Sonne Finance Halts Operations as $20 Million Crypto Heist Devastates Platform

Lending protocol Sonne Finance experienced a hack on May 14, resulting in the theft of approximately $20 million worth of cryptocurrencies. Cyvers, a Web3 security firm, identified the ongoing attack involving Sonne Finance's USDC and WETH contracts. Despite promptly pausing operations, the hacker had already stolen a significant amount before detection. Sonne is currently investigating options to recover the stolen funds, including a possible bug bounty agreement with the exploiter. However, the exploiter has not yet responded to these attempts and has moved a portion of the loot to a new wallet address.

Sonne Finance Suspends Operations After Devastating Hack Drains $20 Million in Cryptocurrencies

May 15, 2023

In a severe blow to the decentralized finance (DeFi) ecosystem, lending protocol Sonne Finance has been forced to halt operations following a sophisticated cyberattack that siphoned approximately $20 million worth of cryptocurrencies from its platform.

Initial Detection and Response

On May 14th, at approximately 10:30 pm UTC, Web3 security firm Cyvers intercepted an ongoing attack targeting Sonne Finance's USD Coin (USDC) and Wrapped Ether (WETH) smart contracts. However, by the time Sonne Finance became aware of the situation roughly 25 minutes later, the perpetrator had already plundered significant amounts of cryptocurrency, including $20 million in WETH, VELO, soVELO, and Wrapped USDC.

Prompt Action and Investigation

Shortly after the breach was discovered, Sonne Finance swiftly took action by suspending all markets on Optimism and partnering with Cyvers to launch a comprehensive investigation. The protocol is actively exploring all avenues for recovering the stolen funds, including negotiations with the hacker for a potential bug bounty.

Negotiations and Hacker's Response

Unfortunately, the hacker has thus far been unwilling to engage in negotiations. According to blockchain investigator PeckShield, the exploiter has already transferred a substantial portion of the stolen assets (approximately $7.8 million) to a fresh wallet address.

Evasive Tactics and Privacy Concerns

The hacker's subsequent actions indicate an intent to launder the stolen funds through a privacy-enhancing protocol such as Tornado Cash. By leveraging such mechanisms, the perpetrator aims to hinder traceability and conceal the illicitly obtained cryptocurrencies.

Exploitation Root Cause Analysis

Sonne Finance's internal investigation has revealed that the attack was executed through a donation attack on Sonne's Compound v2 forks, which had a previously identified security vulnerability. Community member PoorBabyCorn has attributed the incident to Sonne Finance's decision to employ Compound v2 despite being aware of the associated risks, raising concerns about potential security breaches.

Parallel Hedge Fund Breach

In a separate incident, the main hedge fund operated by crypto institutional investment firm BlockTower Capital has reportedly fallen victim to an exploit, resulting in a partial depletion of its assets. The stolen funds remain unrecovered, and BlockTower has engaged blockchain forensic analysts to unravel the details of the breach and identify the perpetrators.

Ongoing Investigations and Security Implications

Both Sonne Finance and BlockTower Capital continue to collaborate with law enforcement and security experts to investigate the respective attacks and apprehend the responsible parties. These incidents underscore the critical importance of robust security measures and continuous due diligence within the DeFi ecosystem to safeguard user funds and maintain trust in the industry.