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

Who Is Learning How to Take Down the Internet?

Oct 24, 2016 10:00:00 AM By Stu Sjouwerman

It was all over the news. A sustained DDoS attack that caused outages for a large number of Web sites Friday was launched with the help of hacked “Internet of Things” (IoT) devices. Jeff ...

CyberheistNews Vol 6 #43 Who Is Learning How To Take Down The Internet?

Oct 24, 2016 9:50:26 AM By Stu Sjouwerman

Researchers discover new malicious IoT worm

Oct 24, 2016 7:54:54 AM By Stu Sjouwerman

Researchers at RapidityNetworks discovered a new malicious worm using Telnet that infects IoT devices using their insecure default credentials and uses a peer-to-peer network to install ...

Ransomware Strain Count Surpasses 200

Oct 22, 2016 6:47:53 PM By Stu Sjouwerman

Michael Gillespie tweeted: "Whew! ID #Ransomware can now identify 200 ransomware families. :) Sad such a milestone was hit so quickly..." He added a list from the malwarehunterteam site, ...

The New Posterboy of CyberInsecurity: John Podesta Fell For Social Engineering Attack

Oct 22, 2016 10:26:56 AM By Stu Sjouwerman

Motherboard has a great article explaining just how Podesta, Chairman of the 2016 Hillary Clinton presidential campaign got hacked. (Podesta previously served as Chief of Staff to ...

A Slick Phish with a Hidden Surprise

Oct 20, 2016 4:44:22 PM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. Yesterday one of our customers was hit with a highly targeted phishing attack -- one of the slicker attacks we've seen in a while. Once we ...

"My AV blocked RanSim.exe So I'm Safe" No You Are Not

Oct 20, 2016 10:32:11 AM By Stu Sjouwerman

I'm noticing a lot of people saying the ransim.exe file is getting blocked by your AV. You have to actually allow the initial processes to run to do the simulation. It is the five test ...

CyberheistNews Vol 6 #42 How Vulnerable Is Your Network? Download The New Ransomware Simulator.

Oct 18, 2016 9:29:11 AM By Stu Sjouwerman

Python Ransomware Uses A Unique Key For Each File That Is Encrypted

Oct 15, 2016 10:33:23 AM By Stu Sjouwerman

A new ransomware strain written in Python called CryPy was disclosed by Avast malware analyst Jakub Kroustek. It seems that Pyton is getting more popular as a ransomware development ...

Yahoo Hack Triggers 'Material Adverse Change' Clause

Oct 14, 2016 7:52:34 AM By Stu Sjouwerman

The Wall Street Journal reported that Verizon's lawyers are looking at using the "material adverse clause' to renegotiate the terms of the $4.8 billion deal they struck on July. Verizon’s ...

More than 60% of US office workers are unaware of the ransomware threat

Oct 13, 2016 8:26:51 AM By Stu Sjouwerman

Nearly half of ransomware attacks are aimed at office workers, but almost two-thirds of those polled are unaware of the threat More than 60% of US office workers are unaware of ransomware ...

[ALERT] Scam Of The Week: Brad Pitt Found Dead (Suicide)

Oct 13, 2016 7:04:23 AM By Stu Sjouwerman

The divorce between Brad Pitt and Angelina Jolie has been used by the bad guys for a "celebrity death hoax" which unfortunately is high-grade click bait. It's the most recent one to hit ...

AI-powered ransomware is coming, and it's going to be terrifying

Oct 12, 2016 8:09:30 AM By Stu Sjouwerman

Business Insider started an article with the following: "Imagine you've got a meeting with a client, and shortly before you leave, they send you over a confirmation and a map with ...

CyberheistNews Vol 6 #41 Scam Of The Week: Insidious New IRS Social Engineering Attack

Oct 11, 2016 9:34:49 AM By Stu Sjouwerman

October Is The Time To Kill Old-School Security Awareness Training

Oct 10, 2016 1:00:03 PM By Stu Sjouwerman

CSO had an excellent article that states the case that you need to get rid of old-school awareness training which you do for compliance reasons only. Their photo illustration was funny as ...

Scam Of The Week: Insidious New IRS Social Engineering Attack

Oct 10, 2016 10:13:00 AM By Stu Sjouwerman

There is a new insidious IRS scam that you need to warn your employees, friends and family about, and inform your HR department to start with. Seasoned internet criminals are sending ...

KnowBe4 beats stellar Q2 and grows 369% YoY in Q3

Oct 9, 2016 1:03:59 PM By Stu Sjouwerman

(Tampa Bay, FL) October 9, 2016 --- KnowBe4 is excited to announce we were able to beat our stellar Q2, and maintain our explosive year over year growth, Q3 2016 being 369% over Q3 2015. ...

Did You Know That Ransomware Can Stop SQL So It Can Encrypt The Database?

Oct 9, 2016 12:10:52 PM By Stu Sjouwerman

I have been knee deep into Ransomware since September 2013 when the granddaddy of modern ransomware CryptoLocker made well over 20 million bucks in a few months. But sometimes I learn ...

The 7 Levels Of Hackers

Oct 9, 2016 7:35:54 AM By Stu Sjouwerman

Eric Chabrow over at the Government Info Security blog found an interesting post by Stuart Coulson, who is a director of a hosting provider in the U.K. Coulson wrote a somewhat longish ...

Massive Cerber Ransomware Campaign Flooding Your Employees' Inboxes

Oct 5, 2016 6:18:50 AM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. This Monday morning many of our customers came in to work to find a rather rude surprise lurking in their inboxes: a massive Cerber ...

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