Unveiling a New Variant of the DarkCloud Campaign

Description

A new DarkCloud campaign was observed in July 2025, targeting Windows users with a sophisticated infection chain. The attack begins with a phishing email containing a RAR archive, which leads to the execution of obfuscated JavaScript and PowerShell code. This code downloads and deploys a fileless .NET DLL, which in turn downloads and injects the DarkCloud payload into a legitimate Windows process. The DarkCloud variant, written in Visual Basic 6, employs anti-analysis techniques and collects sensitive information from various sources, including web browsers, email clients, and FTP clients. The stolen data is exfiltrated via SMTP. The campaign demonstrates advanced evasion techniques and targets a wide range of user credentials and personal information.