What Is Ransomware?

Ransomware is a type of malware that encrypts a victim's files or systems, blocking access, and then demands payment — typically in cryptocurrency — in exchange for the decryption key.

Ransomware attacks today target not just large organizations, but small and medium-sized businesses, hospitals, schools, and even individuals. A single attack can halt all operations within hours and trigger weeks of recovery work.

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How Does Ransomware Work?

A typical ransomware attack moves through these stages:

1. Initial access: The attacker enters the system via a phishing email, a security vulnerability, weak RDP access, or a malicious download.
2. Propagation: The malware attempts to spread across the network to other systems, shared folders, and backups.
3. Encryption: Files are encrypted and become inaccessible.
4. Ransom note: A note is left on screen or within the file system, containing payment instructions and a deadline.
5. Pressure: Threats are made to publish stolen data or increase the ransom if payment isn't made in time.

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Types of Ransomware

Crypto Ransomware

Encrypts files while leaving the system accessible — but the data becomes unusable. The most common type.

Locker Ransomware

Locks access to the entire system or screen. Files are not encrypted, but the device is rendered unusable.

Double Extortion

Both encrypts files and exfiltrates data. If the ransom is not paid, the attacker threatens to publish the stolen data publicly.

Ransomware as a Service (RaaS)

A model where ransomware is offered as a ready-to-use toolkit. Even non-technical criminals can rent these tools and launch attacks.

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How Does Ransomware Spread?

• Phishing emails: Messages containing malicious attachments or links
• Unpatched vulnerabilities: Outdated operating systems or software
• Weak RDP: Remote desktop access exposed directly to the internet
• Untrusted downloads: Cracks, keygens, or fake software
• USB drives and external devices: Infection via compromised media
• Supply chain: Spreading through third-party software updates

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How to Protect Against Ransomware

Backups

The most critical defense. Backups should be taken regularly, stored in a separate environment, and tested for restorability. Immutable backups — which cannot be altered or deleted — are the preferred approach against ransomware.

Patch Management

Operating systems, applications, and network devices must be kept up to date. Unpatched systems are open doors for attackers.

Email Security

Phishing filtering, attachment scanning, and blocking of suspicious links are essential baseline measures.

Endpoint Protection

Endpoint security solutions can detect and block ransomware behavior before it causes damage.

Network Segmentation

When systems are isolated from one another, ransomware propagation slows down or stops entirely.

Least Privilege

Limiting users to only the resources they need reduces the blast radius of an attack.

Employee Training

Employees who can recognize phishing emails and report suspicious situations form the first line of defense.

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What to Do If You're Hit by Ransomware

• Immediately isolate affected systems from the network
• Do not pay the ransom — payment doesn't guarantee data recovery and encourages future attacks
• Contact your IT team or managed security provider
• Activate your backup and recovery plan
• Document the incident and assess whether notification to authorities or affected parties is required
• Identify and close the entry point used by the attacker

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Conclusion

Ransomware is one of the most destructive cyber threats of our time. Once an attack occurs, options become very limited — which is why preventive measures are always more valuable than incident response.

Regular backups, up-to-date systems, employee awareness, and the right security tools working together can significantly reduce ransomware risk.

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This article was prepared by Lasetech.