Yearn Finance has successfully recovered $2.4 million after a significant hack on November 30, which exploited an arithmetic bug to mint an enormous amount of yETH, draining nearly $9 million from two DeFi pools. The recovery was part of a coordinated effort involving Plume Network, Dinero, SEAL911, and ChainSecurity, which managed to trace and recover 857.49 pxETH. The attack targeted a specific contract, which was isolated to prevent further damage, ensuring that Yearn Finance's V2 and V3 vaults remained unaffected. The hacker employed self-destructing contracts and Tornado Cash to obscure their transactions, complicating the recovery process.