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

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 ...

CyberheistNews Vol 6 #45 [ALERT] 14 Million Locky Ransomware Phishing Attacks Sent In One Day

Nov 1, 2016 10:04:11 AM By Stu Sjouwerman

Boy have we grown... KnowBe4 Halloween 2014, 2015, 2016

Oct 31, 2016 4:42:21 PM By Stu Sjouwerman

Halloween 2014 15 employees. Scroll down for the later years!

Scam Of The Week: Tech Support Claims Your Hard Disk Will Be Deleted

Oct 29, 2016 11:52:42 AM By Stu Sjouwerman

Symantec warns that tech support scams are getting more sophisticated by the month: "These scams remain one of the major and evolving forces in the computer security landscape. Between ...

How Podesta got hacked: HelpDesk said 'Password' phishing email was real

Oct 29, 2016 10:09:40 AM By Stu Sjouwerman

John Podesta, Chairman of the 2016 Hillary Clinton presidential campaign was a victim of social engineering and rushed advice from his IT helpdesk. It's a comedy of errors. The helpdesk ...

82% of Email Servers are Misconfigured, Allowing Domain Spoofing

Oct 28, 2016 1:48:53 PM By Stu Sjouwerman

We reviewed thousands of domains that have been through our domain spoof test and analyzed more than 10,000 email servers. We found that 82% of these are misconfigured.

Insurance underwriter Beazley: "Ransomware attacks will be four times higher in 2016"

Oct 27, 2016 6:07:45 PM By Stu Sjouwerman

The Wall Street Journal is getting the message. They said : "For companies concerned about the soaring number of ransomware attacks–in which hackers take control of data or systems and ...

Who Is Learning How to Take Down the Internet?

Oct 24, 2016 10:00:00 AM By Stu Sjouwerman

It was all over the news. A sustained DDoS attack that caused outages for a large number of Web sites Friday was launched with the help of hacked “Internet of Things” (IoT) devices. Jeff ...

CyberheistNews Vol 6 #43 Who Is Learning How To Take Down The Internet?

Oct 24, 2016 9:50:26 AM By Stu Sjouwerman

Researchers discover new malicious IoT worm

Oct 24, 2016 7:54:54 AM By Stu Sjouwerman

Researchers at RapidityNetworks discovered a new malicious worm using Telnet that infects IoT devices using their insecure default credentials and uses a peer-to-peer network to install ...

Ransomware Strain Count Surpasses 200

Oct 22, 2016 6:47:53 PM By Stu Sjouwerman

Michael Gillespie tweeted: "Whew! ID #Ransomware can now identify 200 ransomware families. :) Sad such a milestone was hit so quickly..." He added a list from the malwarehunterteam site, ...

The New Posterboy of CyberInsecurity: John Podesta Fell For Social Engineering Attack

Oct 22, 2016 10:26:56 AM By Stu Sjouwerman

Motherboard has a great article explaining just how Podesta, Chairman of the 2016 Hillary Clinton presidential campaign got hacked. (Podesta previously served as Chief of Staff to ...

A Slick Phish with a Hidden Surprise

Oct 20, 2016 4:44:22 PM By Stu Sjouwerman

By Eric Howes, KnowBe4 Principal Lab Researcher. Yesterday one of our customers was hit with a highly targeted phishing attack -- one of the slicker attacks we've seen in a while. Once we ...

"My AV blocked RanSim.exe So I'm Safe" No You Are Not

Oct 20, 2016 10:32:11 AM By Stu Sjouwerman

I'm noticing a lot of people saying the ransim.exe file is getting blocked by your AV. You have to actually allow the initial processes to run to do the simulation. It is the five test ...

CyberheistNews Vol 6 #42 How Vulnerable Is Your Network? Download The New Ransomware Simulator.

Oct 18, 2016 9:29:11 AM By Stu Sjouwerman

Python Ransomware Uses A Unique Key For Each File That Is Encrypted

Oct 15, 2016 10:33:23 AM By Stu Sjouwerman

A new ransomware strain written in Python called CryPy was disclosed by Avast malware analyst Jakub Kroustek. It seems that Pyton is getting more popular as a ransomware development ...

Yahoo Hack Triggers 'Material Adverse Change' Clause

Oct 14, 2016 7:52:34 AM By Stu Sjouwerman

The Wall Street Journal reported that Verizon's lawyers are looking at using the "material adverse clause' to renegotiate the terms of the $4.8 billion deal they struck on July. Verizon’s ...

More than 60% of US office workers are unaware of the ransomware threat

Oct 13, 2016 8:26:51 AM By Stu Sjouwerman

Nearly half of ransomware attacks are aimed at office workers, but almost two-thirds of those polled are unaware of the threat More than 60% of US office workers are unaware of ransomware ...

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