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THE THREAT eSentire is aware of widespread exploitation attempts targeting the recently disclosed ownCloud vulnerability CVE-2023-49103. CVE-2023-49103 (CVSS: 10) is tracked as a disclosure of… READ NOW
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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 and GITEX GLOBAL 2023, Dubai, UAE – October 18, 2023 – eSentire, Inc., the Authority in Managed Detection and Response (MDR), today announced that Inspira Enterprise Inc, (Inspira), a… READ NOW
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TRU Positives: Weekly investigation summaries and recommendations from eSentire's Threat Response Unit (TRU)
BY eSentire Threat Response Unit (TRU)
January 12, 2023 | 5 MINS READ
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…
It is worth mentioning that the filenames and scheduled task name can be different even if the initial payload was downloaded from the same infected webpage.
The threat actor(s) retrieved and ran the Cobalt Strike payload zieu.ps1 from path appdata\roaming\btbh\.
After establishing the connection with the Cobalt Strike server (91.215.85[.]176), the threat actor(s) proceeded with retrieving and extracting BloodHound, a tool used for graphically analyzing Active Directory and other identity systems to identify attack pathways (20230103151757_bloodhound.zip) that contained pshound.ps1 under C:\Users\<username>.
After further analyzing the Windows Event Logs, we concluded that the script is similar to the one mentioned by GuidePoint Security that appears to be a BloodHound executable.
Besides the Cobalt Strike payload, the threat actor(s) retrieved the following files/tools:
The persistence via Registry Run Keys was created to run the PowerShell SOCKS proxy script with the following values:
Registry Run Key name: socks_powershell
Data (command to run): Powershell.exe -windowstyle hidden -ExecutionPolicy Bypass -File "C:\Users\
The threat actor(s) removed most of the files they dropped on the host including the results produced by BloodHound as well as an unidentified krb.txt file dropped under C:\Users\
After running BloodHound, the threat actor(s) attempted to move laterally by using PsExec to execute file rz.ps1 on a second host. This was not successful due to the PowerShell execution policy preventing execution of untrusted scripts. We were unable to retrieve the rz.ps1 script, but we assess it was likely a Cobalt Strike payload.
|23d3d8cd3a5b8e4703a9b91970d790d1||zieu.ps1 (Cobalt Strike payload)|
|785fcb9380b4c2310c2200790641bc73||s5.ps1 (PowerShell SOCKS proxy)|
|cadb91ac90f52e27c0acae43b79aa202||son.ps1 (PowerShell SOCKS proxy)|
|bbbfab2763b717178141f0561584d087||contract salary calculator ontario 34123.js|
eSentire’s Threat Response Unit (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.
If you are not currently engaged with an MDR provider, eSentire MDR can help you reclaim the advantage and put your business ahead of disruption.
Learn what it means to have an elite team of Threat Hunters and Researchers that works for you. Connect with an eSentire Security Specialist.
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.