Combine cutting-edge XDR technology, multi-signal threat intelligence and 24/7 Elite Threat Hunters to help you build a world-class security operation.
Our team delivers the fastest response time in the industry. Threat suppression within just 4 hours of being engaged.
Cyber risk and advisory programs that identify security gaps and build security strategies to address them.
XDR with machine learning that eliminates noise, enables real-time detection and response, and automatically blocks threats.
24/7 SOC-as-a-Service with unlimited threat hunting and incident handling.
Proactive threat intelligence, original threat research and a world-class team of seasoned industry veterans.
Extend your team capabilities and prevent business disruption with expertise from eSentire.
Stop ransomware before it spreads.
Meet regulatory compliance mandates.
Detect and respond to zero-day exploits.
End misconfigurations and policy violations.
Defend third-party and supply chain risk.
Prevent disruption by outsourcing MDR.
Adopt a risk-based security approach.
Meet insurability requirements with MDR.
Protect your most sensitive data.
Defend brute force attacks, active intrusions and unauthorized scans.
Guard endpoints by isolating and remediating threats to prevent lateral spread.
Investigation and threat detection across multi-cloud or hybrid environments.
Remediate misconfigurations, vulnerabilities and policy violations.
Defend brute force attacks, active intrusions and unauthorized scans.
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…
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.
We believe a multi-signal approach is paramount to protecting your complete attack surface. See why eSentire MDR means multi-signal telemetry and complete response.
See how our 24/7 SOC Cyber Analysts and Elite Threat Hunters stop even the most advanced cyberattacks before they disrupt your business.
Choose the right mix of Managed Detection and Response, Exposure Management, and Incident Response services to strengthen your cyber resilience.
Try our interactive tools including the MITRE ATT&CK Tool, the SOC Pricing Calculator, the Cybersecurity Maturity Assessment, and our MDR ROI Calculator.
Read the latest security advisories, blogs, reports, industry publications and webinars published by eSentire's Threat Response Unit (TRU).
See why 2000+ organizations count on eSentire to build resilience and prevent business disruption.
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…
In early December 2023, the eSentire Threat Response Unit (TRU) detected an attempted, and ultimately unsuccessful, Ducktail malware infection, targeting an employee in digital marketing at a customer within the business services industry. The Ducktail distributors contacted the employee via LinkedIn with a private message containing an attachment leading to a ZIP archive.
The ZIP archive contains bloated shortcuts that are over 800MB in size. The shortcuts contain the batch scripts that execute PowerShell commands.
An example of one of the shortcut files is shown in Figure 2.
Upon decoding the script, we get base64-encoded strings that decodes to the script shown in Figure 3.
The script downloads the file from hxxps://gdfsgfdrgetgergdsf[.]tech/file/ps/5f8f8c05db68cca200c6379b825648b5.jpg (MD5: 5f8f8c05db68cca200c6379b825648b5).
The downloaded file is another PowerShell script (Figure 4) that downloads the decoy PDF file from hxxp://gdfsgfdrgetgergdsf[.]tech/file/docs/ (Figure 5).
Next, the script (Figure 6) does the following:
As you can see in Figure 6, some of the commands are assigned to variables that are base64-encoded.
The payload retrieved contains another PowerShell script (Figure 7) that does the following:
The retrieved file 5be7408b84fbd40c8e7930f4c28a585a.jpg (MD5: 5be7408b84fbd40c8e7930f4c28a585a ) contains the obfuscated PowerShell command to retrieve the d4e1a9191216420ce7989cf6c3e203cd.jpg file as shown in Figure 8. The command is being decrypted via the hardcoded XOR key, but the threat actors made sure to make it hard to find it via numerous bitwise operations and conditional jump instructions (Figure 8).
The payload mainbot.exe retrieved from C2 is responsible for establishing the connection with the C2 server and taking remote commands. Upon successful bot registration, the infected host obtains myRdpService.exe (MD5: 1ade74bbf88c1a41a352682a8f2265f9) from C2 and RDP Wrapper configuration (hxxp://138.201.8[.]186:8000/file/rdpwrap.txt).
The commands upon checking in from mainbot.exe:
begin connect begin sending DEVICEINFO|quyet!D5A7F263FE404D449438C649AA1E54EE|79b707124b0b4a92b2949acb220b1235|Admin|1.7.2
Further commands from the bot:
STATUS|23/12/2023 10:26:56|Set permission of C:\Users\Default\AppData STATUS|23/12/2023 10:27:12|add exclude result STATUS|23/12/2023 10:26:56|Success STATUS|23/12/2023 10:26:56|Set permission of C:\Users\Default User\AppData STATUS|23/12/2023 10:26:56|Success STATUS|23/12/2023 10:26:56|Set permission of C:\Users\username\AppData STATUS|23/12/2023 10:26:56|role admin name Administrators STATUS|23/12/2023 10:26:56|Set permission of C:\Windows\Temp STATUS|23/12/2023 10:26:56|RDP|False STATUS|23/12/2023 10:26:56|Success STATUS|23/12/2023 10:26:56|Set permission of C:\Users\Default\AppData STATUS|23/12/2023 10:26:56|role admin name Administrators STATUS|23/12/2023 10:26:56|Success STATUS|23/12/2023 10:27:29|status term service STATUS|23/12/2023 10:27:05|Success STATUS|23/12/2023 10:27:08|create user result STATUS|23/12/2023 10:27:12|term service install state True STATUS|23/12/2023 10:27:20|delete old rdpwrap ok STATUS|23/12/2023 10:27:20|delete file rdpwrap.ini ok STATUS|23/12/2023 10:27:22|try download from hxxp://138.201.8[.]186:8000/file/rdpwrap.txt OK STATUS|23/12/2023 10:27:22|start TermService againt STATUS|23/12/2023 10:27:20|try download from hxxp://138.201.8[.]186:8000/file/rdpwrap.txt STATUS|23/12/2023 10:27:20|delete old rdpwrap ok STATUS|23/12/2023 10:27:20|delete file rdpwrap.ini ok STATUS|23/12/2023 10:27:20|try download from hxxp://138.201.8[.]186:8000/file/rdpwrap.txt STATUS|23/12/2023 10:27:22|try download from hxxp://138.201.8[.]186:8000/file/rdpwrap.txt OK STATUS|23/12/2023 10:27:22|start TermService againt STATUS|23/12/2023 10:27:29|status term service STATUS|23/12/2023 10:27:34|check file hash 1ade74bbf88c1a41a352682a8f2265f9 of file <a href="http://138.201.8">http://138.201.8</a>[.]186:8001/file/t/RdpService[.]exe STATUS|23/12/2023 10:27:34|download my rdp service new success, setup STATUS|23/12/2023 10:27:37|result install myRdpService STATUS|23/12/2023 10:27:44|hide user STATUS|23/12/2023 10:27:44|hide user success
As you can observe from the hints above, mainbot.exe checks the hash of the retrieved RdpService[.]exe file, attempts to create the user “User1” on infected machine, performs the exclusion of “C:\Program Files” folder for Windows Defender and changes the access control list for specific folders. Periodically it also sends “TESTDATA”.
myRdpService.exe establishes the remote connection with hxxp://23.88.71[.]29:8000 sending the following command containing Device ID and the presumably threat actor’s name that is used as an argument to run mainbot.exe and myRdpService.exe payloads (DEVICEID_quyet_5C0B1DC44D4E637D1A6B43502D6F6167_1.6.5).
Two files are dropped in the working directory after successful exection of myRdpService.exe: deviceId.txt (contains device ID) and log_rdp_<ddmmyyyy_yy>.txt (contains log messages) (Figure 9).
The service “myRdpService” is created to start myRdpService.exe with an argument “quyet” under the working directory.
Two core payloads, named 'mainbot.exe' and 'myRdpService.exe,' are .NET payloads compiled using native Ahead-Of-Time (AOT) compilation to make the analysis process more complicated.
The rest of the shortcuts perform similar actions described above but the hashes for files for some shortcuts are different.
Our team of 24/7 SOC Cyber Analysts isolated the affected host, contained the threat, and notified the customer of suspicious activities.
You can access the IOCs for Ducktail here.
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.