VERDICT —OUT OF SCOPE
Root cause is a frontend / UI hijack — users authorized the malicious transaction from a compromised site or DNS. On-chain contract was not the failure surface; pre-deployment audit cannot catch this class.
▰ METHOD
Frontend Attack
FRONTEND
Root cause
Root-cause analysis not yet published. The incident description below contains all currently available signal — review the attack transaction directly for definitive forensics.
▰ PROOF OF CONCEPT
DEFIHACKLABS
src/test/2023-08/Balancer_exp.sol
view forked test on github ↗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.
Forensic narrative
Classification: Protocol Logic. Technique: Frontend Attack. Target type: DeFi Protocol. Affected chains: Ethereum.
Sourced from
DefiLlama Hacks dataset · api.llama.fi/hacks
Technical record
- chain
- ethereum
- protocol
- Balancer V2
- bug_class
- frontend
- date_occurred
- 2023-09-19
- loss_usd
- $238,000
- classification
- Protocol Logic
- technique
- Frontend Attack
- target_type
- DeFi Protocol
- source_id
- dl:2611
Related — same bug class· frontend