Ransomware is one of the most damaging forms of cyber attack. It can lock files, stop systems from working, interrupt services and put sensitive data at risk. For individuals, it may mean losing access to personal documents, photos or financial records. For organisations, it can mean business disruption, reputational damage, recovery costs and serious pressure on staff and customers.
So, how can you prevent ransomware? The safest answer is not one single tool or one quick fix. Ransomware prevention depends on layers of defence. You need reliable backups, strong access control, secure authentication, updated systems, endpoint protection, safer email habits, careful web use and a clear security culture.
Ransomware is a type of malware. Malware is the wider term for malicious software, including viruses, worms, trojans, spyware and ransomware. Ransomware is especially harmful because it is designed to deny access to data or systems, usually by encrypting files. Attackers may then demand payment. In some modern incidents, attackers may also steal data before locking systems, creating both operational and data protection risks.
Many people search for “how can you avoid ransomware attacks?” or “how can you stop ransomware?” because the impact can be severe. However, the goal should not only be stopping an attack at the last moment. The better approach is to make your systems harder to break into, limit what attackers can reach, and make recovery possible without relying on criminals.
This guide explains practical ways to prevent ransomware attacks and reduce the risk of malware invading your system. It is written for beginners, employees, small businesses, training providers and organisations that want clear, realistic cyber security advice.
Data Backups (Your Ultimate Safety Net)
Backups are your ultimate safety net against ransomware. They do not stop ransomware from entering a system, but they can stop an incident from becoming a disaster.
Ransomware works by making files or systems unavailable. If you do not have clean, usable backups, recovery becomes much harder. You may face long downtime, permanent data loss or pressure to consider paying a ransom. A reliable backup gives you another option: restore your data and rebuild safely.
However, not all backups are equally useful. A backup that is connected to the same infected network may also be encrypted. A backup that has never been tested may fail during recovery. A backup that only covers some files may leave important systems missing.
Good backups should be regular, protected, separate and tested.
| Backup feature | Why it matters |
| Regular | Reduces the amount of data you lose |
| Offline or separate | Helps protect backups from ransomware |
| Protected | Stops attackers from deleting or altering backups |
| Tested | Confirms that recovery actually works |
| Prioritised | Focuses on the files and systems the organisation needs most |
For individuals, backups may include documents, photos, study materials, financial files and personal records. For organisations, backups may include customer data, learner records, finance files, HR documents, course materials, websites, databases and business systems.
A backup plan should answer three simple questions: what needs to be backed up, how often it needs to be backed up, and how quickly it must be restored after an incident.
Keep offline backups
Offline backups are one of the strongest protections against ransomware. An offline backup is not continuously connected to the live system. Because it is separated, ransomware has less chance of reaching it during an attack.
This matters because attackers often look for backups before launching ransomware. If they can delete or encrypt backups, they increase pressure on the victim. That is why a backup should not simply be another folder on the same computer or a drive that is always connected.
Offline backup options may include external drives that are disconnected after backup, secure offline storage, or backup systems designed to prevent unauthorised alteration or deletion. Some organisations use a combination of offline, cloud and protected backup systems.
For small businesses, a practical rule is to avoid having all backups online at the same time. At least one recent backup should be separated from the live environment. If ransomware affects your main systems, the offline backup should remain safe.
Backup accounts also need protection. If attackers compromise an administrator account that controls backups, they may delete or damage backup copies. Use separate credentials for backup systems, protect them with multi-factor authentication and limit who can change or delete backups.
For personal users, an external drive can be useful, but it should not stay plugged in all the time. Connect it to back up files, then disconnect it and store it safely.
Test recovery
A backup is only useful if it can be restored. Testing recovery means checking that your backup works before an emergency happens.
Many organisations discover too late that their backups are incomplete, corrupted, outdated or too slow to restore. Ransomware incidents are stressful. That is not the time to find out that your recovery process has never been tested.
Testing does not always need to be complicated. It may involve restoring a sample of files, checking a database recovery process, confirming that cloud backups can be accessed, or running a planned recovery exercise.
A useful recovery test should check:
| Recovery question | Why it matters |
| Can we access the backup? | Locked or forgotten credentials can delay recovery |
| Is the backup clean? | Restoring infected data can restart the problem |
| Is the data complete? | Missing files can disrupt operations |
| How long does recovery take? | Downtime affects customers and staff |
| Who is responsible? | Clear roles prevent confusion |
| What is restored first? | Critical systems should be prioritised |
For businesses, recovery priorities should be agreed in advance. For example, a training provider may need to restore its learning platform, learner records, email systems and payment records before less urgent files.
Testing recovery also helps identify gaps. You may realise that important data is not being backed up, that backup schedules are too infrequent, or that only one person knows how to restore systems.
Access Control & Authentication
Ransomware often spreads because attackers gain access to accounts with too much permission. Once inside, they may move through systems, search for valuable data, disable security tools and reach shared files or backups.
Access control and authentication help reduce this risk. Access control decides who can reach which systems and files. Authentication proves that a user is who they claim to be.
Strong access control does not mean making work impossible. It means giving people the access they need, protecting important accounts and reducing unnecessary exposure.
Multi-Factor Authentication (MFA)
Multi-factor authentication, or MFA, adds an extra layer of protection to accounts. Instead of relying only on a password, MFA requires another form of verification. This may be an authentication app, security key, passkey, approval prompt or other approved method.
MFA is important because passwords can be stolen. Attackers may steal passwords through phishing, data breaches, malware, weak passwords or password reuse. If an account has MFA, a stolen password alone may not be enough to log in.
MFA should be used especially for:
| Account type | Why MFA matters |
| Email accounts | Email can reset many other passwords |
| Administrator accounts | Admin access can control systems and security settings |
| Remote access | Attackers often target remote entry points |
| Cloud services | Cloud accounts may hold large amounts of data |
| Backup systems | Attackers may try to delete or encrypt backups |
| Finance systems | Compromise can lead to fraud or disruption |
For organisations, MFA should be a priority for admin accounts and remote access. These are high-value targets. If attackers gain control of them, they may move quickly across systems.
MFA is not perfect. Attackers may still try to trick users into approving login prompts or use more advanced methods. However, MFA greatly improves protection compared with password-only access.
Users should also be trained not to approve unexpected MFA prompts. If you receive a login approval request when you are not trying to sign in, treat it as suspicious and report it.
Principle of Least Privilege
The principle of least privilege means users should only have the access they need to do their job, and no more.
This is one of the most important ways to limit ransomware damage. If a normal user account has access to every shared folder, ransomware running under that account may affect a large amount of data. If the account has limited access, the damage may be contained.
For example, a receptionist may need access to booking records but not payroll files. A course tutor may need access to learner materials but not finance systems. A marketing employee may need website content access but not administrator control over the whole network.
Least privilege should apply to:
| Area | Good practice |
| User accounts | Give role-based access only |
| Administrator accounts | Use only when necessary |
| Shared folders | Avoid giving everyone full control |
| Cloud systems | Review permissions regularly |
| Backup systems | Restrict change and delete rights |
| Former staff | Remove access quickly after leaving |
| Contractors | Give temporary access where possible |
Administrator accounts require special care. Staff should not use admin accounts for everyday tasks such as browsing the web or checking email. If an admin account is compromised, ransomware can cause much wider damage.
Organisations should review permissions regularly. People change roles, projects end and staff leave. Old access rights can create hidden risk.
Least privilege also supports faster recovery. If an incident affects one account or department, limited access may stop it spreading across the whole organisation.
Software & Network Security
Ransomware prevention also depends on secure systems and networks. Attackers often look for outdated software, exposed remote access, weak configurations and poorly protected devices.
Software and network security should reduce the number of ways malware can enter, move and cause damage.
Patch systems promptly
Patching means applying updates that fix bugs and security weaknesses. Prompt patching is one of the most effective ways to prevent malware attacks.
Many ransomware incidents exploit known vulnerabilities. Once a weakness is publicly known, attackers may scan for systems that have not been updated. Organisations that delay patches can become easier targets.
Patch management should cover:
| System area | Examples |
| Operating systems | Windows, macOS, Linux, servers |
| Browsers | Chrome, Edge, Safari, Firefox |
| Office software | Word processors, spreadsheets, email tools |
| Business applications | CRM, LMS, HR, finance and booking systems |
| Security tools | Endpoint protection and antivirus |
| Network devices | Routers, firewalls, VPNs and switches |
| Plugins and extensions | Browser add-ons and software plugins |
For individuals, the best approach is to turn on automatic updates where possible. This helps keep phones, computers, browsers and apps protected.
For organisations, updates need a more structured process. Critical patches should be prioritised. Unsupported systems should be replaced or isolated. IT teams should know which devices and applications are in use so that nothing is forgotten.
Patching also helps prevent ransomware from spreading. Even if one device is infected, updated systems may be harder for malware to exploit.
Delaying updates may feel convenient, but it creates avoidable risk. A short restart is usually easier than recovering from a ransomware incident.
Endpoint Protection
Endpoint protection helps protect devices such as laptops, desktops, servers, tablets and sometimes mobile devices. These devices are called endpoints because they are points where users access systems and data.
Traditional antivirus is part of endpoint protection, but modern endpoint protection often goes further. It may include anti-malware scanning, behaviour monitoring, threat detection, device control, ransomware protection and centralised alerts.
Endpoint protection can help detect suspicious behaviour such as:
| Suspicious behaviour | Why it matters |
| Many files changing quickly | Possible ransomware encryption |
| Security tools being disabled | Malware may be trying to hide |
| Unknown programmes running | A suspicious process may be active |
| Unusual network connections | Malware may be communicating externally |
| Attempts to access many folders | Possible lateral movement or data theft |
| Unexpected script activity | Malware may be using automation |
For businesses, endpoint protection should be monitored. Installing software is not enough if nobody reviews alerts. Security warnings need a response process.
For individuals, built-in protection may provide a good basic layer, but it should be kept active and updated. Users should avoid turning protection off to install unknown software or open suspicious files.
Network security is also important. Firewalls, secure Wi-Fi, controlled remote access and network segmentation can all reduce ransomware risk. Network segmentation means separating systems so that an infection in one area cannot easily reach everything else.
For example, guest Wi-Fi should not have access to internal business systems. Finance systems, backup systems and learning platforms should not be exposed unnecessarily. Remote access should be protected with MFA and strong configuration.
Email & Web Vigilance
Email and web activity remain major routes for ransomware and malware. Attackers know that people use email, websites, attachments and online tools constantly. They design messages and pages that look normal enough to earn a click.
This is why technical protection must be supported by safer behaviour.
Beware of phishing
Phishing is one of the most common ways attackers deliver malware or steal login details. A phishing message tries to trick the user into clicking a link, opening an attachment, entering a password, approving a payment or downloading a file.
Phishing may arrive by email, text message, social media, phone call or workplace messaging platform. It may look like it comes from a delivery company, bank, manager, supplier, customer, colleague, cloud provider or government service.
Common phishing themes include:
| Phishing theme | What it tries to make you do |
| Fake invoice | Open an attachment or pay quickly |
| Delivery notice | Click a tracking link |
| Account warning | Enter login details |
| Password expiry | Visit a fake login page |
| Job or CV email | Open a malicious document |
| Manager request | Act urgently without checking |
| Security alert | Download a fake “fix” |
Ransomware may enter through a malicious attachment or link. In some cases, phishing first steals login details. Attackers then use those details to access systems and prepare a ransomware attack.
The best defence is not simply telling people “don’t click bad links”. Phishing can be convincing. Organisations should combine staff awareness with technical controls such as email filtering, safe attachment handling, reporting tools, MFA and monitoring.
Users should slow down when a message is unexpected, urgent or unusual. Check the sender’s address, the link destination and the request. If money, passwords, personal data or file downloads are involved, verify through a trusted route.
In a workplace, suspicious emails should be reported quickly. Reporting helps protect others and allows security teams to block similar messages.
Avoid macros and How can you prevent ransomware
Macros are small scripts used in documents and spreadsheets to automate tasks. They can be useful in legitimate business processes, but they can also be abused by attackers.
A common tactic is to send a document that asks the user to “enable content” or “enable macros”. The message may claim the document is protected, encrypted, incomplete or only viewable if macros are enabled. If the user agrees, the macro may run malicious commands.
Macros have been used to deliver malware, including ransomware-related threats. This is why organisations should control when macros are allowed.
Safer macro practices include:
| Practice | Why it helps |
| Disable macros by default | Stops many malicious documents running |
| Allow only trusted macros | Reduces unnecessary exposure |
| Use protected view | Limits what unknown documents can do |
| Train users on macro warnings | Prevents unsafe approval |
| Block macros from the internet where possible | Reduces common attack routes |
| Review business need | Removes outdated macro dependence |
Individuals should be cautious with any document that asks them to enable macros unexpectedly. If you receive a file by email and it asks for macros, stop and verify it.
Organisations should identify where macros are genuinely needed and where they can be removed. Many teams use old macro-based files out of habit. Replacing them with safer workflows can reduce risk.
Best Practices
Ransomware prevention works best when it is treated as an ongoing practice, not a one-time IT task. Technology helps, but people, processes and leadership matter too.
The best approach combines prevention, detection, response and recovery.
Prevention reduces the chance of ransomware entering the system. Detection helps identify suspicious activity early. Response limits damage when something happens. Recovery restores systems and data safely.
Useful best practices include:
| Best practice | Purpose |
| Maintain offline backups | Supports recovery without relying on attackers |
| Use MFA | Protects accounts from password-only compromise |
| Apply least privilege | Limits ransomware spread |
| Patch promptly | Closes known security weaknesses |
| Use endpoint protection | Detects and blocks suspicious activity |
| Train staff | Reduces phishing and unsafe behaviour |
| Control macros | Blocks a common malware route |
| Secure remote access | Reduces exposed entry points |
| Monitor alerts | Helps detect attacks earlier |
| Practise incident response | Improves recovery under pressure |
A ransomware plan should also cover what to do if an attack is suspected. Staff should know who to contact, what systems to disconnect, what not to delete, and how to preserve useful information for investigation.
Organisations should also think about suppliers. Many businesses rely on cloud platforms, payment systems, learning platforms, IT providers or software vendors. Supplier weaknesses can affect your own operations. Contracts and security reviews should consider backup, access control, incident response and data protection responsibilities.
For small businesses, the basics are still powerful. Keep backups. Turn on MFA. Patch systems. Train staff. Use endpoint protection. Control access. Avoid suspicious attachments. These actions reduce risk significantly.
Zero Trust Model
The Zero Trust Model is a security approach based on a simple idea: never automatically trust a user, device or system just because it is inside the network. Always verify, limit access and monitor behaviour.
Traditional security often assumed that anything inside the organisation’s network was trusted. That approach is risky today because users work remotely, cloud services are common, devices move between networks and attackers may already have stolen valid credentials.
Zero Trust does not mean trusting nobody in a personal sense. It means systems should not give broad access automatically. Every request should be assessed based on identity, device health, permissions, location, behaviour and risk.
Core Zero Trust ideas include:
| Zero Trust principle | Meaning |
| Verify explicitly | Check identity and context before granting access |
| Use least privilege | Give only the access needed |
| Assume breach | Design systems as if attackers may already be inside |
| Segment systems | Prevent one compromise from reaching everything |
| Monitor continuously | Look for unusual behaviour |
| Protect high-value assets | Add extra controls around critical data and systems |
Zero Trust helps prevent ransomware because it limits movement. If attackers compromise one account or device, they should not automatically gain access to the whole network.
For example, a compromised staff account should not be able to access backup systems, finance files, administrator tools and every shared folder. A Zero Trust approach would require stronger verification and tighter permissions.
Small organisations do not need to implement a complex Zero Trust programme overnight. They can start with practical steps: enable MFA, reduce admin rights, review access, separate important systems, monitor unusual activity and remove old accounts.
Zero Trust is not a product you buy once. It is a way of designing safer access.
How Can You Stop Ransomware If an Attack Starts?
Prevention is the priority, but organisations should also know what to do if ransomware is suspected.
If a device suddenly shows ransom messages, files become encrypted, systems slow down badly or many files are being renamed, act quickly.
The first step is containment. Disconnect affected devices from the network if safe to do so. Do not connect backup drives to infected systems. Do not restart or wipe systems without guidance if an investigation may be needed.
Report the incident internally. Staff should contact IT, management or the designated incident response person immediately. In larger organisations, the cyber incident response plan should be activated.
Next, identify what has been affected. Check whether the issue is limited to one device, one account, one shared folder or a wider network. Security teams may need to review logs, alerts and file activity.
Passwords and credentials may need to be reset, especially administrator accounts and accounts used on affected systems. However, this should be done carefully so that recovery access is not accidentally lost.
Before restoring from backup, make sure the backup is clean. Restoring infected files can bring the problem back.
For organisations, ransomware may also create reporting duties if personal data has been affected. Cyber crime reporting, insurer notification, legal advice and regulator assessment may be needed depending on the situation.
Individuals should avoid paying quickly or downloading random “decryption” tools from unknown websites. Some may be scams or malware. Use trusted support and official guidance.
Final Thoughts
Ransomware prevention depends on layered defence. No single measure is enough on its own.
Data backups are your ultimate safety net. Keep offline backups and test recovery so you know you can restore important files and systems. Use access control and authentication to reduce the chance of account compromise. Enable multi-factor authentication and apply the principle of least privilege so attackers cannot easily move everywhere.
Strengthen software and network security by patching systems promptly and using endpoint protection. Stay alert to email and web risks by watching for phishing and avoiding unnecessary macros. Build best practices around monitoring, staff awareness, incident response and the Zero Trust Model.
The most effective way to avoid ransomware attacks is to make your environment harder to enter, harder to move through and easier to recover. For individuals, this protects personal files and accounts. For organisations, it protects operations, customers, learners, employees and reputation.
Ransomware is serious, but it is not unbeatable. With offline backups, tested recovery, MFA, least privilege, updates, endpoint protection, phishing awareness and safer access controls, you can greatly reduce the risk and improve your ability to recover if an incident happens.