Stu Sjouwerman

Chief Executive Officer & President

Stu Sjouwerman (pronounced “shower-man”) is the founder and CEO 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.

Books

Cyberheist E-Book

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KnowBe4's Field Guide to Macro Warning Screens

Aug 26, 2016 5:29:11 PM By Stu Sjouwerman

Earlier this week today we assisted several companies that were hit by ransomware. Although companies and organizations hit by ransomware can usually pinpoint the source or employee ...

Ransomware & Voicemail Notifications, Redux

Aug 26, 2016 1:18:45 PM By Stu Sjouwerman

Several days ago we posted about a new ransomware campaign pushing Cerber through malicious ZIP files attached to voicemail-themed phishing emails. Fast on the heels of that campaign ...

Here is a Real DDoS Plus Ransomware Extortion Attack

Aug 26, 2016 11:05:24 AM By Stu Sjouwerman

One of our customers received the following email today. It's a clear extortion attempt, they are threatening to execute a combined DDoS and Cerber ransomware attack. These bad guys claim ...

Heads-up! Voice message notification email warning could be ransomware

Aug 24, 2016 2:13:01 PM By Stu Sjouwerman

Don't play voicemail messages from suspicious sources. Example displayed in MS Outlook. Image credit: SANS ISC.

How Highly Personalized Ransomware Attacks Are Getting

Aug 23, 2016 11:40:48 AM By Stu Sjouwerman

CyberheistNews Subscriber Stuart Sanders sent me this: "A friend of mine in Melbourne Australia has been whacked by several crypto attacks on his clients in the last week. He supports ...

CyberheistNews Vol 6 #34 [ALERT] Cerber Ransomware Plague Earns 2 Mil With Just 0.3% Victims Paying Up

Aug 22, 2016 9:44:09 AM By Stu Sjouwerman

Cerber Ransomware Plague Earns 2 Mil With Just 0.3% Victims Paying Up

Aug 21, 2016 8:38:48 AM By Stu Sjouwerman

A new report by Check Point software's researchers showed that Cerber's Ransomware-as-a-Service (RaaS) affiliate program is a success with more than 160 participants at current count, and ...

Clinton Foundation Gets Spear-Phished By Russians, Hires FireEye To Investigate

Aug 18, 2016 7:38:18 AM By Stu Sjouwerman

REUTERS just reported that the Clinton charitable foundation hired the security firm FireEye to examine its network after seeing indications they might have been hacked by Russians, ...

FireEye warns 'massive' Locky ransomware campaign hits America

Aug 18, 2016 6:43:52 AM By Stu Sjouwerman

The dangerous Locky ransomware is being hurled at a variety of industries, healthcare being the number one target, according to FireEye researcher Ronghwa Chong. We have talked about ...

New Feature: 2-Factor Authentication

Aug 17, 2016 4:36:29 PM By Stu Sjouwerman

All user accounts may now be enabled to require MFA (multi-factor authentication) [also called 2FA, 2 Factor Authentication]. Once configured and enabled for an account the system will ...

KnowBe4 Debuts at #139 on Inc 500 List of America’s Fastest Growing Private Companies

Aug 17, 2016 8:42:58 AM By Stu Sjouwerman

I have some exciting news: KnowBe4 made it in the Inc 500! To start off with, a very big thank you to all our customers who understood the need to manage the ongoing problem of social ...

I was interviewed by DARKReading at BlackHat [VIDEO]

Aug 15, 2016 5:01:52 PM By Stu Sjouwerman

While at BlackHat, the editorial team from DARKReading wanted to know more about what we were doing at KnowBe4. This was a fun, relaxed 15 minutes where we chatted about problems like ...

The Ultimate Pop-up Phishing Warning Message

Aug 15, 2016 4:54:20 PM By Stu Sjouwerman

'Just weeks after she started preparing opposition research files on Donald Trump’s campaign chairman Paul Manafort last spring, Democratic National Committee consultant Alexandra Chalupa ...

CyberheistNews Vol 6 #33 Ransomware Roundup: Fresh Strains And New Nasty Features

Aug 15, 2016 9:43:01 AM By Stu Sjouwerman

PokemonGo Ransomware installs Backdoor Account and Spreads to other Drives

Aug 14, 2016 10:43:11 AM By Stu Sjouwerman

With the popularity of PokemonGo, it was inevitable that a malware developer would create a ransomware that impersonates it. This is the case with a new Hidden-Tear ransomware discovered ...

Hitler ransomware just deletes files instead of encrypting them

Aug 14, 2016 10:19:30 AM By Stu Sjouwerman

Security experts detected and analyzed a new threat, the Hitler ransomware, that doesn’t encrypt files but simply deletes them. Larry Abrams at Bleepingcomputer commented: " It looks like ...

Scam Of The Week: New Social Security Account Fraud

Aug 13, 2016 3:27:36 PM By Stu Sjouwerman

Bad guys are abusing the Social Security Administration's (SSA) online service called My SocialSecurity Account in two ways: A phishing scam which encourages employees to create an ...

July 2016 Ransomware Roundup: New Strains And New Nasty Features

Aug 13, 2016 11:08:17 AM By Stu Sjouwerman

The ransomware market is rapidly maturing, we start seeing upgraded strains and rebranded versions sold cheaply in the Dark Web. And mainstream media have finally glommed on after years ...

When the Bad Guys Go to Ransomware B-School

Aug 12, 2016 1:17:13 PM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. As we have documented numerous times in this space over the past few years, the bad guys have proven to be relentless innovators, ...

CyberheistNews Vol 6 #32 Scary Stuff And Hot Security Products At Black Hat And DEF CON

Aug 8, 2016 9:55:22 AM By Stu Sjouwerman

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