ACryptoS, a DeFi yield aggregator, has ceased operations after an exploit drained approximately $665,000 from 77 vaults across five chains. A lack of input validation allowed the attacker to deposit minimal token amounts and mint the vast majority of vault shares. The stolen funds were moved through multiple cross-chain protocols. ACryptoS offered a 10% bounty for the return of the assets and urged users to withdraw their remaining funds immediately while withdrawals remain open.