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An investigation of a file named ‘Albertsons_payment.GZ’ revealed a sophisticated malware delivery chain.
The file, initially disguised as an image, was actually a Windows Cabinet file containing an obfuscated batch script. This script employed string slicing techniques to reconstruct commands and used LOLbins like extrac32.exe to evade detection.
The payload, identified as Modiloader, a Delphi-based malware, was extracted using certutil.exe. The final stage attempted to fetch additional content from a URL, but failed in the analysis environment.
This attack demonstrates the use of complex obfuscation and living-off-the-land techniques to deliver malware.Modiloader is a significant threat that has been observed delivering payload via an obfuscated batch script. The attackers have used various techniques such as string slicing and LOLbins to evade detection. It is crucial for organizations to be aware of this tactic and take necessary measures to prevent attacks.
Confidence level: 100%
Reliability of the report: A - Completely reliable
Revoke status: false
Number of connected elements present in the report: 24
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Hackers Use Microsoft Management Console to Deliver Malicious Payloads.
As outlined in a recent threat report, hackers have been exploiting the Microsoft Management Console (MMC) to deliver backdoor payloads on Windows systems. This sophisticated campaign employs advanced obfuscation techniques and Microsoft Common Console Document (MSC) files to evade detection.
The attackers, believed to be nation-state actors, use the MMC to drop a stealthy backdoor payload that allows them to maintain persistent access to compromised systems. The malicious activity is said to target organizations in various industries, including government agencies, financial institutions, and technology companies.
The hackers responsible for this campaign have demonstrated expertise in evasive techniques and persistence.
Their tactics include:
The attackers have leveraged various tools and infrastructure, including:
Some notable characteristics of this campaign include:
To mitigate the risks associated with this campaign, organizations can take the following measures:
The tactics employed by this actor group highlight the need for organizations to remain vigilant against emerging threats. It is essential to stay up-to-date with the latest threat reports, maintain robust security controls, and prioritize employee education and awareness.
Resources:
Threat Overview
Cyber threat actors continue to evolve their tactics, techniques, and procedures (TTPs) to evade detection and maximize impact. A recent threat report published by AlienVault on January 13, 2025, highlights a new distribution method for the infostealer malware, LummaC2.
Threat Report: Infostealer LummaC2 Spreading Through Fake CAPTCHA Verification Page
The report details how threat actors are exploiting fake CAPTCHA verification pages to distribute LummaC2 malware. The process begins when users encounter a deceptive authentication screen, often on crack program download pages or in phishing emails. When the user clicks ‘I’m not a robot’, a malicious command is copied to the clipboard.
Malware Execution
This command executes an obfuscated HTA file, which subsequently runs an encrypted PowerShell script. The final payload is LummaC2, capable of stealing browser data and cryptocurrency information from compromised systems.
ClipBanker Module
LummaC2 also employs a ClipBanker module to monitor clipboard content, specifically targeting cryptocurrency wallet addresses for theft.
Threat Actor Group
The report provides a short description of the actor group involved but does not assign a specific attribution. The actor group is presumed to be financially motivated, given the focus on cryptocurrency target theft.
Recommendations
Based on this threat report, several recommendations can be made for enhancing cybersecurity posture:
* Be cautious of interacting with unfamiliar sources when downloading software or opening emails;
* Enable multi-factor authentication whenever possible to protect against stolen credentials;
* Implement robust antivirus and anti-malware solutions;
* Regularly update software packages to address vulnerabilities exploited by threat actors;
* Educate users on the dangers of falling for social engineering traps, such as fake CAPTCHA verification pages.
Threat Report Details
The full threat report can be accessed via the following links:
https://asec.ahnlab.com/en/85699/
**Confidence Level and Reliability**
The confidence level of this threat report is 100, indicating high certainty in the reported observations. The reliability is rated ‘Completely reliable’
Abyss Locker Ransomware Threat Overview
Report Summary:
This report provides a detailed analysis of Abyss Locker, a relatively new threat group that emerged in 2023 and has since caused multiple incidents. Also known as Abyss ransomware, this group specializes in swift and decisive intrusions designed to cripple victims with ransomware.
Threat Actor Group:
The actor group behind Abyss Locker is not clearly identified due to their relatively new emergence. However, they exhibit high levels of sophistication and determination.
Report Reliability: A – Completely reliable
Abyss Locker Attack Analysis:
Initial Access:
Abyss Locker operators primarily gain initial access through exploiting known vulnerabilities in out-of-date software or using stolen credentials obtained from the dark web. They also employ phishing campaigns to trick users into executing malware.
Privilege Escalation & Defense Evasion:
Once inside, the group uses various techniques such as token impersonation and living-off-the-land tools to escalate privileges and evade detection. They often disable security software and modify system files to maintain persistence.
Lateral Movement:
Abyss Locker operators move laterally within the network using legitimate tools like PsExec and remote desktop protocols (RDP). They also employ pass-the-hash techniques to bypass credentials.
*Command & Control:**
The group uses custom-built C&C infrastructure, often communicating over SSL/HTTPS to evade detection. They employ various anti-VM/AV techniques to prevent analysis of their malware.
Data Exfiltration:
Before encrypting files, Abyss Locker operators exfiltrate data from the network using tools like WinRAR and FTP clients. This data is used as leverage in ransom negotiations.
Encryption & Ransomware Deployment:
Abyss Locker encrypts files using strong encryption algorithms and appends its extension (e.g., ‘.abyss’). It targets a wide range of file types, including documents, images, and executables. After encryption, a ransom note is generated with instructions on how to contact the operators.
Recommendations:
External References:
AlienVault OTX
Sygnia Blog: Abyss Locker Ransomware Attack Analysis
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