Rootkit Examples (2024): The 7 Worst Attacks of All Time

By Tibor Moes / Updated: January 2024

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

Rootkits represent a significant cybersecurity threat, allowing attackers to gain unauthorized access to systems and remain undetected.

In this article, you will learn about the seven most devastating rootkit attacks in history, providing insights into their mechanisms and impact.


A rootkit is a type of malware designed to gain unauthorized access to a computer and remain hidden from detection.

  • Sony BMG Copy Protection Rootkit (2005): A copy protection scheme turned security nightmare, this rootkit was clandestinely installed on millions of computers. It affected over 22 million CDs distributed by Sony BMG.
  • Rustock Rootkit (2006): This rootkit created one of the largest botnets for sending spam, showcasing the power of digital threats. Estimates suggest the botnet comprised between 150,000 and 2.4 million infected machines.
  • Mebroot Rootkit (2007): Stealthily targeting the Master Boot Record, Mebroot spread through compromised websites. Infected sites with this rootkit drew between 50,000 to 100,000 views daily.
  • Stuxnet Rootkit (2010): A landmark in cyber warfare, Stuxnet caused physical damage to Iran’s nuclear program. It infected over 200,000 computers and degraded 1,000 machines.
  • Alureon/TDL-4 Rootkit (2011): A multifaceted threat, Alureon/TDL-4 stole data and compromised security systems. It infected 1.5 million computers in the US.
  • ZeroAccess Rootkit (2011): Known for its financial motives, this rootkit turned infected computers into revenue sources. ZeroAccess was present on at least 9 million systems.
  • Flame Rootkit (2012): A sophisticated tool for cyber espionage, Flame targeted specific organizations for intelligence gathering. Initially, it infected approximately 1,000 machines.

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

Rootkit Examples

1. Sony BMG Copy Protection Rootkit (2005)

In 2005, the music world was rocked by a scandal that extended far beyond the usual celebrity gossip. Sony BMG, a giant in the industry, embedded a rootkit in over 22 million CDs, as reported by the Electronic Frontier Foundation (EFF). This was not just any rootkit; it was a form of copy protection that crossed into the realm of serious security infringement.

Once a user played one of these CDs on their computer, the rootkit silently installed itself, burrowing deep into the system. Ostensibly designed to prevent piracy, it instead opened the door to a plethora of security vulnerabilities, exposing millions of unsuspecting music lovers to potential cyber threats.

This incident is a stark reminder of how digital rights management, when misapplied, can lead to significant privacy and security breaches.

2. Rustock Rootkit (2006)

A year after the Sony BMG debacle, the digital world encountered Rustock, a rootkit that marked a new era in cyber threats. According to, estimates of the size of the Rustock botnet varied wildly, with figures ranging from 150,000 to a staggering 2.4 million infected machines. This discrepancy in numbers highlights the elusive nature of rootkits and the difficulty in gauging their true impact.

Rustock was not just a minor annoyance; it turned infected computers into zombies, part of a massive botnet used for sending spam emails and other malicious activities. The scale and sophistication of Rustock showcased the evolving nature of cyber threats, where a single piece of malware could commandeer an army of computers, turning them into unwilling participants in cybercrime.

3. Mebroot Rootkit (2007)

The Mebroot rootkit, emerging in 2007, marked a significant evolution in the sophistication of cyber threats. According to Virus Bulletin, websites infected with Mebroot experienced a staggering 50,000 to 100,000 views per day.

This rootkit was particularly insidious because it didn’t just infect computers in the traditional sense; it targeted the Master Boot Record, making it incredibly stealthy and difficult to detect. Its primary method of spreading was through drive-by downloads, where unsuspecting users visiting a compromised website would unknowingly download the rootkit.

This high volume of traffic to infected sites underscored the rootkit’s widespread impact, silently turning everyday web browsing into a potential minefield of cyber threats.

4. Stuxnet Rootkit (2010)

Stuxnet, discovered in 2010, stands as a watershed moment in the history of cyber warfare. As reported by Mac Solutions, this rootkit didn’t just infect computers — it caused physical damage.

Targeting Iran’s nuclear program, Stuxnet reportedly ruined nearly one-fifth of the country’s nuclear centrifuges. It achieved this by infecting over 200,000 computers and causing physical degradation in 1,000 machines.

Stuxnet’s uniqueness lay in its ability to jump from digital to physical damage, manipulating industrial control systems to achieve its destructive ends.

This attack highlighted a frightening new reality: cyber threats could now cross the digital boundary, causing tangible, real-world destruction.

5. Alureon/TDL-4 Rootkit (2011)

In 2011, the Alureon rootkit, also known as TDL-4, emerged as a formidable threat in the cyber landscape. According to The Hacker News, this TDSS rootkit infected an astounding 1.5 million computers in the United States alone.

Alureon was more than just malware; it was a sophisticated tool for cybercriminals, enabling them to steal data, disable security software, and create a botnet for distributing spam. Its method of infection and the ability to evade detection made it a nightmare for cybersecurity professionals.

The scale of this infection, affecting millions of computers, underscored the pervasive nature of such threats and the ease with which they could infiltrate everyday devices.

6. ZeroAccess Rootkit (2011)

The same year witnessed the rise of the ZeroAccess rootkit, another massive cyber threat. As reported by Sophos, this rootkit was responsible for a botnet that infected at least 9 million systems worldwide.

ZeroAccess distinguished itself by primarily targeting advertising revenue and Bitcoin mining, turning infected computers into cash-generating machines for the attackers. Its self-updating feature meant that it could adapt and resist removal efforts, making it an especially resilient foe.

The sheer number of infected systems highlighted not only the rootkit’s widespread impact but also the vulnerability of systems across the globe to such sophisticated and financially motivated cyber attacks.

7. Flame Rootkit (2012)

The Flame rootkit, discovered in 2012, was a remarkable instance of cyber espionage and complexity. reported that Flame initially infected approximately 1,000 machines, but it’s not the number that’s most striking—it’s the sophistication and purpose of the rootkit.

Unlike many of its predecessors, Flame was not about mass infection; rather, it was a precision tool of cyber spying. It targeted specific organizations, mainly in the Middle East, with a level of complexity previously unseen in other malware. Flame could record audio, take screenshots, and transmit vast amounts of data.

Its deployment marked a new era in cyber threats, where the focus shifted to highly targeted, state-sponsored espionage operations. The discovery of Flame shed light on the growing use of cyber tools by nations for intelligence gathering, signifying a major shift in the landscape of digital security threats.


This article has unveiled the alarming reality and impact of some of the most notorious rootkit attacks in history. From the Sony BMG Copy Protection rootkit to the sophisticated Flame rootkit, each case underscores the evolving and persistent threat posed by these types of malware. These examples highlight not only the technical ingenuity behind such attacks but also the diverse and far-reaching consequences they have on individuals, organizations, and even nations.

In light of these threats, the importance of robust antivirus software cannot be overstated, especially for users of Windows 11. Brands like Norton, Avast, TotalAV, Bitdefender, McAfee, Panda, and Avira offer comprehensive protection that is crucial in today’s digital landscape.

Investing in such software is more than just a safeguard; it’s a necessary defense against the sophisticated and ever-evolving cyber threats that rootkits represent. With the right antivirus solution, users can significantly reduce their vulnerability to these malicious attacks, ensuring a safer and more secure digital experience.




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.