Ransomware Explained: How Attacks Work and How to Protect Your Data

Ransomware is one of the most disruptive forms of cybercrime because a successful attack can do far more than lock files. Modern campaigns may steal sensitive information, disable business systems, expose customer records, interrupt healthcare or public services and pressure victims with threats to publish stolen data. Encryption remains important, but it is no longer the whole story.

The scale of the problem remains serious. Verizon’s 2026 Data Breach Investigations Report says ransomware was involved in 48% of breaches in its dataset, up from 44% a year earlier. At the same time, 69% of victims in Verizon’s ransomware dataset did not pay, and the median reported payment fell to $139,875.

The FBI’s 2025 Internet Crime Complaint Center report recorded more than 3,600 ransomware complaints and more than $32 million in directly reported losses. The FBI explicitly warns that this figure understates the real financial impact because it generally does not include lost business, downtime, wages, equipment or third-party remediation, and many incidents are reported through channels other than IC3.

That is why the threat should be understood as an operational and data-security crisis rather than merely a malware infection.

This guide explains how attacks begin, what happens after criminals gain access, how encryption and data extortion work, why ransomware-as-a-service has expanded the criminal ecosystem, what victims should do and which defenses provide the greatest practical protection.

For the broader framework, start with The News Ink’s Cybersecurity guide, which explains how ransomware fits alongside phishing, malware, stolen credentials, cloud risks and other cyber threats.

What Is Ransomware?

Ransomware is malicious activity designed to deny victims access to systems or data, steal information for extortion, or combine both tactics while demanding payment.

CISA describes the classic form as malware that encrypts files and makes the systems relying on them unusable. Criminals then demand money in exchange for decryption. Modern attackers may also steal information before encryption and threaten to publish it if the victim refuses to pay. CISA calls the combined use of encryption and data-leak pressure double extortion in its StopRansomware guidance.

Some campaigns now skip encryption completely.

Attackers gain access, steal sensitive data and demand payment solely to prevent publication.

This shift matters because it changes the defensive question.

Years ago, organizations could focus heavily on whether they had good backups.

Backups remain essential, but a backup cannot make stolen customer information secret again.

Modern defense therefore has to protect both:

• Availability, so systems can be restored.
• Confidentiality, so attackers cannot steal valuable information in the first place.

How a Ransomware Attack Works

Most incidents do not begin with a screen suddenly displaying a ransom note.

The visible encryption stage may occur only after attackers have spent hours, days or even longer inside the environment.

A simplified attack chain can look like this:

Stage	What the Attacker Tries to Do
Initial access	Enter through a vulnerability, stolen account or phishing
Establish control	Maintain access and avoid detection
Discovery	Identify systems, users, servers and valuable data
Privilege escalation	Obtain more powerful permissions
Lateral movement	Move from one system to another
Data theft	Exfiltrate sensitive information
Disable defenses	Interfere with security and recovery systems
Encryption	Make files or systems unavailable
Extortion	Demand payment and threaten additional harm

Not every campaign follows every stage.

Some criminals purchase initial access from another criminal group. Others move extremely quickly after exploiting a vulnerable internet-facing system.

The key lesson is that the ransom note often represents the end of the intrusion, not the beginning.

How Attackers Get In

Understanding initial access is one of the most important parts of prevention.

Exploiting Software Vulnerabilities

The threat has shifted significantly toward exposed software.

Verizon’s 2026 DBIR says 31% of breaches overall began with vulnerability exploitation, surpassing stolen credentials as the leading initial vector in its dataset.

Attackers scan the internet for vulnerable:

• VPN appliances
• firewalls
• remote-access systems
• web applications
• file-transfer software
• servers

Once a serious vulnerability becomes publicly known, criminal groups may begin exploiting exposed systems quickly.

Organizations therefore need accurate asset inventories and rapid patching for internet-facing systems.

Installing every update eventually is not enough.

The important question is whether the most dangerous exposed vulnerabilities are fixed before attackers exploit them.

Stolen Credentials

A criminal may not need to exploit software if valid credentials are already available.

Passwords can be obtained through:

• phishing
• information-stealing malware
• credential leaks
• password reuse
• dark-web marketplaces

An attacker using a valid account may initially appear to be an ordinary user.

That is why identity protection is a major part of the defense.

The News Ink’s guide to multi-factor authentication and account security explains why important accounts should not depend on a password alone.

Phishing and Social Engineering

Phishing remains another major route into organizations.

A victim may receive a fake invoice, login alert, document-sharing notification or urgent request containing a malicious link or attachment.

ENISA’s 2025 Threat Landscape found phishing accounted for 60% of observed initial-access techniques in its European incident analysis, followed by vulnerability exploitation at 21.3%.

These figures come from a different dataset than Verizon’s and should not be treated as directly comparable global percentages.

The broader lesson is that criminals attack both systems and people.

The News Ink’s phishing warning signs guide should therefore sit directly beside this page in the Cybersecurity cluster.

Exposed Remote Access

Remote administration services can become dangerous when they are exposed to the internet, poorly configured or protected by weak credentials.

Attackers may brute-force passwords, use credentials purchased from other criminals or exploit vulnerabilities in remote-access software.

This is another reason strong authentication, limited exposure and network monitoring matter.

What Happens After Criminals Gain Access?

Initial access is only the first step.

The attacker wants to turn one foothold into control over systems valuable enough to extort.

Reconnaissance Inside the Network

Criminals may search for:

• administrator accounts
• file servers
• backup systems
• domain controllers
• cloud storage
• sensitive customer information
• financial records

This stage can determine how damaging the final incident becomes.

Privilege Escalation

A compromised ordinary account may have limited power.

Attackers therefore try to obtain administrator privileges.

With greater permissions, they may be able to disable security software, access more servers and alter recovery settings.

This is why the principle of least privilege is so important.

Employees and software should receive only the access they genuinely require.

Lateral Movement

Lateral movement means moving from one compromised system to other systems.

One infected laptop should not automatically provide unrestricted access to an entire company.

Network segmentation, identity controls and monitoring can make lateral movement harder.

Data Exfiltration

Many modern groups steal information before disrupting systems.

Potential targets include:

• customer records
• employee information
• contracts
• intellectual property
• financial data
• medical records

The stolen information creates another source of leverage.

Even if the organization restores all encrypted systems from backup, criminals can threaten publication.

That is why modern attacks increasingly overlap with the broader problem of a data breach.

Encryption and the Ransom Note

Once attackers are ready, they may deploy encryption across large parts of the environment.

Files become inaccessible.

Applications stop working.

Shared drives may become unavailable.

Employees may be locked out of systems needed to run normal operations.

Attackers then leave instructions demanding payment, often in cryptocurrency.

Some may promise:

• a decryption key
• deletion of stolen information
• proof that files can be restored
• silence about the incident

Those promises come from criminals.

There is no guarantee they will be honored.

The FBI’s ransomware guidance states that it does not support paying a ransom because payment does not guarantee recovery and encourages further criminal activity.

What Is Double Extortion?

Double extortion combines two forms of pressure:

1. Encrypt the victim’s data or systems.

2. Steal information and threaten to publish it.

This model weakens the traditional defense of simply restoring from backup.

Suppose a hospital has excellent backups.

It can restore encrypted servers.

But if attackers have already copied patient information, the confidentiality problem remains.

Criminals may also contact customers, employees or business partners to increase pressure.

CISA explicitly includes data extortion in its modern Ransomware guidance because attackers increasingly use stolen information as leverage even when encryption fails or is not deployed.

What Is Ransomware-as-a-Service?

Ransomware-as-a-Service, commonly shortened to RaaS, is a criminal business model that separates malware development from intrusion and deployment.

A core group may maintain the malicious software and infrastructure.

Affiliates then conduct attacks using that platform and share revenue with the operators.

Other criminals may specialize in:

• stealing credentials
• selling initial network access
• money laundering
• hosting leak sites
• negotiating payments

This specialization lowers the technical barrier to entry.

An attacker does not necessarily need to develop sophisticated malware from scratch.

ENISA says the 2024-2025 European ransomware ecosystem became increasingly fragmented, with new variants and RaaS programs emerging. It identified 82 variants deployed against EU organizations during the reporting period.

That fragmentation also explains why eliminating one criminal brand does not eliminate the underlying threat.

Affiliates can move.

Infrastructure can be rebuilt.

Groups can rebrand.

Which Organizations Are Most at Risk?

Almost any organization can be targeted.

Attackers care about whether a victim has something valuable and whether disruption creates pressure to pay.

Commonly targeted sectors include:

• healthcare
• manufacturing
• government
• education
• financial services
• professional services
• critical infrastructure

The FBI’s 2025 IC3 report says the ten most frequently reported ransomware variants particularly affected critical manufacturing, healthcare and public health, and government facilities.

Small businesses are not immune.

They may be attractive because they can have weaker security while still controlling valuable customer records, financial information or access to larger partners.

Why Ransomware Can Be So Expensive

The ransom itself can be only one part of the cost.

An organization may also face:

• business interruption
• forensic investigation
• system rebuilding
• legal expenses
• customer notifications
• regulatory consequences
• credit monitoring
• lost sales
• reputational damage

This is why the FBI cautions that the roughly $32 million in directly reported 2025 IC3 losses does not represent the complete economic impact of these attacks.

A company can refuse payment and still face a very expensive recovery.

Cyber resilience therefore matters just as much as preventing the initial infection.

Should You Pay a Ransom?

The FBI does not support paying.

CISA and partner agencies also discourage payment because paying does not guarantee files will be recovered, may encourage additional attacks and may fund criminal activity.

There is also no guarantee criminals will:

• provide a working decryption key
• delete stolen information
• avoid targeting the victim again

Verizon’s 2026 DBIR provides an encouraging trend: 69% of ransomware victims in its dataset did not pay, while median payments among those that did declined.

For organizations facing an active incident, payment decisions can involve legal, operational, insurance and regulatory considerations.

They should be handled with qualified legal counsel, incident-response specialists and appropriate authorities rather than improvised under pressure.

How to Protect Against Ransomware

There is no single product that prevents every attack.

The strongest defense is layered.

1. Patch Internet-Facing Systems Quickly

Because exploitation of vulnerabilities has become a major breach entry point, internet-facing systems should receive priority.

Organizations should know which:

• VPNs
• firewalls
• servers
• remote-access tools
• web applications

are exposed publicly.

CISA’s StopRansomware Guide recommends keeping operating systems, software and firmware updated and prioritizing defenses against common initial-access vectors.

2. Use Strong MFA

If attackers steal a password, MFA can provide another barrier.

Important accounts should use the strongest practical authentication available.

Start with:

• administrator accounts
• email
• remote access
• cloud services
• backup consoles

MFA should be part of a wider identity strategy rather than treated as a magic shield, but it can dramatically reduce the value of stolen credentials.

3. Use Unique Passwords

Password reuse allows one breach to create many additional compromises.

A reputable password manager can make unique credentials practical.

4. Protect Backups

Backups are one of the most important defenses against destructive encryption.

But criminals know this.

Attackers may deliberately search for backup systems and try to delete or encrypt them before launching the final attack.

CISA recommends maintaining protected backups and testing restoration procedures.

Important backups should therefore be:

• separated from normal systems
• protected by strong authentication
• resistant to alteration
• tested regularly

A backup that has never been successfully restored is not yet a proven recovery plan.

5. Limit Administrator Privileges

Employees should not routinely operate with powerful administrator accounts when they do not need them.

Separate administrative accounts can reduce the damage from compromised everyday credentials.

The same rule applies to applications and service accounts.

6. Segment Networks

Network segmentation limits how far an attacker can move.

A compromised employee device should not automatically provide direct access to critical servers, backup systems and production infrastructure.

Segmentation is particularly important for organizations that operate sensitive or operational technology.

7. Train People Against Realistic Phishing

Security awareness should teach employees to recognize realistic threats rather than only obvious spam.

Training should include:

• fake login pages
• urgent payment requests
• malicious document-sharing links
• MFA approval attacks
• impersonation

People should also know how to report suspicious messages quickly.

8. Monitor for Unusual Activity

Prevention can fail.

Detection therefore matters.

Possible warning signals include:

• unexpected administrator accounts
• unusual logins
• large data transfers
• security tools being disabled
• unusual remote-management activity
• mass file changes

The earlier defenders detect criminal activity, the greater the chance they can stop the attack before widespread encryption.

9. Secure Cloud Environments

Modern businesses increasingly store important information and backups in cloud services.

Poorly protected cloud administrator accounts can create enormous risk.

Review:

• identity permissions
• exposed storage
• backup access
• API credentials
• administrator roles

The News Ink’s cloud security risks guide explains the shared-responsibility problem in more detail.

10. Have an Incident-Response Plan

The worst time to decide who handles a major cyber incident is after systems are already down.

Organizations should determine in advance:

• who has authority to isolate systems
• who contacts legal counsel
• which forensic provider will help
• how executives are informed
• who contacts law enforcement
• how customers or regulators are notified

The plan should be tested through exercises.

What to Do During a Ransomware Attack

If an organization discovers active encryption or strong evidence of compromise, speed matters.

CISA’s response guidance emphasizes isolating affected systems, preserving evidence, assessing the scope and coordinating recovery.

A practical response sequence is:

Isolate Compromised Systems

Disconnect affected devices from networks when doing so can safely limit spread.

If multiple systems appear compromised, broader network isolation may be required.

Do Not Immediately Destroy Evidence

Logs, ransom notes, memory captures and malicious files may help investigators understand what happened.

Incident-response professionals should guide forensic preservation.

Protect Backups

Confirm that clean recovery copies remain isolated from compromised credentials or systems.

Reset Compromised Credentials

Attackers may retain valid usernames, passwords, session tokens or administrative accounts.

Recovery should therefore include identity remediation, not only reinstalling servers.

Determine Whether Data Was Stolen

Encryption and data theft are separate problems.

Investigators need to establish whether information left the organization.

That finding may affect notification and regulatory obligations.

Contact Authorities and Incident Specialists

The FBI encourages victims to report incidents through a local field office or IC3, while CISA provides response resources and assistance for U.S. organizations.

Other countries have their own national cybersecurity and law-enforcement channels.

Restore Carefully

Do not reconnect systems simply because files can be restored.

The underlying access path must be addressed.

Otherwise attackers may still have credentials, persistence or another route back into the environment.

For a broader recovery workflow, use The News Ink’s data breach response guide.

How Individuals Can Reduce Ransomware Risk

Ransomware is often discussed as an enterprise problem, but individuals can also lose important files.

Personal defenses are simpler:

• keep operating systems and applications updated
• avoid unexpected attachments
• use reputable security software
• back up important files
• use unique passwords
• turn on MFA
• protect email accounts carefully

Photos, personal documents and work files should not exist in only one location.

A useful backup approach is to maintain more than one copy, with at least one separated from the device that could become infected.

Ransomware and Artificial Intelligence

Artificial intelligence is likely to affect both sides of the problem.

Attackers can use AI to help with:

• reconnaissance
• phishing content
• vulnerability research
• automation

Defenders can use it for:

• alert analysis
• malicious-code detection
• vulnerability prioritization
• incident investigation

Verizon’s 2026 DBIR says generative AI is augmenting 15 different attack techniques in its analysis, showing that AI is increasingly becoming part of broader cyber operations rather than a completely separate threat category.

This creates a natural connection between the Cybersecurity pillar and The News Ink’s AI Safety guide, but the two topics should remain separate evergreen clusters.

Why the Ransomware Problem Has Not Disappeared

Law-enforcement operations have disrupted major criminal groups and infrastructure.

Victims are also becoming more willing to refuse payment.

Yet the ecosystem adapts.

ENISA’s 2025 threat landscape describes increasing fragmentation across criminal groups and the emergence of new variants and RaaS programs. It still identifies ransomware as the most impactful cyber threat in the EU during its reporting period.

This adaptability is why organizations should not build defenses around the name of one criminal gang.

The durable defenses target techniques:

• vulnerable systems
• weak identity protection
• excessive privileges
• poor segmentation
• exposed backups
• inadequate monitoring

Criminal brands change.

These defensive principles remain useful.

Frequently Asked Questions About Ransomware

What is ransomware in simple terms?

Ransomware is malicious activity that blocks access to systems or data, steals information for extortion, or combines both tactics while criminals demand payment.

How does ransomware usually get into a system?

Common entry points include software vulnerabilities, stolen credentials, phishing and poorly secured remote-access services.

Does ransomware always encrypt files?

No. Some attacks rely entirely on stealing information and threatening to publish it. Others combine data theft with encryption.

What is double extortion?

Double extortion occurs when attackers both encrypt systems and steal information, then use the threat of public disclosure as additional pressure.

What is ransomware-as-a-service?

Ransomware-as-a-Service is a criminal business model in which operators provide malware and infrastructure to affiliates who conduct attacks and share the proceeds.

Can backups stop ransomware?

Backups can greatly improve recovery from encryption, but they cannot undo stolen data. Backups must also be protected because attackers may target them.

Should victims pay?

The FBI, CISA and partner agencies discourage payment because it does not guarantee recovery and can encourage further criminal activity.

Can antivirus stop ransomware?

Security software can help detect malicious activity, but no single security product is enough. Effective protection also requires patching, identity security, backups, least privilege, monitoring and incident response.

Are small businesses targets?

Yes. Smaller organizations can have weaker security and still hold valuable information or provide access to larger partners.

What should happen first after an attack?

The immediate priorities are to contain the incident, protect unaffected systems and backups, preserve evidence, activate incident-response procedures and obtain qualified assistance.

Ransomware Defense Is Really About Resilience

Ransomware succeeds when attackers can turn access to a digital environment into leverage.

Sometimes that leverage comes from encryption.

Sometimes it comes from stolen information.

Often it comes from both.

That is why modern defense cannot depend on a single security product or one backup drive.

Organizations need to prevent attackers from getting in, make it harder for them to move after entry, detect suspicious activity before the final attack, protect recovery systems and know how to respond under pressure.

The most useful priorities are straightforward:

patch exposed vulnerabilities + protect identities + train people + limit privileges + segment networks + secure backups + monitor systems + practice incident response

None of those controls can guarantee that an organization will never experience a cyberattack.

Together, they can dramatically reduce the chance that one compromised account or vulnerable server becomes a full organizational crisis.

Ransomware will continue evolving because the criminal ecosystem is adaptable and financially motivated.

The defensive goal should therefore not be to prepare for one named ransomware group.

It should be to build systems resilient enough that whichever group arrives next has a much harder time succeeding.

Follow The News Ink

Stay connected with The News Ink for cybersecurity, artificial intelligence, technology, business and emerging digital risks.

Follow us on X, Instagram, Threads, TikTok, Bluesky and Mastodon.

Read longer analysis on Medium, Substack and Quora, and follow visual stories on Pinterest.