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

A Short History & Evolution of Ransomware

Apr 17, 2016 4:44:24 PM By Stu Sjouwerman

Ransomware attacks cause downtime, data loss, possible intellectual property theft, and in certain industries a ransomware attack is now looked at as a possible data breach. Ransomware is ...

CTB-Locker Ransomware Uses Blockchain to Store & Deliver Decryption Keys

Apr 16, 2016 4:48:21 PM By Stu Sjouwerman

A mysterious update in the behavior of the CTB-Locker ransomware strain alerted security researchers to pull some strings and see what was going on. The CTB-Locker ransomware family, ...

Ransomware On Pace To Be A 2016 $1 Billion Dollar Business

Apr 16, 2016 10:34:21 AM By Stu Sjouwerman

CNN Money reports about new estimates from the FBI that show the costs of ransomware have reached an all-time high this year. Threat actors made $209 million in the first quarter of 2016 ...

Phishing Attacks Hit the C-Suite With High Value Scams [INFOGRAPHIC]

Apr 16, 2016 9:00:38 AM By Stu Sjouwerman

OK, here is great ammo to get more IT security budget. Why? This article and infographic make it real to the C-suite that they themselves have a big phishing target on their back. You all ...

US Company Falls Victim To $100 Million CEO Email Fraud

Apr 15, 2016 8:08:36 AM By Stu Sjouwerman

An as yet unknown American company fell victim to nearly $100 million in CEO Fraud. Employees were social engineered by spoofed emails that claimed to be one of its legitimate vendors, ...

They Shoot Files, Don't They? Jigsaw Ransomware Does...

Apr 14, 2016 11:07:29 AM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. A few days ago our friends at BleepingComputer.com announced the discovery of a new form of ransomware, which they dubbed Jigsaw ...

The Future Of Ransomware: CryptoWorms?

Apr 12, 2016 2:52:36 PM By Stu Sjouwerman

Cisco's Talos Labs researchers had a look into the future and described how ransomware would evolve. It's a nightmare. They created a sophisticated framework for next-gen ransomware that ...

Exciting New Features In KnowBe4 Spring 2016 Release

Apr 12, 2016 8:47:40 AM By Stu Sjouwerman

We have several cool new features in the Spring 2016 release! These features were previously out of reach for IT managers with limited budget, and we're excited you can use them now with ...

CyberheistNews Vol 6 #15 [FBI ALERT] Dramatic Increase In Email CEO Fraud To 2.3 Billion.

Apr 12, 2016 8:44:05 AM By Stu Sjouwerman

*|CyberHeistNews|*

CryptoHost Ransomware Locks Files In A Password Protected RAR File

Apr 10, 2016 6:42:50 PM By Stu Sjouwerman

A new ransomware strain called CryptoHost was discovered, which claims that it encrypts your data and then demands a ransom of .33 bitcoins to get your files back (~140 USD at the current ...

Hello mass spear phishing, meet ransomware!

Apr 9, 2016 11:15:40 AM By Stu Sjouwerman

Ransomware is now one of the greatest threats on the internet. In the past, IT Security firms used to monitor spear-phishing attacks by espionage outfits, but these techniques are now ...

How Mattel Lost $3M In CEO Fraud Phishing

Apr 9, 2016 8:29:52 AM By Stu Sjouwerman

Great story by Erika Kinetz at the Associated Press. How Mattel was the victim of CEO Fraud using phishing and social engineering to trick one of their executives in China to make a $3 ...

Maktub Ransomware Knows Where You Live

Apr 9, 2016 7:58:27 AM By Stu Sjouwerman

It's happening in the UK today, and you can expect it in America tomorrow [correction- it's already happening today]. The bad guys in Eastern Europe are often using the U.K. as their beta ...

KnowBe4 Gets 1st place for the Tampa Best Places To Work

Apr 8, 2016 11:45:28 AM By Stu Sjouwerman

We're stoked here. We got 1st place for the Tampa Best Places To Work - small business category!!! The Tampa Bay Times has a yearly "Best Places To Work" contest, and surveys the ...

Users Really Do Plug in USB Drives They Find

Apr 8, 2016 7:22:18 AM By Stu Sjouwerman

Been suspecting that your users are plugging in any USB stick they find, to see what is on it? Well, you are right, they actually do that. Fresh scientific research by Google, and the ...

[FBI ALERT] Dramatic Increase in e-mail CEO Fraud To 2.3 Billion.

Apr 6, 2016 2:34:49 PM By Stu Sjouwerman

A brand new Alert by the FBI on April 4th 2016 warns of a major increase in what they call business email compromise or BEC (we call it CEO Fraud), amounting to a whopping $2.3 billion in ...

CyberheistNews Vol 6 #14 Why Hospitals Are Perfect Ransomware Targets. Are You Next?

Apr 5, 2016 9:31:04 AM By Stu Sjouwerman

More About Petya Hard Disk Lock BSoD Ransomware

Apr 3, 2016 11:48:28 AM By Stu Sjouwerman

[UPDATE April 10, 2016] Petya's ransomware's encryption has been defeated and a password generator has been released. See bottom of the post. March 25, news came out about a new type of ...

KnowBe4 Has Blowout First Quarter 2016

Apr 2, 2016 9:19:50 AM By Stu Sjouwerman

KnowBe4, the United States’ most popular integrated platform for security awareness training and simulated phishing tests, announced it attained a top spot (#220) in the Cybersecurity ...

It's CONFIRMED: MedStar Receives A Massive Ransomware Demand

Mar 31, 2016 8:15:40 AM By Stu Sjouwerman

It is now confirmed, The MedStar Hospital Chain was hit with ransomware and has received a digital ransom note. A Baltimore Sun reporter has seen a copy of the cybercriminal's demands. ...

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