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Eintrag vom: 13.02.2013.

The contract lacked reentrancy protection and the attacker used a fake token (ATK) with a self-destruct feature to repeatedly trigger withdrawals before balances were updated.

 

The SELFDESTRUCT instruction in Ethereum allows a contract to destroy itself and send its remaining Ether balance to a specified address. If this instruction is not properly protected with access controls an attacker could trigger it causing the contract to self-destruct and possibly transferring all the funds to an unauthorized address.

 

The SELFDESTRUCT opcode was previously used sometimes to implement an upgradable smart contract pattern by SELFDESTRUCT ing a smart contract and deploying different bytecode at the same address. This particular upgrade pattern was sometimes called the "metamorphic contract" pattern.

 

According to this information we propose a method to find the self-destructed contracts (also called predecessor contracts) and their updated version (successor contracts) by computing the code similarity.

 

What is a Self-Destruct Attack? A self-destruct attack in the context of smart contracts involves manipulating a contract?s self-destruct functionality to terminate the contract unexpectedly.