The Xcode Assassin Returns: A Deep Dive Into the Latest XCSSET Version

XCSSET v40 is a sophisticated macOS malware that resurfaced in April 2026, targeting developers through supply chain attacks on Xcode projects hosted on GitHub. The malware uses a multi-stage infection chain involving memory-resident execution, polymorphic payloads, and fileless persistence to evade detection. It spreads by infecting Xcode projects and Git repositories, then downloads and executes additional modules from a command-and-control (C2) server, including a Chrome hijacking backdoor and a Telegram trojanizer. The malware disables macOS security mechanisms, blocks software updates, and manipulates browser sessions to steal credentials, cryptocurrency, and sensitive data.

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