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Oct 18, 2021
Grief Ransomware Gang Claims 41 New Victims, Targeting Manufacturers; Municipalities; & Service Companies in U.K. & Europe
Grief Operators Earned an Estimated 8.5 Million British Pounds in Four Months Key Findings: The Grief Ransomware Gang (a rebrand of the DoppelPaymer Ransomware Group) claims to have infected 41 new victims between May 27, 2021—Oct. 1, 2021 with their ransomware.Over half the companies listed on Grief’s underground leak site are based in the U.K. and Europe. The Grief Ransomware Gang appears to…
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About Us
eSentire is The Authority in Managed Detection and Response Services, protecting the critical data and applications of 1000+ organizations in 70+ 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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Oct 12, 2021
eSentire Launches MDR with Microsoft Azure Sentinel Extending Response Capabilities Across Entire Microsoft Security Ecosystem
Waterloo, ON – Oct. 12, 2021 -- eSentire, recognized globally as the Authority in Managed Detection and Response (MDR), today announced the expansion of its award-winning MDR services with Microsoft Azure Sentinel, as part of its integration with the complete Microsoft 365 Defender and Azure Defender product suites supporting Microsoft SIEM, endpoint, identity, email and cloud security services.…
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Blog — Sep 22, 2020

Teaming up with VMware Carbon Black to Hunt Evasive Malware

Beyond the first-order health effects of the COVID-19 and the second-order impact on the social and economic environment, the global pandemic has forced upon companies and other organizations a degree of technical and operational change—in terms of the combined might of scope and suddenness—that is without equal.

Workforce shifts to home workstations and the rapid migration to (or accelerated introduction of) more cloud services in support of that shift have altered threat surfaces. In parallel, this shift has disrupted processes and changed the working environments for many.

We recently teamed up with our partner VMware Carbon Black to investigate the impact that these changes have had on how threat actors operate. You can find the full results of this investigation in Threat Intelligence Spotlight: Hunting Evasive Malware, but in this post we’ll focus on one clear observation.

Perimeter dissolution leads to an emphasis on exploiting user behavior and leveraging trusted tools.

Threat actors, showing their usual agility, have shifted efforts to target remote workers and take advantage of current events. Because today’s networks have more sophisticated automated defenses than ever before, attackers are turning to:

When used in combination, as is frequently the case, these techniques are effective at bypassing automated defenses to gain initial access. In fact, the majority of successful bypass incidents eSentire observes result from these tactics. In the first half of 2020, eSentire observed Zloader, Valak, SocGholish and More_eggs successfully employing user exploitation and LOLBin abuse to gain initial access (the report examines a few examples in some detail).

Hunting is a necessity.

Customizable behavioral rules, macro controls and macro signing provide some defenses. However, the challenge in developing automated defenses against user execution and LOLBins is that these activities in isolation do not indicate intent. It is only when considering the larger context of the action or execution that the malicious intention becomes clear.

That is why threat hunting is so important. Through continuous and collaborative research, threat hunters can distinguish between legitimate and malicious use of tools and processes, which is a necessary precursor to defining automated methods that reliably detect endpoint threats.

Mark Sangster
Mark Sangster Vice President and Industry Security Strategist

Mark is a cybersecurity evangelist who has spent significant time researching and speaking to peripheral factors influencing the way that legal firms integrate cybersecurity into their day-to-day operations.