Binance Smart Chain
Days in Operation:
100 pts each
The project token was attacked. However the attacker was front-run by another exploiter.
The root cause is BEVO is a deflation token. By invoking function deliver(), the value _rTotal will decrease and thereby influence the calculation of balance. After manipulating the token balance, the attacker invoked function skim to transfer the increased balance of PancakePair to its own account. Finally, the attacker invoked function deliver() once again and swapped the increased BEVO back to WBNB.
EOA 0x5599c paid 10 BNB (~$3k) to front-run EOA 0x68fA7 that attempted to exploit the project. 0x5599c took advantage of BEVOs reflection rate and called the skim() function to gain an extra 4.5m BEVO. The token manipulation allowed the exploiter to swap 0 BEVO for 337 BNB. The 192 WBNB flash loan was repaid, leaving the exploiter with 144 WBNB.
0x68fA7 sent an on-chain message to 0x5599c following the front run.
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