DarkCloud: An Advanced Stealer Malware Sold on Telegram to Target Windows Data

DarkCloud, a highly advanced stealer malware, has emerged as a significant threat to Windows systems since its debut in 2022.

Initially gaining traction through underground forums, the malware is now widely sold on Telegram, making it accessible to cybercriminals worldwide.

DarkCloud employs a variety of distribution techniques, with phishing campaigns being the most prevalent.

Attackers frequently disguise malicious payloads as invoices or fines, targeting HR departments and unsuspecting users.

Other methods include malvertising, watering hole attacks, and bundling with other malware such as DbatLoader or ClipBanker.

Once executed, DarkCloud initiates a multi-stage infection process.

Victims are often tricked into downloading compressed files containing loaders or scripts written in languages like PowerShell or JAR.

These scripts obfuscate the malware’s next stage, which is either downloaded or extracted from encrypted resources.

The final payload is injected directly into memory, enabling the malware to evade detection while stealing sensitive information such as browser data, FTP credentials, and even credit card details.

Technical Capabilities and Persistence Mechanisms

DarkCloud’s technical sophistication is evident in its ability to execute complex tasks while maintaining stealth.

The malware employs various persistence mechanisms, including creating startup scripts, modifying registry keys, and scheduling tasks.

For example, it may generate obfuscated VBS files in startup directories or inject itself into legitimate processes like svchost or .NET executables.

According to the Report, this ensures that the malware remains active even after system reboots.

The stealer’s capabilities extend beyond data theft.

It functions as a keylogger, captures screenshots, and monitors running processes.

Additionally, it targets a wide range of applications, including web browsers (Chrome, Firefox), email clients (Outlook), and password managers.

By querying system paths and registry entries, DarkCloud collects login credentials, email configurations, and other sensitive data stored on the victim’s machine.

Telegram Integration for Command and Control

A notable feature of DarkCloud is its integration with Telegram for command-and-control (C2) operations.

The malware communicates with Telegram bots to exfiltrate stolen data and receive commands from attackers.

This approach not only simplifies deployment for cybercriminals but also complicates detection by security tools due to the use of legitimate communication channels.

DarkCloud’s evolution highlights the growing sophistication of stealer malware in the cybercrime ecosystem.

Its widespread availability on Telegram underscores the need for organizations to strengthen their defenses against phishing attacks and implement robust endpoint security measures to mitigate such threats effectively.

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