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

What does a "Human Firewall" look like, anyway?

May 20, 2016 3:38:11 PM By Stu Sjouwerman

By Eric Howes, KnowBe4's Principal Lab Researcher So you've subscribed to Security Awareness Training that includes training modules as well as simulated phishing campaigns for your ...

We just received the ultimate in weird nested malware

May 20, 2016 11:05:37 AM By Stu Sjouwerman

Last night a customer sent us a phish via the KnowBe4 Phish Alert Button ( free download here) that must win some kind of award for the longest chain of required user interactions -- all ...

How To Stop Your Ex-Girlfriend Sending Nude Photos To A Fake Facebook Profile

May 20, 2016 8:14:37 AM By Stu Sjouwerman

In a case of sophisticated social engineering, a fraudster created a fake profile of actor Vincent Gallo. He then proceeded to engage in a 2-month long scam, flirting online and sending ...

TeslaCrypt Gives Up and Releases Master Decryption Key

May 19, 2016 4:52:39 PM By Stu Sjouwerman

Larry Abrams from the Bleepingcomputer site noted: "In a surprising end to TeslaCrypt, the developers shut down their ransomware and released the master decryption key. Over the past few ...

Tech Support Scammers start locking Windows PCs

May 19, 2016 10:27:06 AM By Stu Sjouwerman

Tech support scammers have come up with a new way to trick users into sharing their payment card information: screen lockers showing fake Windows alerts telling users that their Windows ...

[ALERT] Fraudsters Steal Tax, Salary Data From ADP. Are Employees At Risk?

May 18, 2016 10:33:03 AM By Stu Sjouwerman

It turns out that HR giant ADP, which provides payroll, tax and benefits administration for more than 640,000 companies, was vulnerable to an ID theft scam. The criminal hackers made off ...

CyberheistNews Vol 6 #20 [ALERT] New Evil Android Phishing Trojans Empty Your Bank Account

May 16, 2016 8:53:58 AM By Stu Sjouwerman

Scam Of The Week: Bogus IT Security Company Websites

May 15, 2016 3:46:50 PM By Stu Sjouwerman

Tech Support Scams are nothing new, but the bad guys are furiously innovating and there is a new variation you need to warn your users about. A few years ago this started out with bogus ...

This Has Been A Crazy Week In Ransomware

May 14, 2016 3:04:08 PM By Stu Sjouwerman

That's what Larry Abrams from Bleepingcomputer started out with yesterday, and he was right! We have had six new ransomware strains, one new RaaS (Ransomware-as-a-Service) and one major ...

What Is The #1 Cause Of Healthcare Data Breaches?

May 14, 2016 10:00:51 AM By Stu Sjouwerman

As a new story about hospital ransomware or a stolen laptop containing PHI seemingly emerges every day, it comes as no surprise that healthcare data breaches have steadily increased in ...

Poll Results: "Should Someone Who Falls For A W-2 Phishing Attack Be Fired?"

May 14, 2016 9:15:38 AM By Stu Sjouwerman

It's an interesting question, because the specific circumstances were explained in an article about this particular incident. There were 186 answers to this poll, and here are the results ...

Ransomware and CEO Fraud Dominate 2016

May 13, 2016 11:31:13 AM By Stu Sjouwerman

An interesting Q1-16 threat report from the folks at Proofpoint. Every day, they analyze more than 1 billion email messages, hundreds of millions of social media posts, and more than 150 ...

New Petya Comes Loaded with Double-Barrel Ransomware Attack

May 13, 2016 10:04:42 AM By Stu Sjouwerman

A new twist on the Petya ransomware and how it now uses a backup ransomware attack. Remember, Petya is a new type of ransomware that doesn’t encrypt specific files but makes the entire ...

New evil android phishing trojans empty your bank account

May 12, 2016 7:29:31 AM By Stu Sjouwerman

Infragard warned that the FBI has identified two Android malware families, SlemBunk and Marcher, actively phishing for specified US financial institutions’ customer credentials. The ...

Congress warned about cybersecurity after attempted ransomware attack on House

May 11, 2016 1:20:13 PM By Stu Sjouwerman

In an email provided to TechCrunch, the House technology service desk warned representatives of increased ransomware attacks on the House network. The email warns that attackers are ...

CyberheistNews Vol 6 #19 Scam Of The Week: Hidden Dangers Of HTML Attachments

May 10, 2016 9:18:20 AM By Stu Sjouwerman

InfoSec Analyst: "We Make People Suck At IT Security"

May 7, 2016 2:02:37 PM By Stu Sjouwerman

IT Security analyst Ben Tomhave calls himself an infosec obsessive and I admire his insightful analyses when they appear. This time he commented on the recent attacks that followed the ...

Prince Death Overdose Caught On Video! Stolen out of a spear phishing attack?

May 7, 2016 11:07:32 AM By Stu Sjouwerman

Our CTO was picking up some groceries and saw this at the check-out, stolen straight out of a spear phishing email... or was it? LOL.

The Hidden Dangers of .HTML Attachments

May 7, 2016 4:00:00 AM By Stu Sjouwerman

By Eric Howes, KnowBe4's Principal Lab Researcher Over the past six to nine months .DOC and .JS file attachments have dominated the news surrounding the rise in phishing attacks. The ...

Troy, Mich Investment Firm Loses $500,000 in CEO Fraud

May 6, 2016 11:37:18 AM By Stu Sjouwerman

An employee at a Troy, Mich., investment firm fell for a CEO Fraud attack and was social engineered into transferring almost $500,000 to a Hong Kong bank. The error was noticed eight days ...

Security Awareness Training Blog

View Topics