Stu Sjouwerman

Chief Executive Officer & President

Stu Sjouwerman (pronounced “shower-man”) is the founder and CEO of KnowBe4, Inc., which hosts the world’s most popular integrated security awareness training and simulated phishing platform, with over 54,000 organization customers and more than 50 million users. A serial entrepreneur and data security expert with 30 years in the IT industry, Stu was the co-founder of Inc. 500 company Sunbelt Software, a multiple award-winning anti-malware software company that was acquired in 2010.

Books

Cyberheist E-Book

Find all of Stu's books on Amazon

China Cybercriminals Behind Toll-Themed Smishing Attacks Surge in the US and UK

Apr 18, 2025 4:32:52 PM By Stu Sjouwerman

Resecurity warns that a China-based cybercriminal gang dubbed the “Smishing Triad” is launching a wave of road toll-themed SMS phishing (smishing) attacks against users across the US and ...

Lack of Security Awareness Tops List of Obstacles to Cyber Defense

Apr 17, 2025 1:37:19 PM By Stu Sjouwerman

Most organizations cite low security awareness among employees as the biggest barrier to defending against cyberattacks, according to a new survey by CyberEdge Group.

How Does Human Risk Management Differ from Security Awareness Training?

Apr 16, 2025 12:13:48 PM By Stu Sjouwerman

In today's cybersecurity landscape, organizations face an ever-present and often underestimated threat: human risk. Despite significant advancements in technological defenses, human error ...

AI-Powered Spear Phishing Can Now Outperform Human Attackers

Apr 16, 2025 12:13:09 PM By Stu Sjouwerman

Researchers at Hoxhunt have found that AI agents can now outperform humans at creating convincing phishing campaigns.

UK Organizations Cite Phishing as the Most Disruptive Type of Cyberattack

Apr 15, 2025 11:03:55 AM By Stu Sjouwerman

Phishing was the most prevalent and disruptive type of attack experienced by UK organizations over the past twelve months, according to the British government’s Cyber Security Breaches ...

CyberheistNews Vol 15 #15 [HEADS UP] North Korea Expands Its Fraudulent IT Worker Operations

Apr 15, 2025 9:00:00 AM By Stu Sjouwerman

Hidden Threats in Our Power Grid: The Chinese Transformer Backdoor Scandal

Apr 14, 2025 9:53:50 AM By Stu Sjouwerman

America's critical infrastructure faces an unprecedented threat, and it's already installed in hundreds of locations across the nation.

Warning: QuickBooks Phishing Campaign Targets Taxpayers

Apr 11, 2025 6:49:55 PM By Stu Sjouwerman

Cybercriminals are capitalizing on tax season by launching phishing campaigns targeting QuickBooks users, Malwarebytes reports.

64% of Australian Organizations Hit by Ransomware Were Forced to Halt Operations

Apr 10, 2025 3:04:15 PM By Stu Sjouwerman

Illumio’s recent Global Cost of Ransomware Study found that 64% of Australian companies hit by ransomware had to shut down operations as a result.

Securing Employee Identities: Expert Tips for Identity Management Day 2025

Apr 10, 2025 10:13:28 AM By Stu Sjouwerman

With this week being Identity Management Day on April 8th, it's the perfect reminder for organizations to focus on protecting their employees' digital identities.

Russian Threat Actor Launches Spear-Phishing Campaign Against Ukrainians

Apr 10, 2025 10:13:12 AM By Stu Sjouwerman

The Russian threat actor Gamaredon is targeting Ukrainians with spear-phishing documents related to troop movements, according to researchers at Cisco Talos.

[HEADS UP] North Korea Expands Its Fraudulent IT Worker Operations

Apr 9, 2025 9:10:47 AM By Stu Sjouwerman

North Korea’s fraudulent employment operations have expanded to hit countries around the world, with a particular focus on Europe, according to researchers at Google’s Threat Intelligence ...

CyberheistNews Vol 15 #14 [Heads Up] QR Code Phishing is Getting More Stealthy Fast

Apr 8, 2025 9:00:00 AM By Stu Sjouwerman

Your KnowBe4 Compliance Plus Fresh Content Updates from March 2025

Apr 7, 2025 10:20:24 AM By Stu Sjouwerman

Check out the March updates in Compliance Plus so you can stay on top of featured compliance training content.

Upgraded Phishing-as-a-Service Platform Drives a Wave of Smishing Attacks

Apr 7, 2025 10:19:19 AM By Stu Sjouwerman

A phishing-as-a-service (PhaaS) platform dubbed ‘Lucid’ is driving a surge in SMS phishing (smishing) attacks, according to researchers at Prodaft.

Online Gaming Platform Steam Tops List of Most Imitated Brands For the First Time

Apr 7, 2025 10:18:53 AM By Stu Sjouwerman

Steam was the most impersonated brand in phishing attacks during the first quarter of 2025, according to a new report from Guardio. The researchers note that the gaming platform’s surge ...

Your KnowBe4 Fresh Content Updates from March 2025

Apr 4, 2025 10:16:15 AM By Stu Sjouwerman

Check out the 58 new pieces of training content added in March, alongside the always fresh content update highlights, new features and events.

Phishing Attacks Lead to Theft in the Shipping Industry

Apr 3, 2025 1:19:14 PM By Stu Sjouwerman

Phishing attacks are driving a surge in “double brokering” scams in the shipping industry, according to Christian Reilly, Cloudflare’s Field CTO for EMEA.

[Heads Up] QR Code Phishing is Getting More Stealthy Fast

Apr 3, 2025 1:18:58 PM By Stu Sjouwerman

Attackers are using new tactics in QR code phishing (quishing) attacks, according to researchers at Palo Alto Networks’ Unit 42.

Most Phishing Emails Rely Purely on Social Engineering

Apr 1, 2025 4:39:10 PM By Stu Sjouwerman

99% of phishing emails that reached inboxes last year did not contain malware, according to a new report from Fortra.

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