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

Phishing Attack With Malicious Word Doc Changes Proxy Settings

Sep 6, 2016 3:20:31 PM By Stu Sjouwerman

Microsoft recently came across a threat that uses social engineering but delivers a different payload than the usual Office document with macros. Its primary purpose is to change a user’s ...

CyberheistNews Vol 6 #36 [ALERT] A New Criminal Phishing-As-A-Service Steals 688K Credentials

Sep 6, 2016 9:45:14 AM By Stu Sjouwerman

New Cry Ransomware Strain Has Unusual Advanced Features

Sep 6, 2016 7:14:33 AM By Stu Sjouwerman

Larry Abrams at Bleepingcomputer reported on a new strain with a few unusual features: "A new ransomware that pretends to be from a fake organization called the Central Security Treatment ...

Evidence Hillary Was Speared In Phishing Attack

Sep 4, 2016 10:54:54 AM By Stu Sjouwerman

The Smoking Gun reported: "SEPTEMBER 2--The FBI’s Hillary Clinton investigation turned up evidence that her e-mail accounts were targeted in multiple “spear phishing” attacks, one of ...

Criminal Phishing-as-a-Service Platform Steals Credentials

Sep 1, 2016 5:15:25 PM By Stu Sjouwerman

Want someone's credentials? Just social engineer them. Phishing is still responsible for 91% of data breaches and has been for the last few years. A Russian cyber mafia has created a ...

I have an invitation to join a new exciting online community: Hackbusters!

Sep 1, 2016 4:07:39 PM By Stu Sjouwerman

KnowBe4 has been running the HackBusters site for a few years now, providing you with trending IT security news. We are expanding it and have launched a new exciting online community! You ...

Cyberheist Nets 44 Million In Single CEO Fraud Attack

Sep 1, 2016 8:02:02 AM By Stu Sjouwerman

Earlier in August, one of the world's largest cable manufacturers Leoni AG publicly confessed that it had fallen victim to a classic CEO Fraud attack that has cost the company a whopping ...

CrowdStrike: "Russian Hackers Attack DC Think Tanks With Phishing Emails"

Aug 31, 2016 8:13:02 AM By Stu Sjouwerman

The Wall Street Journal reported this morning that "A Russian hacking group linked to a series of computer intrusions at the Democratic National Committee and other organizations is now ...

Two New KnowBe4 Phishing Categories: Scam Of The Week and Reported Phishes of the Week

Aug 29, 2016 5:29:02 PM By Stu Sjouwerman

KnowBe4's Templates Mistress Katie has added two new categories to the System Templates: 1) SCAM OF THE WEEK - this will act as an optional weekly newsletter for you to send to your ...

CyberheistNews Vol 6 #35 Heads-Up! Voice Message Notification Email Warning Could Be Ransomware

Aug 29, 2016 9:50:18 AM By Stu Sjouwerman

IT Security Is A Protoscience, Think 19th Century Chemistry

Aug 28, 2016 2:39:14 PM By Stu Sjouwerman

So I get the Andreessen Horowitz newsletter. It has a topic called "Security is a protoscience (and more on 'so you want to work in security') - Michal Zalewski" I'm intrigued so I click ...

KnowBe4's Field Guide to Macro Warning Screens

Aug 26, 2016 5:29:11 PM By Stu Sjouwerman

Earlier this week today we assisted several companies that were hit by ransomware. Although companies and organizations hit by ransomware can usually pinpoint the source or employee ...

Ransomware & Voicemail Notifications, Redux

Aug 26, 2016 1:18:45 PM By Stu Sjouwerman

Several days ago we posted about a new ransomware campaign pushing Cerber through malicious ZIP files attached to voicemail-themed phishing emails. Fast on the heels of that campaign ...

Here is a Real DDoS Plus Ransomware Extortion Attack

Aug 26, 2016 11:05:24 AM By Stu Sjouwerman

One of our customers received the following email today. It's a clear extortion attempt, they are threatening to execute a combined DDoS and Cerber ransomware attack. These bad guys claim ...

Heads-up! Voice message notification email warning could be ransomware

Aug 24, 2016 2:13:01 PM By Stu Sjouwerman

Don't play voicemail messages from suspicious sources. Example displayed in MS Outlook. Image credit: SANS ISC.

How Highly Personalized Ransomware Attacks Are Getting

Aug 23, 2016 11:40:48 AM By Stu Sjouwerman

CyberheistNews Subscriber Stuart Sanders sent me this: "A friend of mine in Melbourne Australia has been whacked by several crypto attacks on his clients in the last week. He supports ...

CyberheistNews Vol 6 #34 [ALERT] Cerber Ransomware Plague Earns 2 Mil With Just 0.3% Victims Paying Up

Aug 22, 2016 9:44:09 AM By Stu Sjouwerman

Cerber Ransomware Plague Earns 2 Mil With Just 0.3% Victims Paying Up

Aug 21, 2016 8:38:48 AM By Stu Sjouwerman

A new report by Check Point software's researchers showed that Cerber's Ransomware-as-a-Service (RaaS) affiliate program is a success with more than 160 participants at current count, and ...

Clinton Foundation Gets Spear-Phished By Russians, Hires FireEye To Investigate

Aug 18, 2016 7:38:18 AM By Stu Sjouwerman

REUTERS just reported that the Clinton charitable foundation hired the security firm FireEye to examine its network after seeing indications they might have been hacked by Russians, ...

FireEye warns 'massive' Locky ransomware campaign hits America

Aug 18, 2016 6:43:52 AM By Stu Sjouwerman

The dangerous Locky ransomware is being hurled at a variety of industries, healthcare being the number one target, according to FireEye researcher Ronghwa Chong. We have talked about ...

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