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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Want Your Ransomed Files Back? Just Infect Someone Else!

Dec 8, 2016 5:03:09 PM By Stu Sjouwerman

Larry Abrams just reported: "Yesterday a new in-development ransomware was discovered by MalwareHunterTeam called Popcorn Time that intends to give victim's a very unusual, and criminal, ...

Locky Ransomware Campaign Using Osiris Extension from Egyptian Mythology

Dec 8, 2016 8:08:04 AM By Stu Sjouwerman

The threat actors behind Locky ransomware have moved on from Norse gods such as Zepto, Odin and Thor and into Egyptian mythology with a new campaign that uses the extension .osiris when ...

Phishing from the Middle: Social Engineering Refined

Dec 8, 2016 7:55:05 AM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. Phishing attacks have long been associated with malicious emails that spoof well-known institutions in order to trick users into coughing ...

Phishing Reply Tracking Is Now Available for All KnowBe4 Customers

Dec 6, 2016 10:48:48 AM By Stu Sjouwerman

Two of the big cybersecurity attacks are the CEO Fraud (aka Business Email Compromise) which has caused $3.4 billion in damages as well as the W-2 Scams which social engineer ...

CyberheistNews Vol 6 #49 Welcome To The CyberheistNews 2017 Crystal Ball Issue.

Dec 6, 2016 9:48:03 AM By Stu Sjouwerman

CyberheistNews Vol 6 #49 Welcome To The CyberheistNews 2017 Crystal Ball Issue. In December I spend a few days analyzing our space, and predict the coming year. The Crystal Ball issue is ...

Kaspersky: DDoS Often Smokescreen For Phishing Attack

Dec 4, 2016 9:13:03 AM By Stu Sjouwerman

Distributed denial of service attacks, also known as DDoS, are becoming a major threat. They can bring websites and networks down, and generally make a lot of noise demanding attention. ...

Phishing Attack Hits Saudi Govt Networks With Disk-Wiping Malware

Dec 3, 2016 11:10:07 AM By Stu Sjouwerman

Hackers penetrated six Saudi Arabian government agencies including its General Authority of Civil Aviation, and bricked thousands of computers with the well-known Shamoon disk-wiper ...

Russian Central Bank Loses 2 Billion Rubles in Cyberheist

Dec 2, 2016 6:38:21 PM By Stu Sjouwerman

Reuters reported that hackers stole more than 2 billion rubles ($31 million) from correspondent accounts at the Russian central bank, the bank said on Friday. “We can’t say exactly when, ...

CyberheistNews Vol 6 #48 Scam Of The Week - Fake News: A Content-Based Social Engineering Attack

Nov 28, 2016 9:46:23 AM By Stu Sjouwerman

The Top Five Names In Cybersecurity

Nov 26, 2016 3:19:03 PM By Stu Sjouwerman

Looking for the top names in cybersecurity? Look no further than the Cybersecurity 500 list of the world’s hottest and most innovative cybersecurity companies: ...

Scam Of The Week - Fake News: a Content-based Social Engineering Attack

Nov 25, 2016 1:51:24 PM By Stu Sjouwerman

Facebook, Google, and Twitter have recently been facing scrutiny for promoting fake news stories. Depending on your sources and who you believe, fake news played and is still playing a ...

10 Ways To Avoid Holiday Scams

Nov 23, 2016 3:55:35 PM By Stu Sjouwerman

With the biggest cybercriminal hacking holidays of the year upon us, it's time for a reminder of red flags to pay attention to when shopping either online or in brick-and-mortar stores.

Why Advanced Ransomware Is Cybercrime's Most Profitable Business Model

Nov 23, 2016 8:46:01 AM By Stu Sjouwerman

RSA did a revealing ransomware risk-reward analysis. See that $6 million number over to the right? Why does cybercrime like ransomware so much? Low Risk, High Payoff From the bad guy's ...

Yes, that message is really from Facebook. And, yes, it's really malicious.

Nov 23, 2016 8:33:01 AM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher Just two weeks after we reported that the bad guys had effectively converted LinkedIin into a phishing platform, Facebook once again found ...

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 ...

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