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

Catphish and Honey Traps

Feb 19, 2020 8:25:28 AM By Stu Sjouwerman

Hundreds of Israeli soldiers had their phones compromised by malware after falling for catfishing attacks purportedly launched by Hamas, Forbes reports. The Israel Defense Forces (IDF) ...

A U.S. Natural Gas Operator Shuts Down For 2 Days After A Phishing Attack Infects It With Ransomware

Feb 19, 2020 6:29:18 AM By Stu Sjouwerman

Dan Goodin at Ars Technica reported something worrisome: "A US-based natural gas facility shut down operations for two days after sustaining a ransomware infection that prevented ...

Over 500 Browser Extensions Secretly Stealing Millions of Users Private Data Yanked From Chrome Store

Feb 19, 2020 5:59:07 AM By Stu Sjouwerman

Unfortunately, cyber criminals never stop their innovation. Now they have come up with a novel method to both poison Google's extension ecosystem, combined with social engineering tactics ...

New Convincing Verizon Smishing Scam Makes SIM Swaps A Breeze

Feb 18, 2020 1:42:27 PM By Stu Sjouwerman

Cybercriminals intent on using a mobile device as a second factor of authentication are now using texts and very realistic-looking mobile sites to steal details needed to perform SIM ...

CyberheistNews Vol 10 #8 [Heads-up] The World Health Organization Warns of New Coronavirus Phishing Attacks. Inoculate Your Employees!

Feb 18, 2020 9:55:50 AM By Stu Sjouwerman

The Good Taxi Driver

Feb 18, 2020 8:19:13 AM By Stu Sjouwerman

A taxi driver in Roseville, California saved an elderly passenger from being scammed out of $25,000, CNN reports. Rajbir Singh, the owner of Roseville Cab, recently picked up a ...

[World Premiere] KnowBe4's New Season 2 of Security Awareness Video Series - 'The Inside Man'

Feb 18, 2020 8:14:01 AM By Stu Sjouwerman

We’re excited to announce Season 2 of the award-winning KnowBe4 Original Series - ‘The Inside Man’. This network-quality video training series delivers an entertaining learning experience ...

[Heads-up] The World Health Organization Warns of New Coronavirus Phishing Attacks. Inoculate Your Employees!

Feb 18, 2020 7:09:15 AM By Stu Sjouwerman

The World Health Organization (WHO) is putting out an alert about ongoing Coronavirus-themed phishing attacks that impersonate the WHO and try to steal confidential information and ...

Texas Ranks Second in Number of Ransomware Attacks on Health Care Organizations

Feb 17, 2020 4:46:52 PM By Stu Sjouwerman

According to new data from Comparitech, since 2016 Texas has experienced 14 ransomware attacks impacting a total of 483,000 patients, and costing as much as nearly $20 Million in damages.

New Ransomware Variant Disables MSP Remote Management Processes To Evade Detection

Feb 17, 2020 12:19:53 PM By Stu Sjouwerman

Researchers at HuntressLabs “@Huntress” uploaded a YouTube video and commentary on their Twitter account that demonstrates a new variant of Ragnar Locker /Ragnar Locker Ransomware that ...

This Is a Map of KnowBe4's 30,000+ Customers Worldwide

Feb 17, 2020 10:54:50 AM By Stu Sjouwerman

Every once in a while it's just fun to use some mapping software and see the geographic picture of where your customers are. We have tens of thousands or organizations using KnowBe4 all ...

Emotet-Based Sextortion Scams Net 10 Times More than Necurs-Based Scams

Feb 17, 2020 8:28:40 AM By Stu Sjouwerman

The Emotet trojan just won’t die and appears to be gaining steam as sextortion scams are netting cybercriminals a massive return in exchange for their devious efforts.

It Only Takes One Phish: Phishing Attack Results in Network Infiltration, IT Incompetence, and $217,000 in Paid Ransom Fees

Feb 17, 2020 8:24:14 AM By Stu Sjouwerman

The recent attack on a Dutch university demonstrates much of what IT organizations shouldn’t do to avoid an attack.

Security Awareness Training Blog

View Topics

Stu Sjouwerman

Books

Recent Posts

Catphish and Honey Traps

A U.S. Natural Gas Operator Shuts Down For 2 Days After A Phishing Attack Infects It With Ransomware

Over 500 Browser Extensions Secretly Stealing Millions of Users Private Data Yanked From Chrome Store

New Convincing Verizon Smishing Scam Makes SIM Swaps A Breeze

CyberheistNews Vol 10 #8 [Heads-up] The World Health Organization Warns of New Coronavirus Phishing Attacks. Inoculate Your Employees!

The Good Taxi Driver

[World Premiere] KnowBe4's New Season 2 of Security Awareness Video Series - 'The Inside Man'

[Heads-up] The World Health Organization Warns of New Coronavirus Phishing Attacks. Inoculate Your Employees!

Texas Ranks Second in Number of Ransomware Attacks on Health Care Organizations

New Ransomware Variant Disables MSP Remote Management Processes To Evade Detection

This Is a Map of KnowBe4's 30,000+ Customers Worldwide

Emotet-Based Sextortion Scams Net 10 Times More than Necurs-Based Scams

It Only Takes One Phish: Phishing Attack Results in Network Infiltration, IT Incompetence, and $217,000 in Paid Ransom Fees

This is the Phone Company: Give us Your D.O.B, Your Firstborn Child...

Cyberattacks in 2019 Cost over $3.5 Billion in Victim Losses with Business Email Compromise Taking in Half

It Only Takes One Phish: Puerto Rico Gets Scammed Out of $2.6 Million

Fake News and Misplaced Trust

Phishing Remains the Most Frequent Attack Vector Used for Initial Access

Organizations Beware! Cyberattacks are Becoming More Prevalent, Hitting More Device OSes, and are Shifting Focus to You

PayPal Phishing for Passports and More

Search Our Blog

Subscribe To Our Blog

Posts By Topic

Get the latest about social engineering

Subscribe to CyberheistNews

Get the latest about social engineering

Subscribe to CyberheistNews