected device. Use a known-clean device instead, such as a managed work computer verified by IT or a freshly updated personal device.
5. Infostealers
Infostealers are a major modern spyware threat. They are designed to quickly collect valuable data such as browser-saved passwords, session cookies, cryptocurrency wallet details, authentication tokens, autofill data, and files from common folders.
Infostealers are often distributed through phishing emails, fake installers, cracked software, malicious ads, compromised websites, and unsafe browser extensions.
One of the biggest risks is session hijacking. Even if your password is strong, an attacker may steal a session cookie that allows them to access an account without logging in normally. This is why businesses should not rely on passwords alone.
Common signs include:
- Unusual logins from new devices or locations
- Business accounts accessed outside normal hours
- Cloud files being downloaded unexpectedly
- Suspicious email forwarding rules
- Browser profiles behaving strangely
- Login sessions staying active after password changes
6. Rootkits and Stealth Spyware
Rootkits are designed to hide malicious activity deep within a system. They may conceal files, processes, services, registry entries, or network connections. This makes some infections difficult to detect and remove while the operating system is running normally.
Rootkit-based spyware may survive basic scans and appear to return after removal. In these cases, offline scanning or professional incident response may be required.
Common signs include:
- Malware returning after being removed
- Security software failing to start
- System tools giving inconsistent results
- Unexplained administrator-level changes
- Severe performance issues
- Suspicious activity that does not appear in normal app lists
7. Mobile Spyware and Stalkerware
Mobile spyware may monitor calls, messages, photos, app activity, location, browsing, and microphone or camera use. Stalkerware is a particularly concerning form of spyware that may be installed by someone known to the victim, such as a partner, family member, or acquaintance, to secretly monitor them.
Common mobile warning signs include:
- Sudden battery drain
- Overheating
- Unexpected data usage
- Unknown apps
- Strange permissions granted to apps
- Device settings changing without explanation
- Location sharing you did not enable
- Unusual behaviour after someone else had access to your phone
If you suspect stalkerware and personal safety is a concern, do not rush to remove it without a safety plan. The person monitoring the device may be alerted. Use a safe device to seek specialist support.
How Does Spyware Get Installed?
Phishing Emails
Phishing emails often contain malicious links or attachments. They may appear to come from banks, delivery companies, suppliers, colleagues, government agencies, or well-known brands.
A user may be asked to open an invoice, download a file, update account details, or click a login link. Once they do, spyware may be installed or credentials may be stolen.
Fake Software Updates
Pop-ups claiming that your browser, antivirus, PDF reader, or media player is out of date can be used to deliver spyware. Real updates should come from official app stores, vendor websites, or managed business update systems.
Bundled Free Software
Some free programs include unwanted extras such as toolbars, adware, tracking components, or browser hijackers. This risk is higher when software is downloaded from unofficial websites.
Cracked or Pirated Software
Cracked software is a common delivery method for spyware and infostealers. Businesses should strictly avoid pirated software because it creates serious legal, operational, and cybersecurity risks.
Malicious Browser Extensions
Browser extensions can access browsing data, modify pages, read form entries, and redirect searches. A malicious extension can become a powerful spyware tool.Phishing emails often contain malicious links or attachments. They may appear to come from banks, delivery companies, suppliers, colleagues, government agencies, or well-known brands.
A user may be asked to open an invoice, download a file, update account details, or click a login link. Once they do, spyware may be installed or credentials may be stolen.
Compromised Websites and Malvertising
Attackers may compromise legitimate websites or use malicious ads to redirect users to harmful pages. This can lead to fake downloads, scam alerts, or exploit attempts.
Phishing Emails
Phishing emails often contain malicious links or attachments. They may appear to come from banks, delivery companies, suppliers, colleagues, government agencies, or well-known brands.
A user may be asked to open an invoice, download a file, update account details, or click a login link. Once they do, spyware may be installed or credentials may be stolen.
Weak Passwords and Credential Reuse
Unpatched Software
Outdated browsers, operating systems, plugins, and mobile apps may contain vulnerabilities that attackers can exploit. Regular updates reduce the risk.
Warning Signs of a Spyware Infection
Spyware is designed to be quiet, so it is not always obvious. However, there are several warning signs that should raise concern.
Device Warning Signs
Your device may be infected if you notice:
- Sudden slow performance
- Frequent crashes or freezes
- Random restarts
- Storage space disappearing
- Unknown apps or services
- Security software disabled
- Antivirus updates failing
- Unusual background activity
- Fans running constantly
- Unexpected error messages
Browser Warning Signs
Your browser may show spyware-related symptoms such as:
- Pop-ups that keep appearing
- Homepage changes you did not make
- Search engine changes
- New toolbars or extensions
- Redirects to unknown websites
- Unusual ads on normal websites
- Browser settings resetting after you change them
Account Warning Signs
Account-level symptoms are often more serious than device symptoms. Watch for:
- Password reset emails you did not request
- Multi-factor authentication prompts you did not initiate
- New login alerts from unfamiliar locations
- Emails sent from your account that you did not send
- Unknown forwarding rules in your mailbox
- Files shared from your cloud storage without permission
- New users added to business platforms
Mobile Warning Signs
On phones and tablets, look for:
- Battery draining unusually fast
- Device overheating
- Unexpected data usage
- Unknown apps
- Apps with excessive permissions
- Strange text messages or notifications
- Location services turning on unexpectedly
- Device admin settings you did not enable
One warning sign alone does not always prove spyware is present. However, several signs together should be taken seriously.
What to Do Before Removing Spyware
Before you begin removal, take a few careful steps. This helps limit damage and protects important evidence, especially in a business environment.
1. Disconnect From the Internet
If possible, disconnect the device from Wi-Fi, Ethernet, or mobile data. This may reduce the attacker’s ability to receive more data or control the device remotely.
2. Stop Entering Passwords
Do not log into banking, email, business systems, or password managers from the suspected device. If spyware includes a keylogger or infostealer, anything you type may be captured.
Use a known-clean device to change passwords and check important accounts.
3. Record What You See
Take photos or screenshots of warning messages, pop-ups, strange apps, suspicious emails, or login alerts. Note the date, time, and what happened.
This can help IT support or cybersecurity professionals understand the issue.
4. Tell Your IT Team
If the affected device belongs to a business, report it immediately. Do not try to quietly fix it yourself. A single infected device may indicate a wider security incident.
Your IT team may need to preserve logs, isolate the device, check other systems, reset credentials, and investigate whether business data was accessed.
How to Remove Spyware From Windows
Windows devices are common spyware targets, especially in business environments. Follow these steps carefully.
Step 1: Disconnect the Device
Step 2: Start With a Security Scan
Run a full scan using a reputable antivirus or endpoint detection tool. If this is a business device, use the company-approved security platform.
Make sure the tool is updated before scanning, if safe to do so.
Step 3: Remove Suspicious Apps
Go to your installed apps list and look for programs you do not recognise. Pay attention to recently installed apps, toolbars, remote access tools, download managers, or programs with strange names.
Remove anything suspicious, but avoid deleting business software unless you are sure or have checked with IT.
Step 4: Check Browser Extensions
Open each browser and review installed extensions. Remove anything you do not recognise or no longer use.
Also reset your homepage, search engine, and startup page if they were changed.
Step 5: Review Startup Items
Spyware often tries to launch automatically when the device starts. Review startup apps and disable anything suspicious.
Business users should ask IT to check scheduled tasks, services, local administrator accounts, and persistence mechanisms.
Step 6: Run an Offline Scan
If malware keeps returning or you suspect a rootkit, run an offline scan. Microsoft Defender Offline can scan outside the normal Windows environment, which can help detect stubborn threats.
Step 7: Change Passwords From a Clean Device
After removal, use a trusted device to change passwords for important accounts. Start with email, banking, Microsoft 365 or Google Workspace, cloud storage, accounting software, and administrator accounts.
Enable multi-factor authentication wherever possible.
Step 8: Monitor for Further Activity
How to Remove Spyware From macOS
Macs are not immune to spyware. While macOS includes strong built-in protections, malicious profiles, browser extensions, fake apps, and infostealers can still cause serious issues.
Step 1: Update macOS
Install the latest macOS updates and security patches. Updates often fix vulnerabilities that malware can exploit.
Step 2: Remove Unknown Applications
Check the Applications folder for software you do not recognise. Remove suspicious apps, especially those installed recently or downloaded outside the App Store or trusted vendor websites.
Step 3: Check Login Items
Review login items and background items. Remove anything unfamiliar.
Step 4: Review Browser Extensions
Check Safari, Chrome, Edge, and Firefox extensions. Remove anything suspicious or unnecessary.
Step 5: Check Profiles
Some spyware or adware installs configuration profiles to control browser or system settings. Review system profiles and remove unknown profiles if safe to do so.
Step 6: Run a Trusted Security Scan
Use reputable Mac security software to scan for malware, adware, and unwanted programs.
Step 7: Reset Passwords
Use a clean device to change key passwords and enable multi-factor authentication.
How to Remove Spyware From iPhone or iPad
Apple devices have strong security controls, but spyware risks still exist, especially through malicious profiles, compromised accounts, unsafe links, or physical access.
Step 1: Update iOS or iPadOS
Install the latest updates. Security patches are essential.
Step 2: Review Installed Apps
Delete apps you do not recognise or no longer use.
Step 3: Check App Permissions
Review permissions for location, microphone, camera, contacts, photos, Bluetooth, and background activity. Revoke permissions that are not needed.
Step 4: Check Profiles and Device Management
Step 5: Review Apple ID Security
Check trusted devices, account recovery details, and recent sign-ins. Change your Apple ID password from a clean device if you suspect compromise.
Step 6: Consider a Factory Reset
If you strongly suspect spyware and cannot identify the cause, back up essential data carefully and consider a factory reset. Avoid restoring from a backup that may reintroduce the issue.
How to Remove Spyware From Android
Android devices vary by manufacturer, but the following steps are useful for most users.
Step 1: Update Android and Apps
Install system updates and update apps through the official Google Play Store.
Step 2: Remove Unknown Apps
Delete apps you do not recognise, especially those installed outside the Play Store.
Step 3: Review App Permissions
Check which apps can access location, SMS, camera, microphone, accessibility services, notification access, and device admin settings. Remove excessive permissions.
Step 4: Use Safe Mode
Step 5: Run a Security Scan
Use a trusted mobile security app or built-in protection features to scan the device.
Step 6: Reset Important Passwords
Use a clean device to change important passwords and enable multi-factor authentication.
Step 7: Factory Reset if Needed
If spyware remains or you suspect stalkerware, a factory reset may be required. In personal safety situations, seek specialist advice before taking action.
What Businesses Should Do After a Spyware Infection
For businesses, spyware should be treated as a security incident, not just a device problem.
Important response steps include:
- Isolate the affected device
- Preserve relevant logs
- Identify which accounts were used on the device
- Reset passwords and revoke active sessions
- Review email forwarding rules
- Check cloud storage activity
- Investigate unusual logins
- Scan other devices
- Review endpoint detection alerts
- Notify affected parties if required
- Document the incident
- Improve controls to prevent recurrence
A spyware infection may indicate a larger issue such as phishing, weak passwords, poor patching, lack of endpoint protection, or insufficient employee training.
How to Prevent Spyware
Prevention is much easier and cheaper than recovery. Use the following steps to reduce your risk.
Keep Devices Updated
Install updates for operating systems, browsers, business software, mobile apps, and security tools. Updates close known vulnerabilities.
Use Reputable Security Software
Avoid Untrusted Downloads
Only download software from official vendor websites, trusted app stores, or approved business portals.
Be Careful With Email Links and Attachments
Do not open unexpected attachments or click suspicious links. Verify unusual requests through a separate trusted channel.
Use Multi-Factor Authentication
Multi-factor authentication makes it harder for attackers to access accounts even if they steal a password.
Use a Password Manager
A password manager helps create and store strong, unique passwords for each account. This reduces the damage caused by credential theft or password reuse.
Limit Admin Access
Users should not have administrator rights unless they need them. Restricting admin access can limit what spyware can install or change.
Review Browser Extensions
Only keep extensions that are trusted, necessary, and regularly updated.
Back Up Important Data
Maintain secure, tested backups. Backups are not just for ransomware; they also help recover from malware-related damage.
Train Employees
Human error is one of the most common causes of spyware infections. Cybersecurity awareness training helps staff recognise phishing emails, fake updates, suspicious downloads, and social engineering tactics.
Monitor Business Accounts
Use alerts for suspicious logins, impossible travel, mass downloads, email forwarding rules, and administrator changes.
When Should You Get Professional Help?
You should contact IT support or a cybersecurity specialist if:
- Spyware keeps returning after removal
- A business device is infected
- Administrator accounts may be compromised
- Sensitive customer or financial data may be exposed
- You suspect a rootkit or remote access trojan
- Email or cloud accounts show suspicious activity
- You are unsure whether removal was successful
- Scan other devices
- Review endpoint detection alerts
- Notify affected parties if required
- Document the incident
- Improve controls to prevent recurrence
Professional support can help identify the source of infection, remove spyware safely, check for wider compromise, and strengthen your defences.
Final Thoughts
Spyware is a serious privacy and security threat. It can steal passwords, monitor activity, expose business data, and give attackers access to sensitive systems. Because spyware is designed to hide, it is important to act quickly when warning signs appear.
Disconnect suspicious devices, avoid entering passwords, run trusted security scans, remove unknown apps and extensions, reset passwords from a clean device, and monitor accounts for further activity.
For businesses, spyware removal should be part of a wider incident response process. The goal is not only to clean the infected device but also to understand how the spyware got in, what data may have been accessed, and how to prevent it from happening again.
If you are concerned that your device or business network may be infected with spyware, professional cybersecurity support can help you investigate, remove the threat, and protect your systems from future attacks.
Jargon Buster
Pop-up ads – A form of online advertising where a small window suddenly appears or pops up.
Safe mode – It is a diagnostic mode that starts Windows in a basic state, usually used to fix critical problems and remove malicious software.
Blake Parry
FAQ
What is spyware?
How do I know if my device has spyware?
Can spyware steal my passwords?
Yes. Some spyware, such as keyloggers and infostealers, can capture passwords as you type them or steal saved login details from your browser or device.
How can I remove spyware from my computer?
Disconnect from the internet, run a trusted antivirus or endpoint security scan, remove suspicious apps and browser extensions, reset your browser settings, and change passwords from a clean device.
Can phones get spyware too?
Yes. iPhones and Android phones can be affected by mobile spyware or stalkerware. Warning signs include overheating, sudden battery drain, unexpected data usage, unknown apps, or unusual permissions.
