KnowBe4 Blog

Keeping you informed. Keeping you aware.
Stay on top of the latest in human and agent security including social and prompt engineering, ransomware and phishing attacks.

Stu Sjouwerman

Founder and Executive Chairman

Stu Sjouwerman (pronounced “shower-man”) is the Founder and Executive Chairman 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.


Recent Posts

New Phishing Campaign Uses Blackmail to Lure Victims

Bitdefender has observed a phishing campaign that tries to blackmail users into sending money by claiming their computer has been hacked. The emails contain real passwords that have been ...

Visit KnowBe4 at Black Hat USA 2021 - Virtual & In Person Event

Are you attending Black Hat USA 2021 (either in person or virtually) ? Be sure to stop by the KnowBe4 booth August 4th - 5th to find out how to secure your last line of defense: USERS.

Two of the Most Common and Successful Ransomware Attack Methods are Exposed

Researchers at Coveware recently analyzed ransomware attacks during Q2 of this year and noticed a similar trend in ransomware attack methods by cybercriminals.

Ransomware Attacks This Year Are Already Higher Than 2020

According to the 2021 Cyber Threat Report by SonicWall, 304.7 million ransomware attacks occured in the first half of 2021, already surpassing the total number of ransomware attacks for ...

Happy 22nd Annual SysAdmin Day from KnowBe4!

It’s the 22nd annual SysAdmin Day, a day when we celebrate all of the incredible System Administrators! While your job may not be easy (and sometimes not glamorous), your work on the ...

Scammers Use Milanote App to Host Phishing Content and Avoid Detection by Secure Email Gateways

The “Evernote for creatives” collaborative platform is being used to legitimately host malicious links that point victims to phishing links, bypassing detection mechanisms.

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

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

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

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

Cybercriminals Are Growing More Organized

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 ...