Researchers have identified a Lua-based malware framework called ‘fast16,’ believed to date to approximately 2005, designed to manipulate computational outputs in engineering calculation software rather than steal data. If verified, this discovery would place a sophisticated cyber sabotage capability targeting engineering systems at least five years before Stuxnet, reframing assumptions about when state-level or advanced actors began targeting operational technology. No corroboration from CISA, NVD, MITRE, or primary threat intelligence sources (Dragos, Mandiant, Claroty) has been identified as of publication. This finding is sourced from [original researcher/vendor name], and should be treated as unverified intelligence requiring confirmation from authoritative OT/ICS security bodies before operational response.