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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
Our Threat Response Unit (TRU) publishes security advisories, blogs, reports, industry publications and webinars based on its original research and the insights driven through proactive threat hunts.
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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Read the latest security advisories, blogs, reports, industry publications and webinars published by eSentire's Threat Response Unit (TRU).
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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…
In early September 2023, we received notifications of a phishing campaign targeting the finance industry, with approximately 300 users affected.
The phishing email contained an HTML file. When this file is opened, it communicates with the attacker’s server, which then prompts the user to input their credentials into a fake Microsoft login page.
Depending on the user’s location, the attacker’s server will either display a fake loading page or a deceptive “404 Not Found” error page.
The entered credentials would be posted to an attacker’s C2 server (in our sample, it’s h40pbqrb5ra.lopapscop[.]ws).
Looking at the source code of the HTML file, we noticed that the script is using the CryptoJS library to decrypt the encrypted data using the AES algorithm in CBC mode with PKCS#7 padding, as shown below, where the value “WPfkidgH” would contain the hardcoded email address.
Upon decrypting the code, we see that most of the content is in a hexadecimal format.
Further decoding, we can see the series of strings under the variable var _0xe53b. We can map the strings to specific variables within the deobfuscated code, and we will get a clear understanding of the code’s functionality, as shown below.
Looking at the code, we can see that it implements various anti-analysis / evasion techniques, such as:
For “Displaying the loading screen or “404 Not Found” error anti-analysis / evasion technique, the code gathers the data of the machine via the API request to https://pro.ip-api[.]com/json/?key=pD3jjrEbn4o2CQ1 and then sends the data in a JSON format to the server (for example, enwpcfr7me.lopapscop[.]ws/obufsssssssscaaatoion/ or .wtis4sz9mjF/jdjdmxnx[.]online/obufsssssssscaaatoion/) as shown in Figure 4.
The ‘NAMEOFTHEGUY’ (Figure 4) contains likely the threat actor’s handle for the phishing campaign, in our case it’s “Waaaa.004.aavy”.
Upon the returned data from POST request, the function checks a returned property named "Allow_Online" that is received from the server. Based on its value, it takes different actions:
Additionally, if the current location's hostname is "localhost" or "127.0.0.1", a message "Don't run me here!" is logged to the console.
Upon further investigation of the domains, we discovered more than a thousand associated phishing pages on URLScan.
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.