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Lumma Infostealer is a sophisticated information-stealing malware that targets high-value credentials and sensitive assets on Windows systems. It is distributed through a Malware-as-a-Service (MaaS) model, allowing inexperienced attackers to conduct data theft campaigns. Lumma is primarily deployed via phishing campaigns disguised as cracked or pirated software, often hosted on legitimate platforms like MEGA Cloud. Upon execution, Lumma uses a multi-stage decryption process and process injection techniques to activate its payload while evading detection. The latest samples utilize the Nullsoft Scriptable Install System (NSIS) as a deceptive installer, extracting malicious payloads into the %Temp% directory and launching a counterfeit document that triggers a sequence of commands to deploy Lumma’s core. Once activated, Lumma communicates with command-and-control servers (including rhussois[.]su, diadtuky[.]su, and todoexy[.]su) to gather stored browser credentials, session cookies, Telegram data, remote access configuration files, and cryptocurrency wallet information, which is then exfiltrated for exploitation. The malware avoids detection by checking for security solutions and has a modular architecture that complicates signature-based detection. Effective detection requires behavior-based Endpoint Detection and Response (EDR) systems that monitor real-time activities. To mitigate exposure, security professionals recommend avoiding storing credentials in browsers, enforcing multi-factor authentication (MFA), and monitoring suspicious processes. Indicators of Compromise (IoC) include: - E6252824BE8FF46E9A56993EEECE0DE6 - E1726693C85E59F14548658A0D82C7E8 - 19259D9575D229B0412077753C6EF9E7 - 2832B640E80731D229C8068A2F0BCC39 Command-and-control domains include: - diadtuky[.]su - rhussois[.]su - todoexy[.]su