A technical analysis of an APT token theft on the Aptos blockchain dated September 19, 2026. The investigation confirms 1,552.56 APT was transferred via legitimate Aptos protocol functions from the victim's wallet to an intermediary address, then immediately bridged to USDT on Tron, ruling out smart contract exploits from three named RWA projects and pointing to either direct key compromise, seed phrase exposure, or social engineering as the theft vector.