Apparently someone drained a Balancer Pool made up of WETH and STA and got away with $500k worth of WETH.
To be clear, from what I understand, this isn’t a Balancer issue but a Statera issue. Their token is deflationary which causes some weird accounting issue.
Correction: It was a multi-asset pool
https://pools.balancer.exchange/#/pool/0x0e511Aa1a137AaD267dfe3a6bFCa0b856C1a3682
https://pools.balancer.exchange/#/pool/0x0e511Aa1a137AaD267dfe3a6bFCa0b856C1a3682
The @1inchExchange team wrote up a summary and wow what a sophisticated attack. https://medium.com/@1inch.exchange/balancer-hack-2020-a8f7131c980e
And here is Balancer Lab’s take https://twitter.com/balancerlabs/status/1277404809679769601?s=21