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Home Malware

MESHAGENT (Trojan) – Malware

February 11, 2025
Reading Time: 3 mins read
in Malware
MESHAGENT (Trojan) – Malware

MESHAGENT

Type of Malware

Trojan

Targeted Countries

Ukraine

Date of initial activity

2017

Addittional Names

ANONVNC

Associated Groups

UAC-0198

Motivation

Cyberwarfare

Attack Vectors

Phishing

Targeted Systems

Windows

Overview

MESHAGENT, a remote access tool (RAT) originally designed for legitimate purposes, has gained notoriety due to its abuse in cyberattacks. Developed by the open-source community, MESHAGENT was intended as a means for secure remote desktop access, enabling users to manage systems and provide technical support remotely. However, its versatile design and accessibility have made it a prime target for malicious actors seeking to exploit its capabilities for unauthorized access and control of compromised systems. The malware leverages a highly customizable configuration file and robust communication features, making it an attractive tool for cybercriminals and state-sponsored threat actors alike. The core functionality of MESHAGENT centers around enabling attackers to maintain persistent access to targeted systems. Once deployed, it facilitates the execution of commands, the exfiltration of sensitive data, and even the remote monitoring of systems. With its ability to bypass traditional security measures and establish covert channels of communication, MESHAGENT is often used to conduct espionage, steal intellectual property, or disrupt operations across various sectors. Its use in cyberattacks has been observed in multiple high-profile campaigns, making it a key tool in the arsenals of cybercriminal groups and hackers seeking to exploit vulnerable organizations.

Targets

Individuals Public Administration

How they operate

Upon infection, MESHAGENT typically uses a custom installer that exploits various methods to silently deploy itself onto the target system. This can be done by embedding the malware into seemingly harmless files, such as documents or software installers, often delivered via phishing campaigns or malicious downloads. Once installed, MESHAGENT establishes a connection with its command-and-control (C2) server, allowing the attacker to issue commands, monitor activity, and maintain full control over the system. The initial communication between the infected machine and the C2 server is often encrypted, making it difficult for traditional security tools to detect the malicious traffic. MESHAGENT’s operational mechanics rely on a highly flexible configuration file format, which can be customized to fit the needs of the attacker. This configuration file dictates the behavior of the malware, including its communication methods, persistence mechanisms, and specific functionalities it should enable on the compromised machine. One key feature of MESHAGENT is its use of a built-in VNC server, which allows remote desktop access to the infected machine. This enables the attacker to view the victim’s desktop in real-time and interact with it as if they were physically present, further facilitating the exfiltration of data and system manipulation. In addition to the VNC functionality, MESHAGENT also provides an array of other tools for malicious actors to exploit. These include the ability to execute arbitrary code on the compromised system, steal files, monitor system processes, and gather sensitive information such as credentials, financial data, or intellectual property. The malware is designed to maintain a low profile, often operating in the background and ensuring that the system continues to function normally, thus evading detection. To enhance its persistence, MESHAGENT can install itself in various system directories, such as the Startup folder or ProgramData directory, ensuring that it re-launches even after a reboot. It also uses obfuscation techniques, including polymorphism, to change its appearance and behavior, making it harder for security tools to detect the threat. Another significant technical aspect of MESHAGENT is its ability to hide its activities and maintain communication with its C2 server even in the face of network monitoring. MESHAGENT often uses encrypted communication channels and can disguise itself within normal network traffic, avoiding detection by traditional network traffic analyzers. Additionally, its source code is open-source, making it highly customizable for cybercriminals who can alter it to better evade detection or incorporate additional malicious functionalities. The ability to modify the code also allows attackers to target specific systems more effectively, tailoring the malware to exploit particular vulnerabilities. MESHAGENT’s modularity and adaptability contribute to its continued effectiveness as a tool for cyber espionage, data theft, and remote surveillance. The open-source nature of the malware ensures that it evolves continuously, with attackers able to adapt it to bypass emerging security measures. As cyber threats continue to grow in complexity and sophistication, understanding the technical mechanisms behind tools like MESHAGENT is essential for developing comprehensive defense strategies. Detecting and mitigating such threats require advanced security solutions that can identify suspicious behaviors, recognize the subtle signs of remote access tools, and effectively block unauthorized communication with C2 servers. As long as MESHAGENT remains an active threat, security professionals must remain vigilant, adapting their defenses to meet the ever-evolving nature of cybercrime.  
Reference: 
  • UAC-0198: Mass distribution of ANONVNC (MESHAGENT) among Ukrainian government organizations (CERT-UA#1064
Tags: ANONVNCCyberattacksCyberwarfareMalwareMeshAgentPhishingTrojanTrojansUAC-0198UkraineWindows
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