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THE THREAT On February 20th, ConnectWise confirmed that two recently disclosed ScreenConnect vulnerabilities are now under active exploitation. The vulnerabilities are currently tracked as…Feb 09, 2024
THE THREAT On February 7th, CISA, NSA, FBI, along with Five Eyes intelligence partners, published a joint advisory related to state-sponsored threat actors from the People’s Republic of…
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.
Waterloo, ON–February 7, 2024 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced that three of Australia’s top Value-Added Resellers (VARs): Advance Vision Technology, Exigo Tech, and Rubicon 8 have joined eSentire’s CRN 5-Star e3 partner…
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Adversaries don’t work 9-5 and neither do we. At eSentire, our 24/7 SOCs are staffed with Elite Threat Hunters and Cyber Analysts who hunt, investigate, contain and respond to threats within minutes.
We have discovered some of the most dangerous threats and nation state attacks in our space – including the Kaseya MSP breach and the more_eggs malware.
Our Security Operations Centers are supported with Threat Intelligence, Tactical Threat Response and Advanced Threat Analytics driven by our Threat Response Unit – the TRU team.
In TRU Positives, eSentire’s Threat Response Unit (TRU) provides a summary of a recent threat investigation. We outline how we responded to the confirmed threat and what recommendations we have going forward.
Here’s the latest from our TRU Team…
Since November 2023, the eSentire Threat Response Unit (TRU) have observed a significant increase in SolarMarker infections across the clients within the insurance, manufacturing, software, construction, real estate, utilities, and legal industries.
eSentire TRU has tracked SolarMarker since 2021. In recent cases, SolarMarker's threat actor has alternated between Inno Setup and PS2EXE tools to generate payloads. Additionally, payloads generated using PS2EXE were modified using several string replacements on the file, seen in Figures 1 and 2.
The PowerShell script extracted can be seen in Figure 3. This script is designed to write 0 bytes to the decoy PDF named “EULA.pdf,” causing an error when the infected machine tries to open the PDF file. The payload within the script is encrypted using Advanced Encryption Standard (AES). After successfully decrypting the payload, the script will invoke specific class and method names.
SolarMarker’s decrypted payload has changed slightly from the one we described in our previous blog. With the recent payloads, the threat actor added more junk instructions (Figure 4), as can be seen in Figure 5 where junk byte arrays are present.
The string encryption method still remains the same as described in the previous blog.
Upon successful infection, SolarMarker loads second-stage payloads including infostealers and hVNC.
Our team of 24/7 SOC Cyber Analysts isolated the affected host and notified the customer of suspicious activities.
You can access Yara rules for SolarMarker here.
We recommend implementing the following controls to help secure your organization against SolarMarker malware:
eSentire TRU is a world-class team of threat researchers who develop new detections enriched by original threat intelligence and leverage new machine learning models that correlate multi-signal data and automate rapid response to advanced threats.
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Digital Signatures used in the payloads we have seen:
The eSentire Threat Response Unit (TRU) is an industry-leading threat research team committed to helping your organization become more resilient. TRU is an elite team of threat hunters and researchers that supports our 24/7 Security Operations Centers (SOCs), builds threat detection models across the eSentire XDR Cloud Platform, and works as an extension of your security team to continuously improve our Managed Detection and Response service. By providing complete visibility across your attack surface and performing global threat sweeps and proactive hypothesis-driven threat hunts augmented by original threat research, we are laser-focused on defending your organization against known and unknown threats.