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

Lessons Learned From Vishing Robocall Attacks In Mandarin

Oct 31, 2019 6:49:00 AM By Stu Sjouwerman

Among the specialized forms of vishing are those that target specific language communities. Chinese-speaking people in the US and around the world are increasingly being targeted with ...

Ransomware Attack Causes School 'District-Wide Shutdown'

Oct 30, 2019 6:51:58 AM By Stu Sjouwerman

A ransomware attack hitting Las Cruces Public Schools forced the district to shut down the entire computer system to contain the infection.

Vishing, from (not) the Bank

Oct 30, 2019 5:59:59 AM By Stu Sjouwerman

We saw yesterday how phishing affects the financial sector. Here we see another, related trend: impersonation attacks that purport to be from the victim’s bank.

CyberheistNews Vol 9 #44 [INFOGRAPHIC] The 2019 Third Quarter Top-Clicked Phishing Email Subjects From KnowBe4

Oct 29, 2019 3:06:41 PM By Stu Sjouwerman

[NEW FEATURE] KnowBe4 Assessments Help Gauge Proficiency of Your Users in Security Awareness and Sentiment Towards Security Culture

Oct 29, 2019 8:56:36 AM By Stu Sjouwerman

Social engineering attacks continue to be the leading cause of compromised networks and data breaches. Today, organizations of all sizes are susceptible to these attacks and are ...

A Recent Spate Of Spear Phishing Attacks Is Targeting The Financial Industry

Oct 29, 2019 6:45:30 AM By Stu Sjouwerman

Phishing attacks are getting harder to spot, especially as more attackers realize the value of targeted, well-crafted phishing attacks, according to Johannes Ullrich, the dean of research ...

Phishing Attack Targets Humanitarian Organizations

Oct 28, 2019 7:01:01 AM By Stu Sjouwerman

Researchers at Lookout have discovered an ongoing phishing campaign targeting humanitarian non-governmental organizations (NGOs), including UNICEF and the Red Cross. The infrastructure ...

Phishing in Office 365's Pond

Oct 28, 2019 6:55:35 AM By Stu Sjouwerman

Heimdal Security has come across a phishing campaign that uses compromised accounts to target Microsoft users. The attackers use email and social media accounts they’ve already breached ...

Data Breaches Devastate Small Businesses in 2019 with 10 Percent Closing Their Doors

Oct 24, 2019 2:07:25 PM By Stu Sjouwerman

A new report from the National Cyber Security Alliance sheds some light on how prepared small and medium size businesses are and what the aftermath of a data breach really looks like.

FBI Updates Initiative to Protect U.S. Elections from Cyberattacks

Oct 24, 2019 7:14:35 AM By Stu Sjouwerman

FBI has updated and expanded the resources and tools designed to help political campaigns, private businesses, and individuals to better understand and mitigate risks posed by foreign ...

CNN Says "Hack Our Reporter," and White Hat Rachel Tobac Does

Oct 24, 2019 6:54:14 AM By Stu Sjouwerman

It’s “disturbingly easy” to steal someone’s personal data using information gleaned from their social media accounts, according to Donie O’Sullivan at CNN. O’Sullivan met with Rachel ...

Credential Phishing With a Masked URL

Oct 23, 2019 5:55:49 AM By Stu Sjouwerman

Cofense warns of a phishing campaign going after credentials for the Stripe online payment platform. The attackers are sending emails purporting to be from Stripe Support, telling the ...

CyberheistNews Vol 9 #43 [Heads-Up] "I Can Phish Anyone". Would You Be Able to Say This, and Would You Be Right?

Oct 22, 2019 9:42:27 AM By Stu Sjouwerman

Q3 2019 Top-Clicked Phishing Email Subjects from KnowBe4 [INFOGRAPHIC]

Oct 22, 2019 7:28:00 AM By Stu Sjouwerman

KnowBe4 reports on the top-clicked phishing emails by subject lines each quarter in three different categories: subjects related to social media, general subjects, and 'In the Wild' - we ...

A New Strain of Tech Support Scam in the U.K.

Oct 22, 2019 6:54:11 AM By Stu Sjouwerman

The BBC reports a tech support scam that caused a British man, Doug Varey, to lose £4,000. The scam began when Mr. Varey saw an online ad for twelve years’ worth of computer security ...

Smishing and Carrier Impersonation

Oct 22, 2019 6:47:08 AM By Stu Sjouwerman

While most phishing campaigns involve email, SMS text messages are an ideal alternative for attackers, according to Paul Ducklin at Naked Security. Text messages are brief and uniform in ...

Shipping giant Pitney Bowes hit by ransomware

Oct 21, 2019 4:26:59 PM By Stu Sjouwerman

TechCrunch reported that shipping tech giant Pitney Bowes has confirmed a cyberattack on its systems.

Alexa and Google Home abused to eavesdrop and phish passwords

Oct 21, 2019 9:35:05 AM By Stu Sjouwerman

Ars Technica is on a roll lately with some very good articles! Here is another one that made me go "Yikes!"

Can An Employee's Bad Conscience Be A Vulnerability?

Oct 21, 2019 7:06:27 AM By Stu Sjouwerman

It can be useful to remember that social engineering succeeds much better when its marks are stressed or hurried. That appears to be the case with an ongoing scam campaign that lays its ...

KnowBe4 Wins ComputingSecurity Award: Education and Training Provider of the Year

Oct 18, 2019 9:43:51 AM By Stu Sjouwerman

We are extremely pleased to announce we won the ComputingSecurity Award for Education and Training Provider of the Year. Here is the team accepting the award.

Security Awareness Training Blog

View Topics