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

Give Me £1,000 to Stop Calling You

Some scammers are taking a more direct approach to asking for money, according to BBC reporter Jane Wakefield. Wakefield received a call from a scammer who claimed to work for Microsoft, ...

[THIS IS UGLY] A Hacker Got All My Texts for $16

VICE just revealed a 2FA hole you can drive a truck through. A gaping flaw in SMS lets hackers take over phone numbers in minutes by simply paying a company to reroute text messages. This ...

FBI Warns Against Deepfakes' Potential for Social Engineering

The FBI has issued an advisory warning of an expected increase in the use of deepfakes for social engineering attacks. Deepfakes are images, videos, audio, or text created via AI to ...

Beware: Lots of COVID-19 Vaccine-Related Attacks Are Active and Looking for Their Next Victim

From spear phishing attacks, to malicious domains, to credential-hunting – as I predicted, COVID vaccines are the hot attack theme right now from just about every angle.

Exchange Exploit Attempts Surge Sixfold as Ransomware Lands

The Phil Muncaster at Info Security Mag had it first: "The number of global exploit attempts targeting vulnerable Microsoft Exchange servers has risen sixfold over the past few days, as ...

The Evolving Cybercriminal Market Has Given Birth to Impersonation-as-a-Service as Attackers Seek to Impersonate at Scale

New research documents Impersonation-as-a-Service (IMPaaS) as an emerging threat where profiles of victim users are available to be used in campaigns where impersonation is critical.

[On-Demand Webinar] Avoiding Business Email Compromise Phishing Scams During Tax Season

Taxes are unavoidable, and unfortunately, so are the annual tax-related phishing scams. This year, with the COVID-19 pandemic continuing to keep people working from home, cybercriminals ...

The Most Commonly Spoofed Business-Related Applications in a Phishing Campaign

Business-related applications like Zoom, Microsoft, and DocuSign are the most commonly spoofed services in phishing attacks, according to a new report from GreatHorn. Business apps made ...

Microsoft Exchange Server hacks ‘doubling’ every two hours | ZDNet

Cyberattackers are taking full advantage of slow patch or mitigation processes on Microsoft Exchange Server with attack rates doubling every few hours. According to Check Point Research ...

[Security Alert Webinar] The Microsoft Exchange Mass Hack Is a Huge Security Risk For All Organizations and What You Can Do About It

On March 2, Microsoft released emergency security updates to plug multiple zero-day security holes in Exchange Server versions 2010 through 2019 that hackers were actively using to siphon ...