Sentora Flags Growing Threat of Off-Chain DeFi Hacks Targeting Protocol Wallets

DeFi analytics firm Sentora, formerly known as IntoTheBlock, has issued a warning about a rising trend in off-chain and hybrid hacking incidents targeting decentralized finance protocols. While the majority of DeFi exploits still occur directly on-chain, Sentora noted on its official X account that attackers are increasingly shifting their focus to compromising the wallets that control protocol operations.

The Shift from Smart Contract Exploits to Wallet Compromise

For years, the DeFi security conversation has centered on smart contract vulnerabilities. Audits have become a standard prerequisite for protocol launches, and firms invest heavily in code reviews to prevent on-chain exploits. However, Sentora’s latest analysis highlights a critical blind spot: even the most thoroughly audited smart contract is vulnerable if the wallet with administrative control over the protocol is compromised.

Attackers are now using phishing campaigns, malware, and social engineering to steal private keys or gain access to the multisignature wallets that govern protocol upgrades, fund management, and emergency functions. Once they control these wallets, they can drain liquidity pools, mint tokens, or pause withdrawals — all without ever touching the underlying smart contract code.

Hybrid Attacks: The New Frontier

Sentora specifically flagged the emergence of hybrid attacks that combine on-chain and off-chain vectors. In these scenarios, an attacker might use off-chain methods to obtain partial access or information, then execute an on-chain exploit that would otherwise be impossible. This layered approach makes detection more difficult and gives security teams less time to respond.

The trend is particularly concerning for protocols that rely heavily on centralized administrative keys, a common practice in many DeFi projects that still retain upgrade capabilities. Even decentralized autonomous organizations (DAOs) can be vulnerable if their governance processes rely on wallets controlled by a small group of individuals.

Why This Matters for DeFi Users

For the average DeFi user, Sentora’s warning underscores that security due diligence must extend beyond checking whether a protocol has been audited. Users should evaluate a protocol’s operational security practices, including how administrative keys are stored, whether multisignature wallets require hardware security modules, and what procedures are in place for responding to a wallet compromise.

The shift toward off-chain attacks also has implications for insurance providers, who may need to reassess risk models that primarily account for smart contract failures rather than wallet-level breaches.

Conclusion

Sentora’s alert serves as a timely reminder that the DeFi security landscape is evolving. As on-chain defenses improve, attackers are adapting their tactics. Protocols must now treat wallet security with the same rigor as smart contract audits, implementing robust key management, hardware security, and continuous monitoring for phishing and malware threats. For the industry to mature, the definition of a secure protocol must expand to include both code and the human and operational layers that control it.

FAQs

Q1: What is an off-chain DeFi hack?
An off-chain DeFi hack targets the infrastructure outside the blockchain, such as the private keys, administrative wallets, or governance systems that control a protocol. Attackers use phishing, malware, or social engineering to gain access rather than exploiting smart contract code.

Q2: How can a protocol be hacked if its smart contract is audited?
An audited smart contract can be secure on its own, but if the wallet that controls the contract’s administrative functions (like upgrades or fund transfers) is compromised, the attacker can drain funds or manipulate the protocol without breaking the contract’s code.

Q3: What can DeFi users do to protect themselves from off-chain hacks?
Users should research a protocol’s operational security practices, including how administrative keys are stored and whether they use hardware security modules. Using hardware wallets for personal accounts and avoiding phishing links are also critical steps.