What We Do
How we do it
Our Threat Response Unit (TRU) publishes security advisories, blogs, reports, industry publications and webinars based on its original research and the insights driven through proactive threat hunts.
View Threat Intelligence Resources →
Mar 15, 2023
CVE-2023-23397 - Microsoft Outlook Elevation of Privilege Zero-Day Vulnerability
THE THREAT On March 14th, as part of Microsoft’s monthly Patch Tuesday release, the company disclosed a critical, actively exploited vulnerability impacting Microsoft Office and Outlook. The…
Read More
View all Advisories →
About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 2000+ organizations in 80+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events.
Read about how we got here
Leadership Work at eSentire
Mar 20, 2023
Exertis and eSentire Partner to Deliver 24/7 Multi-Signal MDR, Digital Forensics & IR Services and Exposure Management to Organisations Across the UK, Ireland, and Europe
Basingstoke, UK– 20 March, 2023. Leading technology distributor, Exertis, announced today that it has bolstered its cybersecurity services, adding eSentire, the Authority in Managed Detection and Response (MDR), to its Enterprise portfolio of offerings. eSentire’s award-winning, 24/7 multi-signal MDR, Digital Forensics & Incident Response (IR), and Exposure Management services will be available…
Read More
e3 Ecosystem
We provide sophisticated cybersecurity solutions for Managed Security Service Providers (MSSPs), Managed Service Providers (MSPs), and Value-Added Resellers (VARs). Find out why you should partner with eSentire, the Authority in Managed Detection and Response, today.
Learn more
Apply to become an e3 ecosystem partner with eSentire, the Authority in Managed Detection and Response.
Login to the Partner Portal for resources and content for current partners.
News releases — Apr 20, 2022

Renowned Cybersecurity Researcher, Joe Stewart, Joins eSentire’s Elite Security Research Team, the Threat Response Unit (TRU)

3 minutes read

Waterloo, Ontario, April 20, 2022 – eSentire, the Authority in Managed Detection and Response (MDR), today announced that renowned cybersecurity researcher Joe Stewart has joined its world class research team, the Threat Response Unit (TRU). Stewart is joining the team as Principal Security Researcher.

eSentire’s Threat Response Unit, comprised of some of the most accomplished security experts in the business, is at the heart of the company’s security operation, driving continuous threat intelligence and original security research ensuring that eSentire’s customers stay ahead of business disruption. The team exhaustively investigates, and correlates anomalous behavior detected across eSentire’s Atlas XDR Platform to create Machine Learning models that enable the company’s Elite Threat Hunters and SOC Cyber Analysts to proactively hunt the most advanced and undetected cyber threats faster and more effectively. The Threat Response Unit has uncovered nation state attacks and some of the most elusive and dangerous cyberthreats, including the Kaseya VSA compromise, and the more_eggs LinkedIn campaign. They published over 60 original Security Advisories in 2021 and recently launched its public facing monthly Threat Intelligence Briefing to continue educating customers, and the public at large, of emerging threats, and recommended mitigation actions.

Acknowledged as one of the best cybersecurity researchers in the industry, Stewart is known for uncovering some of the top threats that emerged in the past twenty years. Among his many accomplishments, Stewart’s breakthrough investigation of Business Email Compromise schemes was the first major investigation to expose the threat and its damage to businesses worldwide. Stewart also discovered a member of the People’s Liberation Army of China spying on U.S. businesses. Additionally, Stewart developed the Conficker Eye Chart, a simple but ingenious way of determining if one’s computer was infected with the Conficker worm. Prior to joining eSentire, Stewart spent 17 years as Director of Malware Research for Secureworks, a cybersecurity division of Dell, and he most recently served as Principal Threat Researcher at PhishLabs, a cyber threat intelligence company, now part of HelpSystems.

“I've been following eSentire for several years, and have been so impressed by their accomplishments,” said Joe Stewart, Principal Security Researcher, eSentire’s Threat Response Unit. “It's not just about the company’s comprehensive security offerings, but their talented team. eSentire is a mission-driven organization that demonstrates how much it cares about protecting its customers. As someone who has worked in the security industry for over 20 years, I can honestly say that they're one of the best, and I’m proud to become a part of the Threat Response Unit.”

eSentire has established itself as the leading provider of Managed Detection and Response cybersecurity services, protecting the reputations and operations of more than 1200 organizations in over 75 countries from business disruption, with a Mean Time to Contain (MTTC) active cybersecurity threats of less than 15 minutes. eSentire’s AI-driven Atlas XDR Cloud Platform enables real-time detection and response at scale, as each threat detection machine learning model and expert response action are proactively pushed across the eSentire global customer base. This Security Network Effect, coupled with the support of eSentire’s 24/7 Threat Response Unit, Elite Threat Hunters and SOC Cyber Analysts, enables an unrivaled level of protection. In addition to its MDR Services, eSentire provides assessment and planning Managed Risk Services and Digital Forensics and Incident Response services.

To learn more about eSentire’s Threat Response Unit visit eSentire | Threat Response Solutions Outpacing Attacker Strategies.

To learn more about the exciting career opportunities available at eSentire visit eSentire | Grow Your Career in Cybersecurity | eSentire.

About eSentire

eSentire, Inc., is the Authority in Managed Detection and Response, protecting the critical data and applications of 1200+ organizations in 75+ countries from known and unknown cyber threats. Founded in 2001, the company’s mission is to hunt, investigate and stop cyber threats before they become business disrupting events. Combining cutting-edge machine learning XDR technology, 24/7 Threat Hunting, and proven security operations leadership, eSentire mitigates business risk, and enables security at scale. The Team eSentire difference means enterprises are protected by the best in the business with a named Cyber Risk Advisor, 24/7 access to SOC Cyber Analysts & Elite Threat Hunters, and industry-leading threat intelligence research from eSentire’s Threat Response Unit (TRU). eSentire provides Managed Risk, Managed Detection and Response and Incident Response services. For more information, visit www.esentire.com  and follow @eSentire.


Elizabeth W. Clarke
[email protected]