Root-cause analysis not yet published. The incident description below contains all currently available signal — review the attack transaction directly for definitive forensics.
Reproducible Foundry test fork from SunWeb3Sec/DeFiHackLabs. Clone the repo, run forge test against the file path above, and replay the exploit against a mainnet fork at the historical block. Use for reproduction only — not for live targets.
Uniswap V3 liquidity management protocol Visor Finance was hacked again. Hackers took advantage of the loopholes to withdraw more than 8.8 million VISRs and sold them on Uniswap, causing the VISR tokens to plummet by nearly 95% and profit over 120 ETH through Tornado Cash. Money laundering. According to SlowMist analysis, this attack is due to a flaw in the RewardsHypervisor contract when checking the permissions of the user's recharge, causing the attacker to construct a malicious contract to arbitrarily cast mortgage credentials. Prior to this June, Visor Finance was also hacked and lost more than US$500,000. Attack method (per SlowMist): Contract Vulnerability. Reported loss: 120 ETH.
- chain
- —
- protocol
- Visor Finance
- bug_class
- logic
- date_occurred
- 2021-12-22
- loss_usd
- —
- source_id
- sm:visor-finance::2021-12-22