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

Phishing Campaign Targets TikTok Influencers

Phishing emails are targeting large TikTok accounts with phony copyright warnings or offers for account verification, according to researchers at Abnormal Security.

Microsoft Exchange Server Flaws Now Exploited for BEC Attacks

Threat actors are using a couple of dangerous, new tactics to exploit the so-called ProxyShell set of vulnerabilities in on-premises Exchange Servers that Microsoft patched earlier this ...

'Fake Ransomware' as a Form of Social Engineering

Attackers are exploiting a vulnerability in a WordPress plugin to deface several hundred websites with phony warnings of ransomware, the Record reports. Researchers at Sucuri found that ...

Social Engineering, Persistence, and a Few Phone Calls is All it Takes to Steal $1 Million

The story of a Swiss investor who was convinced they were purchasing pre-IPO shares of AirBnB is the cautionary tale of how little it really takes to turn someone into a victim.

Ransomware Gangs Now Have Enough Money to Afford Zero-Day Exploits

Normally so expensive that they are only associated with nation-states, zero-day vulnerabilities are now within reach of ransomware gangs that have amassed fortunes to continue attacks.

Malicious Retail Phishing Sites Spike Ahead of Shopping Holidays

Researchers at Check Point have observed a record number of malicious phishing shopping websites that have been set up over the past two months. The researchers assume these sites were ...

Trends in Cybercrime Report Phishing, Non-Payment Scams, and Extortion

Social engineering attacks account for the vast majority of cybercrime in the US, according to researchers at SEON. The security firm found that phishing, non-payment or non-delivery ...

Rosa Smothers is Featured in the Women Know Cyber Documentary

Our very own Rosa Smothers, SVP of Cyber Operations, has been featured in the Women Know Cyber documentary by Cybercrime Magazine.

Phishing Emails Use Small Font Size to Bypass Security Filters

Researchers at Avanan have spotted phishing emails that use a font size of one to fool email security scanners. The emails appear to be password expiration notifications from Microsoft ...