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TRU INTELLIGENCE CENTER
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.
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SECURITY ADVISORIES
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…
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ABOUT ESENTIRE
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.
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LATEST PRESS RELEASE
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…
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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.
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Video

eSentire 24/7 SOC Cyber Analysts in Action:

Malicious BestCrypt Detection Uncovers Full Blown Ransomware Attack at 3am

Recently, eSentire’s Security Operations Center (SOC) and Threat Response Unit (TRU) disrupted an active ransomware attack in which threat actors attempted to leverage the BestCrypt and BitLocker tools to deploy ransomware across 250+ workstations and servers.

The adversary used a combination of remote desktop protocol (RDP), Windows Management Instrumentation (WMI), and PsExec to:

  • Enable and configure Windows BitLocker to disable backup and recovery features.
  • Use BitLocker to encrypt attached drives using a randomized password for each host.
  • Copy Jetico’s BestCrypt Volume Encryption Manager software from the staging host and encrypt attached drives on file servers.
  • Drop a ransom note (“readme.txt”).
  • Disable all administrator accounts.

The ransomware attack was first detected by eSentire Managed Detection and Response (MDR) for Endpoint using detection content developed by TRU. Once our SOC Cyber Analysts detected the attack, they conducted a threat investigation, alerted the customer, blocked the BestCrypt executable across all endpoints and isolated the impacted systems.

Watch this video as Spence Hutchinson, Principal Threat Researcher with eSentire’s TRU team, and Brandon Stencell, SOC Incident Handler Lead, review the NahumVoronkov ransomware attack and how our 24/7 SOC Cyber Analysts and TRU responded to the incident on the customer’s behalf.

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