If you want to understand ransomware, it is not enough to say that a company was hacked. A clearer picture appears when you compare major incidents across healthcare, energy, gaming, software supply chains, and worm-like global outbreaks. Each one exposed a different weak point.［1］［2］［3］

This is not a curiosity list. It uses 7 important ransomware attack examples to explain a harder reality: ransomware is no longer a single piece of malware. It is a mature chain of intrusion, encryption, data theft, extortion, and money laundering.［1］［4］

Why are these cases worth revisiting?

Because they changed how the industry understands ransomware.

Early ransomware was often treated as random malware infection. Public reports from CISA and the DOJ now describe a more reusable business model: developers maintain platforms, affiliates handle intrusions, leak sites apply pressure, and ransom proceeds move through cryptocurrency and laundering channels.［1］［4］

If you want practical prevention advice first, read our ransomware protection guide. This article focuses on cases and trends.

7 major ransomware attacks

1. WannaCry (2017): the cost of delayed patching

WannaCry mattered not only because of its scale. It used a wormable vulnerability, turning one infected device into many compromised systems across a network. CISA still cites it as a high-impact malware case.［6］

It changed how many organizations prioritized patch management.

2. Colonial Pipeline (2021): when ransomware became a real-world disruption

The DOJ said Colonial Pipeline shut down parts of its operations after the DarkSide attack, and the department later recovered part of the ransom payment.［2］

The symbolism was powerful: a cyber incident became a critical infrastructure incident.

3. JBS (2021): food supply chains can be held up too

The White House said meat production in multiple countries was affected after JBS suffered a ransomware attack.［7］ The lesson was simple: ransomware does not only target technology companies. Any business that matters to a real-world supply chain can become valuable.

4. Kaseya (2021): one supply-chain incident, thousands of downstream victims

The Kaseya incident showed small and midsize businesses that they could be pulled into a ransomware event through an MSP or upstream tool, even if they were not the original target.［8］［9］ That is the danger of this pattern: one entry point can spread at scale.

It also echoes a point in what to do after a data breach: the failure may not start inside your own systems. It may enter through a business relationship.

5. MGM Resorts (2023): ransomware can disrupt front-desk operations too

MGM Resorts confirmed that a cybersecurity issue affected parts of its systems and that it took some systems offline as part of its response.［10］ This shows another side of modern ransomware: it can interrupt check-ins, payments, customer service, and day-to-day operations, not just encrypt back-office files.

6. Change Healthcare (2024): healthcare impact spreads outward

HHS described the Change Healthcare incident as having an “unprecedented magnitude” of impact on patients and healthcare providers.［3］ When healthcare is hit, the damage can spread through billing, claims, prescriptions, payments, and patient services.

7. LockBit (around 2024): ransomware as a platform

The DOJ said in 2024 that LockBit had attacked more than 2,000 victims worldwide and received over $120 million in ransom payments, making it one of the most active and destructive variants at the time.［4］

LockBit matters because it shows how the RaaS model standardizes and scales attacks.

What do these 7 incidents have in common?

Ransomware is no longer just file encryption

Modern incidents often involve:

stealing data before encryption;
threatening both downtime and public leaks;
attacking one company while amplifying impact through suppliers or platforms.

Attackers increasingly look like organized businesses

DOJ descriptions of groups such as LockBit and BlackCat show clear roles across development, operations, affiliates, payments, and leak sites.［1］［4］［5］

Recovery matters more than pretending you will never be targeted

For most organizations, attempted intrusion is now part of the landscape. The real difference is whether you can isolate, restore, communicate, and learn quickly.

The protection principles ordinary teams should learn

1. Backups must be offline or immutable

Otherwise, attackers may delete the backups first and negotiate afterward.

2. Lock down identity access

MFA, least privilege, and removing inactive accounts are more useful than many louder security slogans.

If you want to build endpoint awareness first, pair this with is my computer hacked?.

3. Third-party risk cannot live only in contracts

Kaseya and Change Healthcare show that when upstream providers fail, downstream customers feel the pressure.

4. Prepare the response process before debating ransom payment

During an incident, teams rarely lack opinions. They lack named contacts, isolation steps, recovery order, and external notification paths.

Many teams lose time because they never turned “isolate, communicate, recover” into an executable checklist. That connects directly to the basic hygiene covered in our digital privacy guide.

Summary

The ransomware attacks that changed the industry were not only expensive. Their impact spilled outward.
From WannaCry to LockBit, ransomware has moved from malware to a mature industry.
Supply chains, identity access, and business continuity are the lines most often exposed.
If you remember one lesson, make it this: backups, access control, and drills matter more than last-minute negotiation.

FAQ

Is ransomware just file encryption?

No. Modern ransomware often includes data theft, leak threats, lateral movement, and business disruption.［1］［4］

Are the biggest ransomware attacks always measured by ransom size?

No. Industry affected, operational disruption, supply-chain amplification, and recovery cost can matter more than the ransom itself.

Why is Colonial Pipeline such a well-known case?

Because it showed the public that ransomware could affect real-world critical infrastructure.［2］

Why is healthcare especially vulnerable to ransomware impact?

When healthcare systems go down, the impact can spread to claims, prescriptions, patient services, and payment flows.［3］

Why is LockBit mentioned so often?

Because it is a textbook example of the RaaS model: large scale, many victims, and mature operations.［4］

Are small teams too insignificant to be targeted?

No. Attackers often use MSPs, common software, leaked credentials, and automated scanning to find easy entry points. Smaller teams may be more exposed because their defenses are thinner.

Disclaimer

This article is for general cybersecurity education only. It is not incident attribution, ransom payment, compliance response, or legal advice. Public reports may be updated as incident details and timelines evolve.

The AethoVPN editorial team covers ransomware attack examples here; a VPN is not a substitute for the relevant checks.

Sources

DOJ OIG, DOJ’s Strategy to Combat and Respond to Ransomware Threats and Attacks: https://oig.justice.gov/news/doj-oig-releases-report-dojs-strategy-combat-and-respond-ransomware-threats-and-attacks
U.S. Department of Justice, Department of Justice Seizes $2.3 Million in Cryptocurrency Paid to the Ransomware Extortionists Darkside: https://www.justice.gov/opa/pr/department-justice-seizes-23-million-cryptocurrency-paid-ransomware-extortionists-darkside
HHS, Change Healthcare Cybersecurity Incident Frequently Asked Questions: https://www.hhs.gov/hipaa/for-professionals/special-topics/change-healthcare-cybersecurity-incident-frequently-asked-questions/index.html
U.S. Department of Justice, U.S. and U.K. Disrupt LockBit Ransomware Variant: https://www.justice.gov/opa/pr/us-and-uk-disrupt-lockbit-ransomware-variant
U.S. Department of Justice, Justice Department Disrupts Prolific ALPHV/Blackcat Ransomware Variant: https://www.justice.gov/archives/opa/pr/justice-department-disrupts-prolific-alphvblackcat-ransomware-variant
CISA, AA17-132A: Indicators Associated With WannaCry Ransomware: https://www.cisa.gov/news-events/alerts/2017/05/12/indicators-associated-wannacry-ransomware
The White House, Press Briefing by Press Secretary Jen Psaki, June 9, 2021: https://bidenwhitehouse.archives.gov/briefing-room/press-briefings/2021/06/09/press-briefing-by-press-secretary-jen-psaki-june-9-2021/
Kaseya, Kaseya Responds Swiftly to Sophisticated Cyberattack: https://www.kaseya.com/press-release/kaseya-responds-swiftly-to-sophisticated-cyberattack-mitigating-global-disruption-to-customers/
CISA, Kaseya Ransomware Attack: Guidance for Affected MSPs and their Customers: https://www.cisa.gov/news-events/news/kaseya-ransomware-attack-guidance-affected-msps-and-their-customers
MGM Resorts International Statement on Cybersecurity Issue: https://investors.mgmresorts.com/investors/news-releases/press-release-details/2023/MGM-RESORTS-INTERNATIONAL-STATEMENT-ON-CYBERSECURITY-ISSUE/default.aspx

Sources checked 8 May 2026.

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