Threats Tagged 'application-bound encryption bypass'

A sophisticated 64-bit information-stealing malware named Remus has emerged as a direct evolution of the notorious Lumma Stealer. Following the doxxing of alleged Lumma core members between August and October 2025, developers created this advanced variant, with test builds appearing in September 2025 and live campaigns starting February 2026. Remus employs innovative techniques including injecting custom 51-byte shellcode into browser memory to extract protected master keys, bypassing Application-Bound Encryption in Chromium-based browsers. The malware utilizes EtherHiding through Ethereum smart contracts for command-and-control resolution, making infrastructure takedowns nearly impossible. It targets browser credentials, session cookies, and cryptocurrency wallets while implementing rigorous anti-analysis checks to evade security research environments.

Gen Threat Labs has identified Remus, a new 64-bit infostealer attributed to the Lumma Stealer family, emerging after Lumma's takedown and the doxxing of its alleged core members. First campaigns date back to February 2026, with the malware switching from Steam/Telegram dead drop resolvers to EtherHiding and employing new anti-analysis checks. Remus shares multiple characteristics with Lumma including identical string obfuscation techniques, AntiVM checks, direct syscall/sysenter handling, indirect control flow obfuscation, and a unique Application-Bound Encryption bypass. The analysis details test builds labeled Tenzor from September 2025, representing a transitional step between Lumma and Remus. While maintaining Lumma's stealing arsenal for browser passwords, cookies, and cryptocurrency, Remus introduces blockchain-based C2 resolution via EtherHiding, additional anti-sandbox checks targeting analysis tool DLLs, and enhanced device fingerprinting capabilities.