In 2024, the digital world came under siege. From global ticketing giants and healthcare institutions to government agencies and cloud service platforms, cybercriminals launched coordinated, high-impact attacks that exposed billions of personal records, crippled infrastructure, and cost companies and countries billions of dollars. Unlike isolated incidents of the past, these breaches formed a pattern targeting weaknesses in supply chains, exploiting human error, and capitalizing on the sluggish pace of cyber defence upgrades. This article unpacks the most critical cyberattacks of 2024 and what they revealed about the world’s digital vulnerability.
It wasn’t just one sector or one country that felt the heat. 2024’s cyberattacks cut across industries and borders. The year began with a paralyzing ransomware attack on Change Healthcare, freezing pharmacy systems across the United States and affecting millions of patients. Soon after, data broker National Public Data suffered a catastrophic leak of nearly 3 billion sensitive records. Cloud infrastructure, once considered untouchable, was also breached, with Snowflake clients facing widespread data theft due to poor password hygiene. Financial institutions, entertainment platforms, healthcare networks, and even national defense payroll systems all became prime targets. What connected these incidents wasn’t just their scale—but the repeated failure of basic cyber hygiene: unsecured portals, missing multi-factor authentication, and over-reliance on third-party vendors.
Below is a detailed, structured overview of the major hacking attacks of 2024. Each incident is separated by heading, with key details including incurred loss, attack location, and additional context.
1. Change Healthcare Ransomware Attack
Location: United States (nationwide)
Date: February 2024
Perpetrator: ALPHV / BlackCat ransomware group
Incurred Loss: $22 million ransom + approximately $1.5 billion in operational disruption costs
Details: Attackers gained access via stolen credentials to a Citrix remote portal that lacked multi-factor authentication (MFA). The breach paralyzed billing systems, impacted pharmacies and hospitals, and affected around 190 million Americans. Sensitive patient and billing records were compromised, highlighting critical vulnerabilities in healthcare cybersecurity and remote-access systems.
2. National Public Data / Jerico Pictures Breach
Location: United States, affecting global records
Date: April 2024
Perpetrator: Independent hacker, later arrested in Brazil
Incurred Loss: Bankruptcy, legal liabilities, and reputational damage (total financial costs not publicly disclosed)
Details: Nearly 3 billion records were exposed, containing names, Social Security numbers, addresses, and birth dates. The leak originated from National Public Data and its contractor, Jerico Pictures. The breach triggered class-action lawsuits and led to the company’s dissolution.
3. Snowflake Client Data Breach
Location: Global, via cloud platform
Date: Mid-2024
Perpetrator: UNC5537 / Scattered Spider threat group
Incurred Loss: Data exposure affecting 160+ companies; financial losses unknown but likely in the hundreds of millions
Details: Attackers used stolen customer credentials to access insecure Snowflake accounts lacking MFA. They exfiltrated a massive trove of data including 50 billion call logs and sensitive customer and financial records. Victims included major firms such as AT&T, Ticketmaster, and Santander.
4. LoanDepot Ransomware Breach
Location: United States
Date: January 2024
Perpetrator: ALPHV / BlackCat ransomware group
Incurred Loss: Over $27 million in remediation, fines, and potential settlements
Details: Similar to Change Healthcare, LoginDepot’s breach involved ransomware that encrypted data and exfiltrated personal records belonging to 16.6 million customers—names, Social Security numbers, and banking information included. The fallout prompted intense regulatory scrutiny and customer lawsuits.
5. Ticketmaster Data Breach
Location: Global
Date: May 2024
Perpetrator: ShinyHunters hacking collective
Incurred Loss: Potential reputational harm and class-action lawsuits; exact financial losses unconfirmed
Details: Alleged theft of personal and partial payment data from over 560 million users. The stolen data was subsequently offered for sale on underground markets. Ticketmaster confirmed customer contact information was compromised, though full financial extents remain undisclosed.
6. Dell Customer and Employee Data Leak
Location: Global (via reseller portal)
Date: May & September 2024
Perpetrator: Unidentified threat actors exploiting portal vulnerabilities
Incurred Loss: Data exposure of 49 million customers and ~10,000 employees; financial impact estimated in the tens of millions
Details: A brute-force attack exposed customer names, addresses, and order details. Later, employee records were accessed. The compromised portal belonged to a third-party reseller, underscoring supply-chain security weaknesses.
7. Ascension Health Ransomware Incident
Location: United States (across 19 states)
Date: May 2024
Perpetrator: Qilin ransomware group
Incurred Loss: Business interruption costs and data confidentiality impacts; financial losses undisclosed
Details: Malware infected systems after an employee downloaded a malicious file. Around 140 hospitals faced disruptions in patient care and diagnostics. Patient data was reportedly stolen, though ransom payments remain unverified.
8. UK Ministry of Defence Payroll Data Leak
Location: United Kingdom
Date: May 2024
Perpetrator: Hackers targeting a third-party payroll provider
Incurred Loss: Exposure of personal data of 270,000 personnel; compensation and remediation costs undisclosed
Details: Personal and banking data of military staff was compromised through a vendor breach, raising concerns over data governance and vendor risk management in government supply chains.
9. Indonesian National Data Center Ransomware
Location: Indonesia (government data center)
Date: June 2024
Perpetrator: Brain Cipher ransomware group
Incurred Loss: Public service downtime, estimated ransom demand around $8 million (not paid); restoration costs unspecified
Details: The attack crippled core services including immigration systems and student databases. Although authorities refused to pay the ransom, the breach exposed gaps in public-sector cybersecurity defenses.
Each attack in 2024 revealed evolving threats: ransomware groups targeting critical sectors, misconfigured platforms exposing massive datasets, and supply chain and vendor vulnerabilities compromising even the most secure organizations. These incidents underline the urgent need for robust authentication systems, vendor oversight, offline backups, and proactive incident response strategies.
The lessons from 2024 are clear. Reactive cybersecurity is no longer an option. Every breach this year—from ransomware takedowns to billion-record leaks—exploited well-known flaws. The weakest links weren’t always sophisticated code vulnerabilities but outdated credentials, poor access management, and lack of preparedness. As 2025 unfolds, organizations need to prioritize threat modeling, secure-by-design architectures, employee awareness, and cloud configuration audits. The next wave of attacks will likely be faster, smarter, and more destructive. Whether we learn from 2024’s failures—or repeat them—will define the security of our digital future.
References:
- https://www.digitaltrends.com/computing/worst-data-breaches-2024
- https://techcrunch.com/2024/12/27/record-breaking-ransoms-and-breaches-a-timeline-of-ransomware-in-2024
- https://en.wikipedia.org/wiki/2024_National_Public_Data_breach
- https://en.wikipedia.org/wiki/Snowflake_data_breach
- https://www.tomsguide.com/computing/online-security/the-top-10-data-breaches-of-2024
- https://digitalriskinc.com/biggest-data-breaches-2024
- https://www.forwardfuture.ai/p/biggest-data-breaches-of-2024-what-went-wrong-and-key-lessons-for-strengthening-cybersecurity
- https://insights.integrity360.com/biggest-cyber-attacks-of-the-year-so-far..-2024-part-2
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- https://en.wikipedia.org/wiki/List_of_data_breaches
- https://en.wikipedia.org/wiki/2024_cyberattack_on_Kadokawa_and_Niconico
- https://en.wikipedia.org/wiki/British_Library_cyberattack
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- https://www.blackhatethicalhacking.com/articles/major-cyber-attacks-that-shaped-2024
- https://www.politico.com/news/2024/11/06/chinese-hackers-american-cell-phones-00187873
- https://blog.senthorus.ch/posts/10_16_06_2025
