Botnet Examples (2023): The 7 Worst Attacks of All Time

By Tibor Moes / Updated: May 2023

Botnet Examples (2023): The 7 Worst Attacks of All Time

Botnet Examples 

Imagine if you could turn thousands of computers into your personal puppets, doing your bidding without their owners ever knowing. This is the eerie reality of a botnet, a ghostly network of enslaved computers.

Strap in as we explore the murkiest depths of the digital underworld, revealing the most notorious botnet examples in history.


A botnet is a group of computers controlled remotely by a hacker who uses their combined resources to carry out attacks against websites, computer networks, and internet services. If your computer is infected with malware, it may be part of a botnet.

  1. Agobot (2002): One of the earliest botnets, Agobot was designed to distribute spam and steal personal information.
  2. Storm Botnet (2007): Named after the email subject “230 dead as storm batters Europe”, it was one of the first botnets to use peer-to-peer communication.
  3. Conficker (2008): Also known as Downup or Downadup, Conficker infected millions of computers worldwide, leading to a massive botnet that could launch destructive attacks.
  4. Zeus (2009): This botnet was used to steal banking details and other personal information from infected computers, leading to significant financial losses.
  5. Cutwail (2009): One of the largest spam botnets, responsible for a large portion of the world’s spam emails at its peak.
  6. Miraibotnet (2016): Notorious for a massive DDoS attack that took down major websites, including Twitter, Netflix, and Reddit.
  7. Emotet (2014-2020): Originally a banking Trojan, it evolved into a botnet delivering a variety of malware. It was taken down by international law enforcement in 2020.

Don’t let your PC become part of botnet. Protect your devices with the best antivirus software and your privacy with the best VPN service.

Botnet Examples In-Depth

1. Agobot (2002)

Back in the early days of 2002, a new kind of threat was quietly brewing in the world of cyberspace. This menace was Agobot, one of the earliest botnets to plague the digital realm. This notorious botnet ran amok for several years, spreading its tendrils into personal computers and seizing control without a hint of detection.

The mastermind behind Agobot was a single individual known as ‘AKILL’, a young man from New Zealand. AKILL’s handiwork wreaked havoc internationally, crossing borders and boundaries in the blink of an eye, illustrating the unprecedented reach of this new form of cyber attack.

Agobot primarily targeted individual users, stealthily creeping into their systems to distribute spam and steal sensitive personal information. The numbers of those affected quickly swelled into thousands, emphasizing the personal and social consequences of this burgeoning threat.

The financial damage inflicted by Agobot was substantial, although the exact figures remain elusive. However, the theft of personal data and the cost of spam mail distribution were significant, painting a grim picture of cybercrime’s economic impact.

Eventually, the law caught up with AKILL. Rigorous investigation and international cooperation led to his arrest in 2004, marking one of the first major legal repercussions in the fight against botnet-driven cybercrime. In the aftermath of the Agobot saga, cybersecurity measures were ramped up worldwide, heralding a new era of vigilance and resilience against such threats.

2. Storm Botnet (2007)

Fast forward to 2007, when ominous email subject lines like “230 dead as storm batters Europe” began appearing in inboxes worldwide. This was the calling card of the Storm Botnet, named after its deceptive email hook. The attack lasted well into 2008, creating a tempest that shook the cyber world.

The perpetrators behind Storm Botnet remain shrouded in mystery. Rumors pointed towards organized crime groups, but the true identities of these digital puppet masters have never been confirmed. Their targets were as diverse as their origins were obscure, ranging from individual users to businesses, demonstrating the broad spectrum of potential victims.

Storm Botnet’s scope was massive and global, infecting millions of computers across continents. Its primary aim was not to steal, but to control, creating a vast network of infected computers that could be used for a variety of nefarious activities.

The financial damage caused by Storm Botnet is hard to quantify but certainly ran into millions. However, the real impact lay in the number of people affected and the disruption caused. This botnet was among the first to use peer-to-peer communication, making it incredibly resilient and difficult to take down.

Despite its scale, the Storm Botnet was eventually mitigated. This was no small feat, as it required a concerted effort from security researchers around the globe. The aftermath of the Storm Botnet attack brought about increased scrutiny and enhancements in cybersecurity, making it a watershed moment in the ongoing battle against botnets.

While no legal consequences arose directly from the Storm Botnet incident due to the anonymity of its perpetrators, it served as a stark reminder of the evolving nature of cyber threats, and the necessity for constant vigilance and robust legal measures.

3. Conficker (2008)

As we ushered in the year 2008, an unsuspecting digital world was about to meet one of its most formidable foes: Conficker. Also known as Downup or Downadup, this botnet embarked on a year-long campaign of cyber chaos, infecting millions of computers worldwide.

The creators of Conficker remain unknown, a ghostly presence orchestrating one of the most extensive botnet attacks in history. They cast a wide net, targeting individuals, businesses, and even governments, demonstrating a terrifying capability and intent.

Conficker’s influence was far-reaching, its tendrils extending to every corner of the globe. It was indiscriminate and ruthless, illustrating the international nature of these cyber threats.

The financial fallout from Conficker was staggering. While the exact figure remains unclear, the sheer number of infected computers and the cost of mitigation efforts undoubtedly ran into billions. It was a stark illustration of the severe economic impact of botnet attacks.

The nature of data compromised by Conficker was diverse. From personal details to sensitive government information, nothing was safe from this digital marauder. It was a clear indication of the varying levels of potential harm posed by such threats.

The fight against Conficker was a collective effort, involving entities like the Conficker Working Group, an alliance of security firms and researchers. Their efforts, along with software updates and increased user vigilance, helped mitigate the botnet’s impact. The aftermath of Conficker saw significant enhancements in global cybersecurity measures, a testament to our resilience against such threats.

While there were no direct legal consequences due to the anonymous nature of the botnet’s creators, the Conficker saga underscored the urgent need for robust cybercrime laws and their enforcement.

4. Zeus (2009)

2009 saw the rise of Zeus, a botnet that would etch its name in the annals of cybercrime. Zeus was a threat of a different nature, focusing not on sheer scale but on financial exploitation.

Zeus was believed to be the brainchild of a Russian hacker, showcasing the global and borderless nature of cyber threats. This botnet didn’t discriminate between targets, going after individuals and businesses alike, siphoning off banking details and other personal information.

The geographic scope of Zeus was as vast as its ambition. This cyber menace reached far and wide, from the United States to Europe and beyond, infecting millions of computers in its wake.

The economic damage inflicted by Zeus was substantial. It’s estimated that the botnet was responsible for stealing tens of millions of dollars, making it one of the most financially damaging botnets in history.

The data compromised by Zeus was primarily financial. It specialized in stealing banking details, posing severe risks to individuals and businesses. The scale of the theft was a grim reminder of the potential financial harm inflicted by such cyber threats.

Mitigating Zeus was a complex endeavor. Efforts from international law enforcement and security firms, coupled with increased user awareness, eventually managed to bring Zeus under control. However, the botnet’s legacy led to significant enhancements in banking security and user authentication protocols.

In terms of legal consequences, the creator of Zeus was eventually identified and apprehended in 2011. This marked a significant victory in the fight against cybercrime and served as a deterrent for future cybercriminals.

5. Cutwail (2009)

Unleashed in 2009, Cutwail was a botnet that took a different approach to cybercrime. Instead of stealing or causing destruction, it specialized in distributing spam emails, turning infected computers into unwilling accomplices in its quest to fill inboxes with junk mail.

The masterminds behind Cutwail were a group of Russian hackers. Their aim was not to steal sensitive data, but to turn a profit by sending spam emails for others, a demonstration of the diverse motives behind botnet attacks.

Cutwail’s victims were primarily businesses, but its spam emails found their way into the inboxes of countless individuals worldwide. Its geographic scope was truly global, illustrating the borderless nature of these cyber threats.

The financial damage caused by Cutwail is difficult to quantify, but it was significant. Businesses lost productivity due to the deluge of spam, and the cost of spam filtering services spiked. This highlighted the indirect but substantial economic impact of such attacks.

While Cutwail did not directly compromise sensitive data, it indirectly facilitated other cybercrimes. The spam it distributed often contained malware, leading to the infection of countless other computers and the potential theft of sensitive data.

The countermeasures against Cutwail were multifaceted. Anti-spam technology improved, and global cooperation led to the takedown of its command and control servers. However, the fight against spam continues to this day, a testament to the persistent nature of this threat.

In 2012, Russian authorities arrested the creators of Cutwail, a significant victory in the battle against botnets. This case served as a stark reminder of the legal consequences that await those who engage in such cybercrimes.

6. Miraibotnet (2016)

In 2016, a new player entered the botnet arena. Named Mirai, this botnet marked a significant shift in the world of cybercrime, as it primarily targeted Internet of Things (IoT) devices instead of traditional computers.

Mirai was created by three college students in the United States. Their goal was not financial gain but to gain an advantage in the popular game Minecraft. However, their creation quickly spiraled out of control, leading to one of the largest Distributed Denial of Service (DDoS) attacks in history.

Mirai’s reach was global, infecting IoT devices worldwide. It targeted businesses and Internet infrastructure providers, culminating in a massive DDoS attack that took down major websites, including Twitter, Netflix, and Reddit.

The financial damage caused by Mirai was substantial, running into millions of dollars. The downtime caused by the DDoS attack affected numerous businesses, highlighting the severe economic impact of such incidents.

Mirai’s attack didn’t compromise data directly but caused widespread disruption. Millions of users were unable to access popular websites, highlighting the social consequences of these attacks.

Efforts from cybersecurity researchers, law enforcement, and affected companies eventually mitigated Mirai’s impact. IoT security saw significant improvements as a result, showing our capacity to learn and adapt in response to new threats.

The creators of Mirai were eventually apprehended and pled guilty in 2017. Their sentencing sent a clear message about the serious legal consequences of creating and using botnets, serving as a deterrent for future cybercriminals.

7. Emotet (2014-2020)

Emotet started its journey as a banking Trojan in 2014. However, it quickly evolved into one of the most notorious botnets ever seen, a testament to the adaptability of these cyber threats. The botnet had an active run until 2020, when it was finally dismantled by international law enforcement.

The creators of Emotet are believed to be an organized crime group based in Eastern Europe. Their targets were diverse, ranging from individual users to large corporations, showing the broad spectrum of potential victims in a botnet attack.

Emotet had a global reach, with infected devices found in countries worldwide. Its main objective was to deliver a variety of malware, leading to data theft and system disruption on a massive scale.

While the exact financial damage caused by Emotet remains unknown, it’s safe to say that it ran into millions of dollars. From the cost of data breaches to system repairs, Emotet inflicted a substantial economic toll.

The data compromised by Emotet varied, but it often included personal and financial information. This botnet’s activity highlighted the serious risk posed by such threats to both privacy and financial security.

Countermeasures against Emotet required international cooperation. In January 2021, a global effort led to the takedown of Emotet’s infrastructure, effectively neutralizing the botnet. This operation underscored the importance of global collaboration in the fight against cybercrime.

While no arrests were immediately made following the takedown of Emotet, the operation marked a significant victory in the ongoing battle against botnets. It served as a reminder of the potential legal consequences awaiting those who engage in such activities.


The tales of these botnets underline the importance of cybersecurity in our increasingly digital world. But don’t worry – there are steps you can take to protect yourself.

Regularly updating your devices and installing trusted antivirus software for Windows 11 like Norton, Bitdefender, McAfee, Panda, or Kaspersky are among the most effective ways to guard against botnets. Updates often include patches for security vulnerabilities that botnets can exploit, and antivirus software can detect and remove malicious software.

But don’t stop there! Educate yourself about the latest cyber threats and safety measures. Here are a few trusted resources to get you started:

  1. Cybersecurity & Infrastructure Security Agency (CISA):
  2. National Institute of Standards and Technology (NIST):
  3. European Union Agency for Cybersecurity (ENISA):
  4. Australian Cyber Security Centre (ACSC):
  5. Cyber Threat Alliance:

Remember, in the face of cybercrime, knowledge is power. Stay informed, stay updated, and stay safe.

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.