Incident Overview
BNO Pool was exploited due to incorrect reward calculation, resulting in a loss of 504,217 $USD.
The BNO pool, which supports both ERC20 and NFT staking, fell victim to an exploit. The attacker exploited an incorrect reward calculation issue and was able to drain the pool for 504,217 $USD. The exploit was executed in two transactions.
In the first transaction, the attacker drained over 700,000 $BNO tokens from the pool. The second transaction drained an additional 700,000 $BNO tokens, which were subsequently sold on PancakeSwap for $USDT.
Attacker Address:
https://bscscan.com/address/0xA6566574…2677fB
Funds Holder Address: https://bscscan.com/address/0xdc109426…d3c8cc
Malicious Transaction:
https://bscscan.com/tx/0x33fed54d…0096b9
https://bscscan.com/tx/0x16d75e42…76cc31
Malicious Contract Address:
https://bscscan.com/address/0xd138b9a5…1c13cd
Incident Report
Protocol Information
Market Context at Time of Hack
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 BNO, these are the critical security checks that could have prevented this incident (July 2023).
- Verify all logic paths related to Rugpull are guarded by proper access controls and input validation
- 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.
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