Newly Deciphered Sabotage Malware May Have Targeted Iran's Nuclear Program
Researchers have deciphered Fast16, a sophisticated sabotage malware dating back to 2005, which may have targeted Iran's nuclear program years before Stuxnet. The malware was designed to subtly alter calculations in engineering and simulation software, potentially causing undetectable failures in research or physical systems. Its origins are likely linked to the US or an allied nation, marking a significant evolution in state-sponsored cyber operations.
- ▪Fast16 malware was created in 2005 and represents one of the earliest known examples of precision cyber sabotage.
- ▪The malware targets high-precision simulation software such as LS-DYNA, MOHID, and PKPM to subtly alter computational results.
- ▪Evidence suggests Fast16 may have been aimed at Iranian nuclear research, particularly due to LS-DYNA's use in nuclear weapons-related simulations.
- ▪Researchers Vitaly Kamluk and Juan Andrés Guerrero-Saade from SentinelOne reverse-engineered the malware, linking it to potential US or allied intelligence operations.
- ▪Fast16 may be a precursor to the Olympic Games cyber operation, which later deployed Stuxnet against Iran's nuclear facilities.
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Andy GreenbergSecurityApr 23, 2026 6:00 PMNewly Deciphered Sabotage Malware May Have Targeted Iran’s Nuclear Program—and Predates StuxnetResearchers have finally cracked Fast16, mysterious code capable of silently tampering with calculation and simulation software. It was created in 2005—and likely deployed by the US or an ally.Photo-Illustration; Jobanny Cabrera: Getty ImagesCommentLoaderSave StorySave this storyCommentLoaderSave StorySave this storyIn the history of state-sponsored hacking, the spectrum of cyber operations bent on sabotage have ranged from crude “wiper” attacks that destroy data on target computers to the legendary Stuxnet, a piece of malware the US and Israel first deployed in Iran in 2007 to silently accelerate the spinning of nuclear enrichment centrifuges until they…
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