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.

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Malicious IQY Files Found in Spam Campaign

Mar 16, 2020 8:26:37 AM By Stu Sjouwerman

Researchers at Lastline have come across a phishing campaign that’s using Internet Query (IQY) files to bypass security filters and deliver a new version of the Paradise ransomware. The ...

Extreme Measures: The Epidemic of COVID-19 Phishing Emails Rages On

Mar 16, 2020 7:02:25 AM By Stu Sjouwerman

Since the publication of our first two blog pieces documenting the flood of Coronavirus-themed emails (see HERE and HERE), customers using the Phish Alert Button (PAB) have continued to ...

Hackers Use Interactive Malicious COVID-19 Map to Spread Malware

Mar 14, 2020 10:44:24 AM By Stu Sjouwerman

Cybercriminals constantly latch on to news items that captivate the public’s attention, but usually they do so by sensationalizing the topic or spreading misinformation about it. ...

U.S. Homeland Security: "Malicious Actors Expected To Focus Attacks On Teleworkers. Secure Your VPN"

Mar 14, 2020 9:55:44 AM By Stu Sjouwerman

The Department of Homeland Security's cybersecurity agency this week shared tips on how to properly secure enterprise virtual private networks (VPNs) seeing that a lot of organizations ...

Keeping our employees and partners safe during #coronavirus

Mar 13, 2020 4:20:16 PM By Stu Sjouwerman

Our top priority remains the health and safety of our Knowsters, and we also have a responsibility to support partners and the local community in all the countries we operate.

FBI: Ransomware Attacks Have Cost Victims over $140 Million With Ryuk Leading the Way

Mar 13, 2020 3:12:17 PM By Stu Sjouwerman

New details presented at RSA 2020 outline which ransomware variants are the highest paid over the last 6 years and what was their share of the millions paid in ransom.

U.K. Pensions Regulator Sees 145 Percent Increase in Malicious Email Activity

Mar 13, 2020 8:21:15 AM By Stu Sjouwerman

The U.K. Government’s massive jump in email-based cyberattacks far outpaces even the most aggressive phishing or spam growth numbers seen this year.

[Heads Up] Your Exfiltrated Ransomware Data Is Now Used To Spearphish Your Business Partners

Mar 12, 2020 1:26:41 PM By Stu Sjouwerman

Ransomware operators are continually improving their tactics to ensure more lucrative payouts, according to Information Security Media Group (ISMG). Over the past several years, attackers ...

[Heads Up!] A Whopping 21 Percent of Phishing Attack URLs Are Not Detected As Malicious For Days After They Go Live

Mar 12, 2020 7:03:09 AM By Stu Sjouwerman

New data from Akamai provides insight into why phishing attacks are making it all the way to the endpoint… and why they can trick users so easily into becoming a victim.

A Look at Email Security in the US Healthcare Sector

Mar 11, 2020 8:24:41 AM By Stu Sjouwerman

90% of US healthcare organizations experienced email-based attacks in the past year, and 25% of these organizations said the attacks were extremely or very disruptive, according to a new ...

Ransomware Attack on Police Department Encrypts Evidence, Sets Criminals Free

Mar 10, 2020 10:01:57 AM By Stu Sjouwerman

Holding data for ransom often has business repercussions beyond just delays and inconvenience. In the case of a police investigation, it’s putting criminals back on the street.

Cyberattacks on MSPs Grow Exponentially as the Focus Shifts to Hold Their Customer’s Data for Ransom

Mar 10, 2020 9:56:37 AM By Stu Sjouwerman

Recent insight from data protection vendor Datto puts MSPs on notices to secure their own environments to protect both their business and that of their customers.

CyberheistNews Vol 10 #11 [Heads-Up] New Ransomware Strain Evades AV and Injects Malicious Code Right Into Windows Explorer Process

Mar 10, 2020 9:21:19 AM By Stu Sjouwerman

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Stu Sjouwerman

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Recent Posts

Malicious IQY Files Found in Spam Campaign

Extreme Measures: The Epidemic of COVID-19 Phishing Emails Rages On

Hackers Use Interactive Malicious COVID-19 Map to Spread Malware

U.S. Homeland Security: "Malicious Actors Expected To Focus Attacks On Teleworkers. Secure Your VPN"

Keeping our employees and partners safe during #coronavirus

FBI: Ransomware Attacks Have Cost Victims over $140 Million With Ryuk Leading the Way

U.K. Pensions Regulator Sees 145 Percent Increase in Malicious Email Activity

[Heads Up] Your Exfiltrated Ransomware Data Is Now Used To Spearphish Your Business Partners

[Heads Up!] A Whopping 21 Percent of Phishing Attack URLs Are Not Detected As Malicious For Days After They Go Live

A Look at Email Security in the US Healthcare Sector

Ransomware Attack on Police Department Encrypts Evidence, Sets Criminals Free

Cyberattacks on MSPs Grow Exponentially as the Focus Shifts to Hold Their Customer’s Data for Ransom

CyberheistNews Vol 10 #11 [Heads-Up] New Ransomware Strain Evades AV and Injects Malicious Code Right Into Windows Explorer Process

Cruel Hoax Scams Elderly Woman

Ransomware Predicted to Cost $20 Billion in Damages Globally by 2021

February Content Update: Including Season 2 of Netflix-Style Series 'The Inside Man'

New Norton LifeLock Phishing Scam Installs Remote Access Trojan

Yet Another Utility Company Falls Victim to Ransomware Attack

Stealthy 'Netwalker' Ransomware Using Windows Explorer And 'Art of Deception' To Infect Enterprise Networks

Did you know that KnowBe4 provides Managed Phishing Services?

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