North Korea's Expanding Crypto Theft Strategy Hits DeFi

Less than three weeks after hackers linked to North Korea used social engineering to breach crypto trading firm Drift, another major exploit has been carried out on Kelp, a restaking protocol connected to LayerZero's cross-chain infrastructure. This attack suggests an evolution in the tactics of North Korea-linked hackers, who are now exploiting fundamental assumptions in decentralized systems, not just looking for vulnerabilities or stolen credentials. The combined incidents point to a more organized effort by North Korea to hijack crypto sector funds. According to Alexander Urbelis, chief information security officer and general counsel at ENS Labs, 'This is not a series of incidents; it is a cadence. You cannot patch your way out of a procurement schedule.' More than $500 million was siphoned off across the Drift and Kelp exploits in just over two weeks. The Kelp breach did not involve breaking encryption but rather manipulating data inputs to force the system to approve non-existent transactions. As David Schwed, COO of blockchain security firm SVRN, noted, 'This attack wasn’t about breaking cryptography; it was about exploiting how the system was set up.' A key issue was Kelp's reliance on a single verifier to approve cross-chain messages, a configuration choice that removed a critical safety layer. The fallout has spread beyond Kelp, affecting lending platforms like Aave that accepted impacted assets as collateral, turning a single exploit into a wider stress event. This exposes a gap between the marketing of decentralization and its actual implementation, with Schwed stating, 'A single verifier is not decentralized; it’s a centralized decentralized verifier.' Urbelis adds, 'Decentralization is not a property a system has. It is a series of choices. And the stack is only as strong as its most centralized layer.' The shift in attackers' focus towards cross-chain and restaking infrastructure, the 'plumbing' of the crypto industry, may explain recent targeting. These layers are critical, complex, and hold large amounts of value, making them attractive targets. As attackers adapt, the biggest risk may not be unknown vulnerabilities but known ones that are not fully addressed, with the Kelp exploit showing how exposed the ecosystem remains to familiar weaknesses, especially when security is treated as a recommendation rather than a requirement.