KnowBe4 Blog

Keeping you informed. Keeping you aware.
Stay on top of the latest in human and agent security including social and prompt engineering, ransomware and phishing attacks.

Stu Sjouwerman

Founder and Executive Chairman

Stu Sjouwerman (pronounced “shower-man”) is the Founder and Executive Chairman 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.


Recent Posts

Canadian Government Urges Organizations to Take Additional Steps to Protect Against Ransomware Attacks

Citing upticks in attacks, Canada’s Centre for Cyber Security asks organizations to step up protective measures, offering guidance and a playbook to improve security.

With KnowBe4’s Phish Alert Button, You Can Now Collect Feedback from Your Users When They Report Suspicious Emails

We are excited to announce the availability of KnowBe4’s enhanced Phish Alert Button for Microsoft 365 with the new User Comments feature!

Phishing Campaign Impersonates Pfizer

A phishing campaign is impersonating Pfizer with phony request-for-quotation (RFQ) emails, according to Roger Kay at INKY. The email lures had fairly convincing PDF attachments that ...

Phishing Remains Top Form of Cybersecurity Breach in 2021

Over half of organizations say they’ve experienced a cybersecurity breach caused by phishing in the last 12 months, dwarfing the second-place breach cause (malware) by almost 30%.

Double Extortion Ransomware Attacks That Publish Victim Data Increase 935%

According to new data, the number of victim companies impacted by double extortion has jumped from 229 by the first half of 2020 to nearly 2400 by the first half of 2021.

Embedded Email Attacks Are on the Rise and Aren’t Being Detected by Security Solutions

This classic tactic is making a comeback and is elegantly simple to execute, yet sufficiently complex enough to keep email scanning solutions from seeing it as malicious.

Spam Calling Rates Spike Globally

Spam calls in the US spiked in October, according to Truecaller’s annual Global Spam Report. The report observed that Truecaller customers in the US received 3,115,861 spam calls in ...

Whitelisting On Known Headers Not Recommended

We found a discussion on Twitter about this topic and we thought it would be useful to provide to provide the correct technical background related to whitelisting.

[EYE OPENER] New EU Phishing Study Shows That Crowd-sourcing Phishing Defense Is Successful

A Swiss phishing study involving roughly 15,000 participants in a 15-month experiment produced some interesting results. The study was run by researchers at ETH Zurich, working together ...