AMOS

MacSync Malware Evolves to Steal Cryptocurrency and Conceal Components in iCloud

Updated MacSync malware for macOS now arrives bundled with a stealer and backdoor, allowing attackers to harvest browser history, cookies, passwords, Telegram data, and cryptocurrency wallet details while maintaining persistent remote access. Discovered by Kaspersky researchers in September 2026, the new variant uses a multi-stage infection chain that begins with a fake application download, such as a document collaboration tool or crypto wallet. One component is delivered through a publicly shared iCloud calendar entry in ICS format, bypassing traditional loaders. After execution, MacSync requests administrator credentials, displays a fake macOS damage notification, and installs the stealer alongside a Finder-masquerading backdoor. The backdoor enables arbitrary code execution, file theft, browser extension installation, and replacement of the legitimate Ledger application with a malicious version to drain cryptocurrency funds. Users are advised to download software only from trusted sources and remain cautious of unexpected administrator password prompts.