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

Weird New Cerber Ransomware Speaks To Its Victims

There is a new strain of ransomware called Cerber that takes creepiness to the next level. It drops three files on the victim's desktop named "# DECRYPT MY FILES #." These files contain ...

IRS Warns Against A Widespread CEO Fraud Phishing Scam

OK, heads up! This tax season there is a widespread new scam that specifically targets your HR and Accounting professionals. They get an urgent email from "the CEO" who asks them for all ...

CEO Fraud Phishing Attack steals 11,000 W-2s From Health Care Workers

A phishing incident has compromised the personal information of 11,000 Pennsylvania Main Line Health employees. Officials said the incident occurred on Feb. 16 when an employee fell for a ...

Crelan Bank Loses 75.8 Million Dollars In CEO Fraud

The Belgian Crelan Bank was the victim of a 70 million euro (75.8M U.S.) fraud that was launched from another country. They claim (PDF) this CEO Fraud was discovered during an internal ...

CyberheistNews Vol 6 #2 Scam Of The Week: Fantasy Football Site Hacked

For this Scam Of The Week, we decided to go out on a limb and run a "What If" scenario" on an attack that we think is very likely.

Scam Of The Week: Massive LinkedIn Spam Steals Passwords

"I feel like a complete idiot. I just got taken by a LinkedIn spam that may have just stolen my banking password." These words dropped in my inbox, written a while ago by Dan Tynan, ...

[INFOGRAPHIC] The Top 5 Holiday Scams To Warn Your Users About

There are certain holiday scams we tend to see year after year. This infographic is great to share with your users to help them make smarter security decisions!

New Triple Threat Chimera: Ransomware, Extortion And Data Breach

OK, Heads Up! This has not hit U.S. shores yet, but it's just a matter of time. This nasty bit of crimeware is being beta-tested in Germany at the moment, and that is where the reports ...

FBI ALERT: Cybercriminals Spoof Your Domain With CEO Fraud

The FBI recently warned against a new cyber crime wave. It's called "CEO Fraud" where cybercriminals impersonate your CEO using your own spoofed domain name, and order employees to ...

Ransomware Resume Phishing Security Test Gets Monster Open Rate

Now here is a real IT Horror Story. A brand new KnowBe4 customer which had not yet trained their employees decided to test their staff with one of the new templates we had just released.

It's heeere! Criminal Ransomware as a Service

As we predicted in our whitepaper "Your Money or Your Life/Files", there is now shake-and-bake criminal ransomware that aspiring Internet criminals can put together in a few minutes. Meet ...

Adult Friend Finder Hack Is Nightmare Phishing Problem

Guys, we have a real phishing problem with this Adult Friend Finder (AFF) hack. This particular adult site is one of the most heavily-trafficked websites in the U.S. and has 40 million ...

Social Engineering Exploit Fools HR with Infected IT Resumes

Researchers recently detected a clever email-based attack that combines phishing and social engineering techniques in order to trick users into opening a malicious document. In this ...

Scam Of The Week: 911 Phone Threat

Residents in Ohio are being "beta tested" by cybercrime for a scam that will inevitably also hit all other states. Here is your Scam Of The Week heads-up. This particular scam will also ...

PCI Publishes Guidance On Security Awareness Training

The Payment Card Industry Council thinks Security Awareness Training is so important that they just published a 25-page guidance paper that fully explains the why, how and what of ...

CryptoWall 2.0 Ransomware Moves to TOR network

A new version of the world's most widespread ransomware CryptoWall has migrated to the TOR network. It has been upgraded to version 2.0, and continues to encrypt files so that ransom can ...

Reveton Ransomware Adds Powerful Password Stealer

The Avast Blog reports a new "password stealer" feature in the Reveton ransomware. Reveton is the type of "police" lock/screen ransomware which falsely alerts users they've broken some ...

KnowBe4's Email Exposure Check Discovers Data Breach

You are probably aware of the free one-time Email Exposure Check Pro (EEC Pro) we can run for you. We find all the email addresses of your domain that are out there available on the ...

Cryptolocker Ransomware Variant Hits Synology Users: Synolocker

When your products get targeted with custom made ransomware, you know you've got it made. We're talking about NAS (network-attached storage) built by Synology in Taiwan. the malware has ...