How a high schooler's tool became a cybersecurity giant
In short: In 2006, Marcin Kleczynski was just a technician in a Chicago repair shop. After facing persistent infections, he built RogueRemover to fight fake antivirus programs. That simple utility eventually evolved into Malwarebytes, a global force in digital defense.
The company's origins are rooted in the practical necessity of fixing infected computers. While studying computer science at the University of Illinois, Kleczynski formally launched Malwarebytes on January 21, 2008, alongside Bruce Harrison. The duo reportedly earned $600,000 in their first year of software sales, despite not having met in person at the time. The venture initially operated out of Chicago before relocating to San Jose. This early success was bolstered by the recruitment of experts like Marcus Chung and Doug Swanson.
Malwarebytes' growth was explosive. By 2014, the company saw a revenue increase of 1653% and reported treating 250 million computers—roughly 20–25% of working business computers. By 2015, the company moved to a 52,000 square foot headquarters in Santa Clara, California, following a massive user surge that saw active users grow from 25 million to 35 million in a single year. The firm expanded its reach by acquiring the Swedish VPN provider AzireVPN in 2024. Additionally, it acquired the website blacklisting company HPhosts to better combat malicious web servers.
As threats evolved, so did the company's technology. In 2016, it introduced Endpoint Security to combat ransomware, a threat that had already impacted nearly 40% of firms surveyed by Osterman Research. More recently, the company has integrated advanced AI and machine-learning techniques into its Katana engine to proactively detect unidentified malware families. It has even expanded into the generative AI space, launching integrations with ChatGPT and Claude to help users verify suspicious links and messages directly within chat interfaces. To combat sophisticated threats, the company acquired the security firm ZeroVulnerabilityLabs in 2013. It also launched a specialized USB-based product called Techbench to assist technicians.
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- Summary by Intellect · source: Malwarebytes
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