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

Who Were The Two Big US Tech Companies That Lost $100 Million In CEO Fraud?

Mar 23, 2017 6:51:21 AM By Stu Sjouwerman

4/28/2017 UPDATE: Facebook and Google confirmed as victims of $100M phishing scam. Story at The Verge. In an update on an earlier post of April 2016, more detail came known about this ...

CyberheistNews Vol 7 #12 A Single Spear Phishing Click Caused the Yahoo Data Breach

Mar 21, 2017 9:45:32 AM By Stu Sjouwerman

CyberheistNews | KnowBe4

Mandiant M-Trends 2017: "Cybercrime Skills Now On Par With Nation States"

Mar 18, 2017 4:28:00 PM By Stu Sjouwerman

There was some good news reported in Mandiant's M-Trends 2017 report, but this was heavily outweighed by a lot of very bad news. Mandiant, which is a Fireye company, found that in 2016 ...

A Single Spear Phishing Click Caused The Yahoo Data Breach

Mar 18, 2017 10:51:01 AM By Stu Sjouwerman

A single click was all it took to launch one of the biggest data breaches ever. One mistaken click. That's all it took for a Canadian hacker aligned with rogue Russian FSB spies to gain ...

Scam Of The Week: New FBI and IRS Alerts Against W-2 Phishing

Mar 18, 2017 8:11:27 AM By Stu Sjouwerman

There is a wave of W-2 phishing attacks going on. We see these coming in through thousands of reported scam attempts via our Phishing Alert Button. The FBI and the IRS have repeatedly ...

Petya MFT Ransomware Returns, Wrapped In Extra Nastiness

Mar 16, 2017 7:33:35 AM By Stu Sjouwerman

Kasperky researchers discovered a new variant of last year's Petya Master File Table (MFT) ransomware, with "new and improved" crypto and ransomware models. Remember, MFT ransomware only ...

CyberheistNews Vol 7 #11 [ALERT] New Ransomware Phishing Scheme Lets Wannabe Cybercrims In For Nothing...

Mar 14, 2017 9:43:15 AM By Stu Sjouwerman

CyberheistNews | KnowBe4

Verizon Wanted A 925 Million Discount Because Of Yahoo Hacking. CEO Mayer gets 23 Million Parachute

Mar 14, 2017 7:47:12 AM By Stu Sjouwerman

A newly filed Schedule A proxy statement at the Securities and Exchange Commission shows that Verizon requested a discount of 925 million dollar off the original 4.83 billion purchase ...

SEC Phishing Emails Target Execs For Inside Info

Mar 11, 2017 3:07:06 PM By Stu Sjouwerman

A sophisticated phishing attack is trying to get confidential corporate information. Bad guys are sending spoofed emails claiming to be from the Security and Exchange Commission, and ...

Heads-Up. New Ransomware phishing scheme lets wannabe cybercrims get in for free...

Mar 9, 2017 5:21:18 PM By Stu Sjouwerman

Danny Palmer at ZDNet reported on a new scheme for aspiring cyber criminals that lets them into the ransomware racket for free, but at a steep 50/50 split with the people that provide ...

Scary new malware hides in memory, uses DNS to communicate, and spreads through phishing

Mar 6, 2017 1:26:26 PM By Stu Sjouwerman

Cisco has a separate threat research group called Talos. They just published a report on a scary new form of malware that’s hard to detect. They called it DNSMessenger, and the malicous ...

Verizon: "Most Breaches Trace to Phishing, Social Engineering"

Mar 6, 2017 9:57:55 AM By Stu Sjouwerman

BankInfoSecurity wrote: "Ninety percent of data breaches seen by Verizon's data breach investigation team have a phishing or social engineering component to them. Not coincidentally, one ...

CyberheistNews Vol 7 #10 [ALERT] New Massive Wave of CryptoLocker Ransomware Infections

Mar 6, 2017 9:54:49 AM By Stu Sjouwerman

CyberheistNews | KnowBe4

Scam Of The Week: Mystery Shopper Email

Mar 5, 2017 11:55:50 AM By Stu Sjouwerman

Steven Weisman, Esq. warned against this scam and wrote March 5th: "Mystery shoppers are people hired to shop at a particular store and report on the shopping experience for purposes of ...

[ALERT] New Massive Wave Of CryptoLocker Ransomware Infections

Mar 5, 2017 10:56:09 AM By Stu Sjouwerman

We all thought that evil genius Evgeniy Bogachev had retired at the Black Sea with his tens of millions of ill-gotten gains after he became the FBI's #1 Most Wanted cybercriminal. Well, ...

KnowBe4 Moves From #139 to #38 On Cybersecurity 500

Mar 2, 2017 8:00:16 AM By Stu Sjouwerman

The Cybersecurity 500 / Q1 2017 list of the world's hottest security companies was officially released yesterday, Mar. 1. In their "Movers and Shakers" section they stated: "KnowBe4 is a ...

Ransomware for Dummies: Anyone Can Do It

Mar 2, 2017 7:41:00 AM By Stu Sjouwerman

Brian Krebs just wrote: "A big reason for the steep increase in ransomware attacks in recent years comes from the proliferation of point-and-click tools sold in the cybercrime underground ...

VISA warns for Flokibot Spear Phishing Infections

Mar 1, 2017 2:31:10 PM By Stu Sjouwerman

VISA warned all its merchants that multiple infosec firms reported on the emerging threat of a new malware variant identified as “Flokibot.”

Report: 85% of Ransomware Victims Get Taken Offline For A Week or More [INFOGRAPHIC]

Feb 28, 2017 11:25:28 AM By Stu Sjouwerman

New research reveals that the majority of ransomware victims (85 percent) had their systems taken offline for at least a week, costing businesses thousands in financial damage each day.

2016 Exceeds All Records in Numbers of Phishing Attacks

Feb 28, 2017 10:14:06 AM By Stu Sjouwerman

Year over year sustained growth in phishing campaigns produces yet another record number of attacks The Anti-Phishing Working Group (APWG) observed that 2016 ended as the worst year for ...

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Stu Sjouwerman

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Recent Posts

Who Were The Two Big US Tech Companies That Lost $100 Million In CEO Fraud?

CyberheistNews Vol 7 #12 A Single Spear Phishing Click Caused the Yahoo Data Breach

Mandiant M-Trends 2017: "Cybercrime Skills Now On Par With Nation States"

A Single Spear Phishing Click Caused The Yahoo Data Breach

Scam Of The Week: New FBI and IRS Alerts Against W-2 Phishing

Petya MFT Ransomware Returns, Wrapped In Extra Nastiness

CyberheistNews Vol 7 #11 [ALERT] New Ransomware Phishing Scheme Lets Wannabe Cybercrims In For Nothing...

Verizon Wanted A 925 Million Discount Because Of Yahoo Hacking. CEO Mayer gets 23 Million Parachute

SEC Phishing Emails Target Execs For Inside Info

Heads-Up. New Ransomware phishing scheme lets wannabe cybercrims get in for free...

Scary new malware hides in memory, uses DNS to communicate, and spreads through phishing

Verizon: "Most Breaches Trace to Phishing, Social Engineering"

CyberheistNews Vol 7 #10 [ALERT] New Massive Wave of CryptoLocker Ransomware Infections

Scam Of The Week: Mystery Shopper Email

[ALERT] New Massive Wave Of CryptoLocker Ransomware Infections

KnowBe4 Moves From #139 to #38 On Cybersecurity 500

Ransomware for Dummies: Anyone Can Do It

VISA warns for Flokibot Spear Phishing Infections

Report: 85% of Ransomware Victims Get Taken Offline For A Week or More [INFOGRAPHIC]

2016 Exceeds All Records in Numbers of Phishing Attacks

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