Incident Overview
The attacker's address:
https://etherscan.io/address/0xa8189407…f55908
The transactions behind the attack :
https://etherscan.io/tx/0x713c2ce2…9bf069
https://bscscan.com/tx/0xdf719d25…cc3387
https://hecoinfo.com/tx/0xecde0b38…366438
The attacker used a bug in the calculations that are different from Uniswap. Due to fact that all tokens sit in one contract, he escalated it by:
- adding two fake tokens
- adding liquidity between both tokens and WETH/fake token
- swapping between UNI/WETH/fake tokens
- removing liquidity
Total funds were stolen:
- 80 ETH (Ethereum)
- 10,000 DAI (Ethereum)
- 45,000 USDT (HECO)
Stolen funds were deposited into Tornado Cash mixer:
https://bloxy.info/txs/calls_from/0xa8189407…f55908?signature_id=994162&smart_contract_address_bin=0x722122df…5b6967
Incident Report
Protocol Information
What the Attacker Needed to Succeed
Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.
What Auditors Should Check
If you're auditing a protocol with similar architecture to SashimiSwap, these are the critical security checks that could have prevented this incident (December 2021).
- Verify all logic paths related to Flash Loan Attack are guarded by proper access controls and input validation - see the Flash Loans Attacks attack class for patterns
- Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs
Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.
Free TrialSecurity Audit History
- Audit Report 1 Report
Related Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Sources & References
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