Cybercrime Examples (2023): The 10 Worst Attacks of All Time

By Tibor Moes / Updated: May 2023

Cybercrime Examples (2023): The 10 Worst Attacks of All Time

Cybercrime Examples

Imagine strolling through your neighborhood and seeing a thief trying to break into your neighbor’s house. Now, picture the same scenario, but instead of houses, it’s computers, and instead of your neighborhood, it’s the vast digital world – this is the essence of cybercrime.

In this article, we’re going to take a step into the shadowy world of cybercrime, and recount the ten most notorious cyber attacks that have left an indelible mark on our digital landscape.

Please note that it’s difficult to estimate the exact financial damage caused by these incidents, so take them with a grain of salt.


Cybercrime is any criminal activity that involves a computer. It can serve either as the target of the crime or as its tool.

  1. ILOVEYOU Virus (2000): This computer worm caused havoc by spreading through email worldwide. It affected millions of individual users, businesses, and government agencies, causing around $15 billion in damages. The culprits, surprisingly, were young programmers from the Philippines.
  2. Code Red Worm (2001): This cyber pest exploited a flaw in Microsoft’s software, causing global disruption, including a denial-of-service attack on the White House’s website. It led to an estimated $2 billion in damages.
  3. MyDoom Worm (2004): This cyber bug quickly spread through emails, making it the fastest-spreading email worm in history. It caused widespread disruption and an estimated $38 billion in damages.
  4. Zeus Trojan Horse (2007): Like a crafty thief in disguise, this malicious software stole banking login details from users worldwide, particularly in the U.S. The criminals behind it drained an estimated $3 billion from victims’ accounts.
  5. Conficker Worm (2008): This worm exploited a vulnerability in the Windows operating system, creating a botnet that affected millions of users worldwide. The overall cost of the disruption was around $9 billion.
  6. Stuxnet Worm (2010): This cyber weapon targeted specific industrial systems, particularly Iran’s nuclear program. Although the financial damage was around $2 billion, the geopolitical implications were significant.
  7. Home Depot Data Breach (2014): Hackers stole the credit card information of 56 million customers in the U.S. and Canada, resulting in a loss of about $179 million. The culprits were later caught and faced legal consequences.
  8. WannaCry Ransomware Attack (2017): Like being trapped in your own house, this cyber attack locked up data on computers worldwide, demanding a Bitcoin ransom. It hit 200,000 computers in 150 countries, with a particularly large impact on the UK’s National Health Service. Overall, the attack cost the global economy an estimated $4 billion.
  9. NotPetya Attack (2017): Rather than just stealing, this cyber attack erased data, causing chaos and damage worldwide. Companies such as shipping giant Maersk and pharmaceutical company Merck were heavily affected. The impact was particularly severe in Ukraine, with global damages totaling around $10 billion.
  10. Equifax Data Breach (2017): A failure to patch a known vulnerability led to the exposure of personal information of nearly 148 million people, mostly Americans. The fallout, including settlements, fines, and reputation damage, cost Equifax an estimated $1.4 billion.

Don’t become a victim of cybercrime. Protect your devices with the best antivirus software and your privacy with the best VPN service.

Cybercrime Examples In-Depth

1. The ILOVEYOU Virus (2000)

  • Type: Computer Worm.
  • Estimated damage: $15 billion.

Remember when receiving an email was exciting? Back in 2000, an email titled “ILOVEYOU” spread like a love-struck wildfire through the online world. But this was no heartfelt confession; it was a destructive computer worm.

This worm didn’t discriminate; it affected millions of individual users, businesses, and even government agencies globally. The damage was staggering, with the financial loss estimated at around $15 billion. That’s like everyone in Los Angeles having to fork out nearly $4,000 each!

The culprits behind the ILOVEYOU virus were surprisingly found to be a couple of young programmers from the Philippines. However, due to the lack of cybercrime laws in the Philippines at the time, they faced no significant legal consequences.

The ILOVEYOU virus left a lasting legacy, prompting many countries, including the Philippines, to ramp up their cybersecurity laws. But for many, the memory of the ‘love bug’ serves as a reminder that not everything in your inbox is as sweet as it seems.

2. The Code Red Worm (2001)

  • Type: Computer Worm.
  • Estimated damage: $2 billion.

Think about an annoying bug buzzing around your house, getting into every room, no matter how hard you try to keep it out. That’s what the Code Red worm was like for the digital world. It appeared in 2001, exploiting a flaw in Microsoft’s Internet Information Server software.

The worm was a cyber nuisance on a global scale, affecting both personal users and businesses. The most notable target was the White House’s website, which had to change its IP address to avoid a denial-of-service attack. The worm caused an estimated $2 billion in damages. To put that in perspective, that’s enough to buy over 500,000 top-of-the-line laptops!

The creators of the Code Red worm were never identified, a trend that’s all too common in the world of cybercrime. The worm didn’t steal data or demand a ransom; it just caused havoc and disruption, a digital version of a graffiti tagger marking their territory.

However, the Code Red worm was a wake-up call for many, highlighting the importance of regularly updating software to protect against potential threats.

3. The MyDoom Worm (2004)

  • Type: Computer Worm.
  • Estimated damage: $38 billion.

Picture a rumor spreading like wildfire through a small town, reaching everyone before anyone can stop it. Now, imagine that in the digital world – that’s what happened with the MyDoom Worm. This nasty little bug, appearing in 2004, holds the infamous record for the fastest-spreading email worm ever.

This cyber pest didn’t care who you were; it infected individual users, businesses, and even government systems around the world. MyDoom was not picky; it wanted to spread, and spread it did, causing a stunning estimated $38 billion in damages. That’s roughly the cost of hosting two Olympic Games!

The exact identity of the culprits behind MyDoom remains a mystery, making it a cold case in the annals of cybercrime history. The worm’s primary purpose seemed to be causing disruption rather than stealing information, but it certainly achieved that aim with flying colors.

The MyDoom worm, despite being almost two decades old, serves as a potent reminder of how easily cyber threats can spread if we’re not careful about what we open and where we click.

4. The Zeus Trojan Horse (2007)

  • Type: Trojan Horse.
  • Estimated damage: $3 billion.

Imagine a sneaky criminal disguising themselves as your friendly postman to gain access to your house. That’s essentially what the Zeus Trojan Horse did in the digital realm. Launched around 2007, this crafty piece of malicious software or ‘malware’ masked itself as harmless to trick users and gain access to their systems.

Zeus was a sneaky pickpocket, specifically designed to steal banking login credentials. It was like a digital sticky-fingers, snatching away sensitive information from countless individuals and businesses, mainly in the U.S. but also worldwide.

With the stolen information, the criminals behind Zeus siphoned off an estimated $3 billion. Yes, you read that right, billion with a ‘b’! They were later identified as a sophisticated organized crime group, proving that cybercrime isn’t just the work of lone wolves.

While Zeus was eventually tamed by the efforts of security researchers and law enforcement, it showed how cybercrime could result in direct financial loss for millions of unsuspecting victims. Sadly, despite international efforts, the perpetrators remain largely unpunished, slipping away into the murky depths of the cyber underworld.

5. The Conficker Worm (2008)

  • Type: Computer Worm and Botnet.
  • Estimated damage: $9 billion.

Imagine a thief who could pick any lock in town – that’s what the Conficker worm was like. This sneaky worm appeared in 2008, exploiting a vulnerability in the Windows operating system to sneak into computers.

Once inside, Conficker formed a network of infected computers (a botnet) that it could control, affecting millions of users worldwide and causing an estimated $9 billion in damages. That’s more than the annual GDP of many small countries!

The architects of Conficker have never been identified, adding another unsolved mystery to the world of cybercrime. This worm didn’t steal information or demand a ransom; instead, it used the infected computers for nefarious activities like sending spam and installing additional malware.

In response to the Conficker worm, a group of experts formed the Conficker Working Group to combat the threat. The battle against Conficker showcased the importance of global cooperation in the fight against cybercrime. Yet, despite these efforts, the individuals behind the worm remain at large, a stark reminder that in the vast digital world, catching the bad guys isn’t always easy.

6. The Stuxnet Worm (2010)

  • Type: Computer Worm.
  • Estimated damage: $2 billion.

Imagine a spy sneaking into a secure facility to sabotage their operations – that’s basically what the Stuxnet worm did, only in the digital world. Appearing in 2010, Stuxnet wasn’t just a typical worm; it was a cyber weapon, designed to target specific industrial systems.

The primary target of Stuxnet was Iran’s nuclear program. The worm caused centrifuges used in their nuclear facilities to spin out of control, effectively setting back the program without a physical attack. The financial damage wasn’t as high as some other attacks, but the geopolitical implications were significant.

While no official attribution has been made, many experts believe Stuxnet was the work of the US and Israeli governments, showing how cyber warfare can become a tool for nation-states. The Stuxnet worm opened a new chapter in the history of cybercrime, where cyber attacks could have real-world, physical impacts.

However, despite the serious nature of the attack, there were no legal consequences, mainly because the perpetrators are widely believed to be nation-states. This incident set a precedent for future cyber warfare operations and demonstrated the potential for serious physical consequences resulting from cyber attacks.

7. The Home Depot Data Breach (2014)

  • Type: Data Breach.
  • Estimated damage: $179 million.

Imagine walking into a store and unintentionally dropping your wallet, only to have a stranger pick it up and go on a shopping spree. That’s similar to what happened to 56 million customers during the Home Depot data breach in 2014.

This incident affected Home Depot customers across the United States and Canada. If you shopped at Home Depot during the breach, your credit or debit card information could have been stolen, a scary thought for anyone.

The financial impact was significant, with an estimated loss of $179 million. That’s enough to buy a small island! The breach was caused by a group of hackers who installed malware on Home Depot’s self-checkout systems in the U.S and Canada.

The hackers responsible for the breach were eventually identified and arrested. The legal consequences were serious, with the lead hacker sentenced to over seven years in prison.

This breach serves as a cautionary tale for both businesses and consumers about the importance of data security. It reminds us all to stay vigilant, because even something as simple as buying a lightbulb could put your personal information at risk.

8. The WannaCry Ransomware Attack (2017)

  • Type: Ransomware.
  • Estimated damage: $4 billion.

Just imagine you’re in your house, but suddenly, you can’t open any doors or windows unless you pay a hefty fee – that’s kind of what ransomware does to your computer. WannaCry was a nasty piece of this sort of cyber trouble. It traveled around the world in May 2017, locking up data and demanding a ransom in Bitcoin to release it.

WannaCry was a global event, affecting over 200,000 computers in 150 countries. It targeted a weakness in older Windows systems, so individuals, businesses, and even healthcare services using these systems were hit. The UK’s National Health Service was one of the most notable victims, with the disruption to hospitals and clinics causing widespread concern.

Financially, WannaCry caused a massive dent in the global economy, racking up an estimated $4 billion in damages. That’s a lot of money gone, just like that! Despite the damage, the perpetrators behind WannaCry are still unknown, though some experts have pointed fingers at North Korea.

The attack ended when a security researcher activated a “kill switch” in the malware, but not before it served as a wake-up call for the need to keep systems updated and secure. Legal consequences? Not really, as the criminals are still at large.

9. The NotPetya Attack (2017)

  • Type: Ransomware-like.
  • Estimated damage: $10 billion.

NotPetya is like a burglar who, instead of just stealing from your house, decides to burn it down instead. In June 2017, NotPetya, named after the ransomware it mimics, started as an attack on Ukraine but soon spread worldwide.

Rather than just locking up data for ransom, this attack wiped data clean off, causing havoc and substantial damage. It hit companies hard, including shipping giant Maersk and pharmaceutical company Merck.

The scale of the attack was global, but the most severe impacts were felt in Ukraine. In terms of financial damage, NotPetya was a heavyweight, causing an estimated $10 billion in losses. That’s like every person in New York City losing $1,200!

Unlike WannaCry, there was no kill switch for NotPetya. It took hard work and time to recover from the attack. Even then, some data was just gone – poof – never to be seen again.

As for who did it, the United States and the United Kingdom have both blamed Russia, though Russia denies involvement. In terms of legal consequences, it’s much the same story as WannaCry, with no one brought to justice.

These two incidents serve as stark reminders of the destructive power of cybercrime, showing us why we must continually strive to protect our digital neighborhood.

10. The Equifax Data Breach (2017)

  • Type: Data Breach.
  • Estimated damage: $1.4 billion.

Imagine a librarian who, instead of protecting the books, decides to hand over all the personal information of library members to a bunch of crooks. That’s akin to what happened with the Equifax data breach in 2017.

Equifax, one of the three major credit reporting companies in the U.S., was responsible for safeguarding personal and financial data for hundreds of millions of people. However, in 2017, a breach exposed the personal information of nearly 148 million people. This incident affected mainly Americans, but some UK and Canadian residents were impacted as well.

The breach caused an estimated financial loss of $1.4 billion, once you factor in the cost of settlements, fines, and a massive hit to Equifax’s reputation. The cause of the breach was a failure to patch a known vulnerability in one of Equifax’s web applications.

The fallout was substantial. Equifax’s CEO resigned, and the company faced a barrage of lawsuits and government investigations. However, the hackers behind the breach were never identified, leaving a sense of unresolved injustice.

The Equifax breach highlighted the enormous responsibility companies like Equifax have in protecting consumer data, and the severe consequences when they fail. It’s a stark reminder to us all that in our digital age, our most personal information can be exposed with just a few keystrokes.


As we pull the curtain on our tour of the cybercrime hall of infamy, it’s clear that the online world, much like the real world, can be a challenging neighborhood. But don’t worry, just like locking your doors at night and being careful where you go, there are steps you can take to stay safe in the digital landscape.

The first step is to keep your devices up-to-date. Those little pop-ups reminding you of software updates? They’re like your device’s immune system, helping to protect against the latest threats. Ignoring them is like walking into flu season with no jacket or umbrella.

Next, consider investing in antivirus software. Good antivirus software like Norton, Bitdefender, McAfee, Panda, or Kaspersky, acts like a digital guard dog, always watching for any signs of trouble. It can’t stop everything, but it significantly increases your safety.

And, remember, just like in the real world, if something seems too good to be true online, it probably is. So, be careful about what you click on, who you share information with, and where you go in the vast digital landscape.

In the end, we all play a role in maintaining our own safety in the world of cyberspace. Let’s make sure we’re doing everything we can to keep our digital neighborhood secure.

Read more

If you want to learn more, we recommend the following resources:

  1. Cybersecurity & Infrastructure Security Agency (CISA) Reports and Resources:
  2. Federal Bureau of Investigation (FBI) Internet Crime Reports:
  3. Symantec Internet Security Threat Report:
Author: Tibor Moes

Author: Tibor Moes

Founder & Chief Editor at SoftwareLab

Tibor has tested 39 antivirus programs and 30 VPN services, and holds a Cybersecurity Graduate Certificate from Stanford University.

He uses Norton to protect his devices, CyberGhost for his privacy, and Dashlane for his passwords.

You can find him on LinkedIn or contact him here.