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

Japan's Largest Port is the Latest Victim of a Ransomware Attack

The largest port in Japan, Nagoya, is now the most recent victim of a ransomware attack.

KnowBe4 Named a Leader in the Summer 2023 G2 Grid Report for Security Awareness Training

We are thrilled to announce that KnowBe4 has been named a leader in the latest G2 Grid Report that compares Security Awareness Training (SAT) vendors based on user reviews, customer ...

The Better Business Bureau Warns of Process-Server Phishbait

The Better Business Bureau (BBB) has warned of a scam in which attackers pose as process servers in order to steal information and commit identity theft.

Your KnowBe4 Fresh Content Updates from June 2023

Check out the 34 new pieces of training content added in June, alongside the always fresh content update highlights, events and new features.

Use of Crypto Mining Pools to Launder Ransom Funds Grows 100,000% Over 5 Years

New analysis shows sources of cryptocurrency being placed into mining pools with huge deposits that make it easier for cybercriminals to make their ransom funds untraceable.

HTML Files Top the List as the Most Commonly Used Malicious Attachment

As executables and scripts are unable to bypass security solutions as attachments, cybercriminals turn to HTML as a means of obfuscation and malicious execution.

Iranian Threat Actor Charming Kitten Using Spear Phishing Campaign To Distribute Malware

The Iranian threat actor Charming Kitten is launching sophisticated spear phishing attacks to distribute a new version of its POWERSTAR malware, according to researchers at Volexity.

The face of 2023's cyber-threat landscape was an alarming surge in ransomware and phishing attacks

When KnowBe4 went public in April 2021, I got to know a select group of analysts that served as co-managers on our IPO. These professionals all know our industry very well and we spoke ...

Newly Discovered Phishing Attacks Target Bank Customers

First National Bank has warned of an increase in phishing and smishing attacks, IT-Online reports.

National Cyber Security Centre Notes UK Law Firms are Main Target for Cybercriminals

In the most recent Cyber Threat report from the National Cyber Security Centre (NCSC), it is clear that UK law firms are a gold mine for cybercriminals.