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

The Nightmare of Exploits Past. How Phishing Attacks Use Old Vulnerabilities

May 28, 2016 11:57:16 AM By Stu Sjouwerman

By Eric Howes, KnowBe4's Principal Lab Researcher Remember .PIF files? If you're like us, the extension probably rings a bell somewhere deep in the dustiest recesses of your mind -- the ...

Scam Of The Week: Summer Olympics Canceled in Rio

May 28, 2016 10:29:28 AM By Stu Sjouwerman

Heads-up! There is a spike in phishing attacks with Summer Olympics themes, and in the coming months the bad guys are going to be all over this. Kaspersky Labs researchers are reporting ...

Microsoft Alert: ZCryptor Ransomware With Worm Feature

May 27, 2016 9:56:04 AM By Stu Sjouwerman

Microsoft released an alert about a new ransomware strain called ZCryptor, which works like a worm and spreads via removable and network drives. The MalwareForMe blog reported this first ...

Shields Up! New DMA Locker V4 Unleashes Major Ransomware Assault

May 25, 2016 5:10:28 PM By Stu Sjouwerman

DMA Locker is an excellent example of cybercrime's furious speed of innovation. Version 1 showed up in January 2016, and V2 a month later, but the implementation of the encryption ...

Massive Locky Ransomware Campaign Targets Amazon Users

May 25, 2016 3:20:34 PM By Stu Sjouwerman

Comodo Threat Research Labs just posted an alert that a massive campaign of phishing emails have been sent with a spoofed "from" address: auto-shipping@amazon.com. The subject is “Your ...

CyberheistNews Vol 6 #21 [ALERT] This New Ransomware Strain Adds DDoS Bot Causing More Damage

May 23, 2016 8:38:51 AM By Stu Sjouwerman

[ALERT] Cerber Ransomware Strain Adds DDoS Bot Causing More Damage

May 22, 2016 2:12:49 PM By Stu Sjouwerman

Excuse my French, but Holy S#!+, some ransomware developers have created a new evil way to monetize their operations by adding a DDoS component to their malicious payloads. Security ...

Scam Of The Week: LinkedIn Email Change Your Password

May 21, 2016 10:33:05 AM By Stu Sjouwerman

You probably remember the 2012 LinkedIn data breach. It was a big deal because something like 6.5 million user account passwords were posted online, but LinkedIn never confirmed the final ...

"What methodologies does KnowBe4 use in developing our training?"

May 20, 2016 4:27:44 PM By Stu Sjouwerman

Someone interested in using our integrated platform for training and phishing asked us: ""What methodologies does KnowBe4 use in developing our training?" We use the ARCS Model. ARCS is ...

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 ...

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