Cyber risk and advisory programs that identify security gaps and build strategies to address them.
MDR that provides improved detection, 24/7 threat hunting, end-to-end coverage and most of all, complete Response.
Our team delivers the fastest response time in the industry. Threat suppression within just 4 hours of being engaged.
Be protected by the best from Day 1.
24/7 Threat Investigation and Response.
Expert hunting, research and content.
Defend brute force attacks, active intrusions and unauthorized scans.
Safeguard endpoints 24/7 by isolating and remediating threats to prevent lateral spread.
Investigation and enhanced threat detection across multi-cloud or hybrid environments.
Configuration escalations, policy and posture management.
Detects malicious insider behavior leveraging Machine Learning models.
Customer testimonials and case studies.
Stories on cyberattacks, customers, employees, and more.
Cyber incident, analyst, and thought leadership reports.
Demonstrations, seminars and presentations on cybersecurity topics.
Information and solution briefs for our services.
MITRE ATT&CK Framework, Cybersecurity Assessment, SOC Calculator & more
eSentire will be a Sponsor at the NetDeligence Cyber Risk Summit in Fort…
eSentire will be a Sponsor at the NetDeligence Cyber Risk Summit in…
eSentire is an exhibitor at RSAC 2023. Visit us at Booth 0535.
Malware researcher Brad Duncan recently reported analysis on a new variant of Dridex he observed on June 17th (edit: Additional information reveals it may have been originally discovered by @James_inthe_box on June 13.) The malware utilizes an Application Whitelisting technique to bypass mitigation via disabling or blocking of Windows Script Host. The technique takes advantage of WMI command-line (WMIC) utility's weak execution policy around xls scripts.
On June 26, 2019, eSentire Threat Intelligence discovered new infrastructure pointing to a similar Dridex variant (see IOCs below). At the time of discovery, using data from VirusTotal, only six antivirus solutions of about 60 detected suspicious behavior . About 12 hours later, on the morning of June 27, 16 antivirus solutions could identify the behavior.
Similar to Emotet, Dridex has undergone numerous transformations as it has evolved over the last decade . Dridex first appeared as Cridex in 2011 boasting features such as dynamic configuration, web injections, and infecting connected USB devices. The malware targets banking information on the victim system. Over the last decade, Dridex underwent a series of feature augmentation, including a transition to XML scripts, hashing algorithms, peer-to-peer encryption, and peer-to-command-and-control encryption. Like Emotet, each new version of Dridex traces a further step in the global arms race as the security community responds with new detection and mitigations.
Trend Micro concluded last year that similarities between Emotet, Ursnif, and Dridex indicate some established social structure might exist between the associated threat actors, but the nature of that social structure is not known . Once black markets reach sufficient size and complexity, analogs of partnerships, insider trading, employee transfer of knowledge, and IP theft are likely to take place between malware groups.
Expect More Infrastructure and other Indicator changes
Two observations indicate this campaign isn’t done shifting identifiers. Given the same-day deployment and implementation of the ssl-pert[.]com domain on June 26thand a tendency to utilize randomly generated variables and URL directories, it is probable the actors behind this variant of Dridex will continue to change up indicators throughout the current campaign.
[image src="/assets/DridexMessage2.png" id="2271" width="400" height="309" class="center ss-htmleditorfield-file image" title="DridexMessage2"]
Further, Duncan  also reported polymorphism in the supporting library: “the Dridex DLL files are 64-bit DLLs using file names that are loaded by legitimate Microsoft Windows system EXEs. These file paths, file names, and associated SHA256 hashes change every time the victim logs onto the infected Windows host.”
The malware was observed arriving through email in the form of a malicious document with embedded macros. Depending on the environment, the macros can be triggered by varying levels of employee interaction. The message in the email appears as below with specific numbers redacted (as they could potentially be used by a threat actor to track campaign victim metrics).
[image src="/assets/DridexMessage.png" id="2270" width="500" height="187" class="center ss-htmleditorfield-file image" title="DridexMessage"]
Given email as the initial access point, employees are the first line of defense against this threat. Expect financial departments to be targeted by unsolicited invoices carrying malicious macros within. Some antivirus engines were able to detect (but not specify) the suspicious behavior. Given the rapid turnover of infrastructure and indicators, signature-based antivirus solutions will continue to have gaps throughout the Dridex campaign.
Abuse of MWIC was observed by Symantec in August of 2018 . In that case, however, wmic was used to download the XSL file which was then executed by mshta.
Indicators of Compromise (IOCs):
eSentire is the Authority in Managed Detection and Response, protecting the critical data and applications of 1500+ 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. Combining cutting-edge machine learning XDR technology, 24/7 Threat Hunting, and proven security operations leadership, eSentire mitigates business risk, and enables security at scale. The Team eSentire difference means enterprises are protected by the best in the business with a named Cyber Risk Advisor, 24/7 access to SOC Cyber Analysts & Elite Threat Hunters, and industry-leading threat intelligence research from eSentire’s Threat Response Unit (TRU). eSentire provides Managed Risk, Managed Detection and Response and Incident Response services. For more information, visit www.esentire.com and follow @eSentire.