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 World’s Most Impersonated Brand in Phishing Attacks Is… (and it’s NOT Microsoft!)

Jul 29, 2021 2:39:47 PM By Stu Sjouwerman

Despite so much news surrounding phishing attacks pretending to be from Microsoft’s Office 365 platform, a new report from Vade Secure provides a global perspective to impersonation.

Over 700 Ransomware Victim Organizations are Named on Data Leak Sites in Q2

Jul 29, 2021 2:39:39 PM By Stu Sjouwerman

This massive increase in the number of victim organizations being named demonstrates the harsh reality of how far ransomware threat actors will actually go if ransoms aren’t paid.

Image Inversion as a Phishing Technique

Jul 29, 2021 8:53:54 AM By Stu Sjouwerman

Researchers at WMC Global have found that a phishing kit is using images with inverted colors to avoid detection.

Cybercriminals Are Growing More Organized

Jul 28, 2021 9:03:29 AM By Stu Sjouwerman

The cybercriminal underground is becoming increasingly organized, according to researchers at HP. The criminal underground functions like a regular economy, with people selling goods and ...

Warning: A New Ransomware Cartel Has Formed Sharing Techniques, Code, and Infrastructure

Jul 27, 2021 1:16:20 PM By Stu Sjouwerman

In a new twist, security researchers at Analyst1 have identified four Russian ransomware gangs that actively work together to coordinate attacks, data leaks, and more.

U.K. Employees Pose a Major Cybersecurity Risk to Business as They Return to the Office

Jul 27, 2021 1:16:12 PM By Stu Sjouwerman

After well over a year of getting used to working from home, as U.K. employees look to head back into the office, new data shows they don’t see themselves as a cyber risk (which makes ...

77% of Organizations Are Unable to Access Systems or Networks Post-Ransomware Attack

Jul 27, 2021 1:16:03 PM By Stu Sjouwerman

The fallout after a ransomware attack is more devastating than previously thought. New data spells out what you should really expect after being hit with ransomware.

CyberheistNews Vol 11 #29 [Heads Up] New Phishing Threat Infographic: Your Users Are Failing Security and HR-Related Attacks

Jul 27, 2021 9:37:52 AM By Stu Sjouwerman

Phishing Attacks Surged in Q2 2021

Jul 27, 2021 8:37:21 AM By Stu Sjouwerman

Phishing activity increased dramatically in the second quarter of 2021, according to a recent report by Vade. The company observed 4.2 billion phishing emails in June alone.

Milanote Exploited to Host Phishing Content

Jul 26, 2021 9:39:19 AM By Stu Sjouwerman

Researchers at Avanan warn that attackers are exploiting the collaboration and note-taking app Milanote to host phishing links.

Remote Employees Adopt Bad Cybersecurity Habits While Working from Home

Jul 23, 2021 8:24:43 AM By Stu Sjouwerman

A new report focused on businesses looking to bring employees back to the office makes it very clear that security leaders are concerned, as remote workers have been anything but secure.

U.S. State Department Issues a Reward for Information on Foreign Cybercriminals Targeting Critical Infrastructure

Jul 23, 2021 8:24:29 AM By Stu Sjouwerman

In the wake of cyberattacks targeting U.S. infrastructure organizations, the U.S. government is stepping up measures to identify foreign threat actors and bring them to justice.

Updated Ransomware Simulator Now With 23 Latest Infection Scenarios

Jul 23, 2021 8:00:00 AM By Stu Sjouwerman

As ransomware techniques continue to evolve, two new ransomware strains, DearCry and Black Kingdom, were blamed for the huge Microsoft Exchange server attacks earlier this year, which ...

Microsoft Takes Down Homoglyph Domains

Jul 22, 2021 10:44:51 AM By Stu Sjouwerman

Microsoft has taken legal action to shut down eighteen domains that were being used in business email compromise (BEC) attacks. The sites in question used homoglyphs to impersonate ...

[HEADS UP] 2021 Tokyo Olympics Mean Olympic-Themed Phishing Attacks

Jul 21, 2021 8:59:13 AM By Stu Sjouwerman

Last year, we reported that authorities warned of the Tokyo Olympics phishing attacks. Then the global pandemic occurred, and the games were postponed. Well, now the games have ...

Mint Mobile, Porting Numbers, and Identity Theft

Jul 21, 2021 8:47:55 AM By Stu Sjouwerman

US telecommunications company Mint Mobile warned some users that their phone numbers had temporarily been ported to another carrier by an unauthorized individual, which allowed the ...

Microsoft Continues to be the Top Impersonated Brand in Phishing Attacks

Jul 20, 2021 9:58:29 AM By Stu Sjouwerman

New data from CheckPoint identifies those brands being used by threat actors to trick victims into opening attachments, clicking links, providing credentials, and giving up personal ...

The Cost and Impact of Cybercrime Can Now Be Measured in a Single Minute

Jul 20, 2021 9:57:55 AM By Stu Sjouwerman

With the number of threat actors growing rapidly, along with an increased frequency of attacks, RiskIQ has put together a sobering perspective of how cybercrime impacts us in just 60 ...

CyberheistNews Vol 11 #28 [HEADS UP] Live Phishing Attack Uses New Infection Technique to Deliver Malware

Jul 20, 2021 9:46:36 AM By Stu Sjouwerman

[INFOGRAPHIC] New Report Shows Users Are Falling for Security and HR-Related Phishing Attacks

Jul 19, 2021 5:04:04 PM By Stu Sjouwerman

KnowBe4's latest quarterly report on top-clicked phishing email subjects is here. These are broken down into three different categories: social media related subjects, general subjects, ...

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