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

Find all of Stu's books on Amazon

KnowBe4 Selected as SC Media 2017 Professional Award Finalist

Nov 22, 2016 8:10:57 AM By Stu Sjouwerman

KnowBe4, the world's most popular platform for new-school security awareness training was named a finalist in the SC Awards 2017 for exemplary professional leadership in cybersecurity. ...

CyberheistNews Vol 6 #47 New Survey: It Takes 33 Hours To Recover From A Ransomware Infection

Nov 21, 2016 10:00:28 AM By Stu Sjouwerman

Ransomware Roundup November 2016

Nov 21, 2016 7:46:40 AM By Stu Sjouwerman

Crysis decryption keys posted The decryption keys of the Crysis ransomware were posted on Pastebin, which allows victims to decrypt their hijacked files without paying. Crysis was ...

New Phishing Category: Controversial/NSFWOffensive Language

Nov 18, 2016 1:09:18 PM By Stu Sjouwerman

We get thousands of real phishing emails in, reported to us by customers using the free KnowBe4 Phish Alert Button. On a daily basis, these reported phishing emails get analyzed by the ...

This social engineering attack starts with a fake customer-service call

Nov 17, 2016 6:00:57 PM By Stu Sjouwerman

Michael Kan at CSO reported on a TrustWave blog post with some troublesome news: "Hotel and restaurant chains, beware. A notorious cybercriminal gang is tricking businesses into ...

KnowBe4’s Phish Alert Button Now Works With G Suite!

Nov 17, 2016 1:14:42 PM By Stu Sjouwerman

Do your users know what to do when they receive a suspicious email? Should they call the help desk, or forward it? Should they forward to IT including all headers? Delete and not report ...

KnowBe4 Ranked Number 50 Fastest Growing Company in North America on Deloitte’s 2016 Technology Fast 500™

Nov 16, 2016 2:08:07 PM By Stu Sjouwerman

Some very good news! Tampa Bay, FL — November 16, 2016 — KnowBe4, provider of the world’s most popular platform for security awareness training and simulated phishing attacks, today ...

CyberheistNews Vol 6 #46 77% Of Ransomware Attacks Bypass Email Filtering

Nov 15, 2016 8:53:36 AM By Stu Sjouwerman

Urgent Phishing Alert: Warn Your Users Against AdultFriendFinder Scams Now

Nov 14, 2016 7:52:02 AM By Stu Sjouwerman

Your end-users may have seen this in the news yesterday, or will read about it today. A massive data breach of the adult dating and entertainment company Friend Finder Network has exposed ...

Healthcare Sees 20 Data Loss Incidents PER DAY Due To Ransomware

Nov 13, 2016 9:49:23 AM By Stu Sjouwerman

In late October, three of the U.K.’s National Health Service (NHS) hospitals’ computer systems were attacked by malware that forced the hospital to cancel scheduled surgeries and divert ...

Scam Of The Week: Watch Out For Fake Apps

Nov 12, 2016 11:05:22 AM By Stu Sjouwerman

The shoe retailer Foot Locker Inc. has three iPhone apps. But that did not stop an entity calling itself Footlocke Sports Co., Ltd. from offering 16 shoe and clothing apps in the App ...

The LinkedIn Phishing Attack: How They Did It

Nov 11, 2016 5:08:46 PM By Stu Sjouwerman

by Eric Howes (Principal Lab Researcher) & Ryann Falke (Sales Development Representative) Last week we documented several interesting credentials phishes delivered through LinkedIn ...

My Antivirus Failed The RanSim Test. How Do I Fix This?

Nov 10, 2016 11:18:52 AM By Stu Sjouwerman

So, you downloaded KnowBe4's Ransomware Simulator test and your antivirus security software failed one or more of the ransomware scenarios. When this happens we almost always get asked: ...

OK, want to laugh your a$$ off? Watch this Apple parody!

Nov 10, 2016 7:43:31 AM By Stu Sjouwerman

It's not all doom and gloom!

New Locky Ransomware Phishing Attack: Credit Card Suspended And Suspicious Money Movements

Nov 10, 2016 7:05:39 AM By Stu Sjouwerman

Graham Cluley was the first to report on a new Locky ransomware phishing attack where the emails claim to be "credit card suspended" and "suspicious money movement" warnings. He said: "In ...

CyberheistNews Vol 6 #45 Yes, That Email Is Really From LinkedIn. And, Yes, It's Really Malicious.

Nov 7, 2016 9:34:25 AM By Stu Sjouwerman

Tech support scammers abuse bug in HTML5 to freeze computers

Nov 7, 2016 7:17:33 AM By Stu Sjouwerman

Malwarebytes Researcher Jerome Segura reported on a new Tech Support scam that uses a known HTML5 bug to freeze the system and trick people to call a fake support number. Note, it does ...

City Of El Paso Victim Of 3 Million Dollar Phishing Scam

Nov 5, 2016 3:36:25 PM By Stu Sjouwerman

During a news conference Wednesday afternoon, city officials revealed that cybercriminals pretending to be a vendor scammed the city's Accounts Receivable Department out of about $3 ...

New Version Of Nymaim Malware Targets High-Level Managers

Nov 5, 2016 10:23:22 AM By Stu Sjouwerman

A new version of the Nymaim malware family targets high-level managers with attached malicious Word documents and drops ransomware and banking trojans. The cyber research team at Verint ...

Yes, that email is really from LinkedIn. And, yes, it's really malicious.

Nov 4, 2016 7:29:23 AM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. Several months ago we blogged about a startling discovery by threat researchers at Proofpoint: the bad guys had figured out a way to turn ...

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