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

Report: Phishing Remains the Most Prevalent Cyber Threat

Mar 27, 2025 5:07:44 PM By Stu Sjouwerman

INKY has published its annual report on email security, finding that phishing accounted for 30% of all reported cybercrimes last year.

Amount of Money Requested In BEC Attacks Nearly Doubled in Q4 2024

Mar 26, 2025 3:31:53 PM By Stu Sjouwerman

The average amount of money requested in business email compromise (BEC) attacks spiked to $128,980 in the fourth quarter of 2024, according to the Anti-Phishing Working Group’s (APWG’s) ...

CyberheistNews Vol 15 #12 Key Takeaways from the KnowBe4 2025 Phishing Threat Trends Report

Mar 25, 2025 9:08:44 AM By Stu Sjouwerman

Act Now: Phishing-as-a-Service Attacks are on the Rise

Mar 24, 2025 3:05:34 PM By Stu Sjouwerman

Phishing-as-a-service (PhaaS) platforms drove a surge in phishing attacks in the first two months of 2025, according to researchers at Barracuda.

Hundreds of Malicious Android Apps Received 60 Million Downloads

Mar 21, 2025 10:46:15 AM By Stu Sjouwerman

Bitdefender warns that a major ad fraud campaign in the Google Play Store resulted in more than 60 million downloads of malicious apps.

Phishing Attacks Abuse Microsoft 365 to Bypass Security Filters

Mar 20, 2025 10:27:20 AM By Stu Sjouwerman

Threat actors are abusing Microsoft’s infrastructure to launch phishing attacks that can bypass security measures, according to researchers at Guardz.

Be Vigilant: BEC Attacks Are on the Rise

Mar 19, 2025 9:58:19 AM By Stu Sjouwerman

Business email compromise (BEC) attacks rose 13% last month, with the average requested wire transfer increasing to $39,315, according to a new report from Fortra.

Booking.com Phishing Scam Targets Employees in the Hospitality Sector

Mar 18, 2025 10:25:44 AM By Stu Sjouwerman

A phishing campaign is impersonating travel agency Booking.com to target employees in the hospitality industry, according to researchers at Microsoft.

CyberheistNews Vol 15 #11 [Heads Up] 245% Increase in SVG Files Used to Obfuscate Phishing Payloads

Mar 18, 2025 9:00:00 AM By Stu Sjouwerman

Protect Yourself: Social Engineering Fuels SIM Swapping Attacks

Mar 13, 2025 9:13:20 AM By Stu Sjouwerman

Group-IB has published a report on SIM swapping attacks, finding that attackers continue to use social engineering to bypass technical security measures.

Beware: Malvertising Campaign Hits Nearly a Million Devices

Mar 12, 2025 9:09:33 AM By Stu Sjouwerman

Microsoft warns that a widespread malvertising campaign hit nearly one million devices around the world. The campaign, which began on illegal streaming sites, impacted both consumer and ...

U.S. Justice Department Charges China’s Hackers-for-Hire Working IT Contractor i-Soon

Mar 11, 2025 10:13:11 AM By Stu Sjouwerman

The U.S. Justice Department has charged ten Chinese nationals for acting as hackers-for-hire for the Chinese government.

CyberheistNews Vol 15 #10 [Heads Up] Sophisticated Phishing Attack Uses New JavaScript Obfuscation Trick

Mar 11, 2025 9:11:48 AM By Stu Sjouwerman

Your KnowBe4 Compliance Plus Fresh Content Updates from February 2025

Mar 10, 2025 9:18:18 AM By Stu Sjouwerman

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

Your KnowBe4 Fresh Content Updates from February 2025

Mar 7, 2025 9:17:31 AM By Stu Sjouwerman

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

Warning: Ransomware Threats Increased Fourfold in 2024

Mar 7, 2025 9:14:54 AM By Stu Sjouwerman

Researchers at Barracuda observed a fourfold increase in ransomware threats last year, driven by increasingly sophisticated ransomware-as-a-service (RaaS) operations.

Data at Risk: 96% of Ransomware Attacks Involve Data Theft

Mar 6, 2025 9:54:08 AM By Stu Sjouwerman

A new report from Arctic Wolf has found that 96% of ransomware attacks now involve data theft as criminals seek to force victims to pay up.

[Heads Up] Sophisticated Phishing Attack Uses New JavaScript Obfuscation Trick

Mar 5, 2025 9:11:50 AM By Stu Sjouwerman

Researchers at Juniper Threat Labs warn that phishing attacks are utilizing a new obfuscation technique to hide malicious JavaScript.

CyberheistNews Vol 15 #09 [NEW] KnowBe4 Interviews a Fake North Korean Employee

Mar 4, 2025 9:00:00 AM By Stu Sjouwerman

Protect Yourself from Job Termination Scams

Feb 28, 2025 9:13:46 AM By Stu Sjouwerman

ESET warns of a wave of phishing attacks informing employees that they’ve been fired or let go. The emails are designed to make the user panic and act quickly to see if they’ve actually ...

Security Awareness Training Blog

View Topics