Pre-Stuxnet Fast16 Malware Tampered with Nuclear Weapons Simulations
May 18, 2026
Industrial Sabotage / Malware
A new analysis of the Lua-based fast16 malware has confirmed that it was a cyber sabotage tool designed to tamper with nuclear weapons testing simulations. According to Broadcom-owned Symantec and Carbon Black teams, the pre-Stuxnet tool was engineered to corrupt uranium-compression simulations that are central to nuclear weapon design. "Fast16's hook engine is selectively interested in high-explosive simulations inside LS-DYNA and AUTODYN," the Threat Hunter Team said . "The malware checks for the density of the material being simulated and only acts when that value passes 30 g/cm³, the threshold uranium can only be reached under the shock compression of an implosion device. The development comes weeks after SentinelOne presented an analysis of fast16, describing it as the first sabotage framework whose components may have developed as early as 2005, predating the earliest known version of Stuxnet (aka Stuxnet 0.5) by two years. Evidence unearthed by the cybe...
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