Delta Prime, a decentralized finance (DeFi) protocol on the Arbitrum network, has suffered a significant security breach resulting in the loss of approximately $6 million. The incident occurred due to a compromised private key, which allowed the attacker to upgrade the proxy and drain various token pools. The stolen funds, amounting to $5.93M, were subsequently moved to a new address and laundered through Tornado Cash. The attacker gained control of the private key of 0x40e4ff9e018462ce71fa34abdfa27b8c5e2b1afb. The breach has led to a 40% drop in Delta Prime's total value locked (TVL) as users rushed to withdraw their assets. The incident is under investigation, with some links to North Korea being explored. Delta Prime Red (Avalanche) remains unaffected.