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简析 Solana 算法稳定币 Nirvana 被攻击事件
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Nirvana 目前资产缺口超过 1200 万美元。如此庞大的财务压力，对于一个新生项目而言，几乎宣判了死刑。 原文标题：《暴跌 90%！Solana 算法稳定币新秀 Nirvana 被攻击事件分析》 撰文：成都链安 当你第一次听到 Nirvana 这个项目时，你的反应是不是也是这样。 Nirvana，不就是那支享誉全球的涅槃乐队吗？ 
Nirvana，对于一个喜欢摇滚乐的乐迷来说肯定很熟悉，当然，Web3 的项目方取名字也会各种蹭，当时这个算法稳定币协议 Nirvana 出来时，很多人也在疑惑这个项目是否和这支传奇乐队有关联。 后来事实证明他们毫无关系。 据悉，这个有着 Solana 算法稳定币新秀的项目，采取双代币系统：ANA，一种算法亚稳态代币，用作财富存储；由 ANA 作为抵押生成的 NIRV 代币，是一种去中心化的超级稳定币，用作价值存储。 为何这个项目在今日遭受攻击，请听我们细细分解。 北京时间 7 月 28 日中午，成都链安链必应 - 区块链安全态势感知平台舆情监测显示，基于 Solana 的去中心化算法稳定币协议 Nirvana 遭遇攻击，其稳定币 NIRV 价格从 1 美元一度跌至 0.09 美元，目前反弹至 0.11 美元，最大跌幅超过 90%；ANA 代币价格从 8.9 美元一度跌至 1.5 美元，跌幅高达 85%。 我们统计资金损失时，发现项目方损失约 357 万美元。 攻击发生时海外正值深夜，大概项目方工作人员还在睡梦中。成都链安安全团队的小伙伴，立刻跟进此事件，现将本次事件简单分析如下。 （以下直接进入技术代码分析状态） 第一步，攻击者通过调用 solend 协议的 flash loan 指令，借来了 1025WUSD，随后调用了 Nirvana 程序中的 Buy3 指令，此时根据兑换比例可以算出此时 USD/ANA 为 8.72，兑换后价格为 24.27，此时兑换前价格 / 兑换后价格约为 1/3。 
第二步，攻击者开始进入「黑化状态」，两次调用 swap 指令将获得的 ANA 兑换为 USD，价格随后分别跌至 22.73，16.47。 
第三步，成都链安安全团队通过 Github 搜索关键字【nirkXSE28jCQoK8SmKWqxXz3L9vbSRGKS24iYJj8Aeo】相关项目，但未发现存在 buy3 指令。 
第四步，被盗资金目前以通过跨链桥转移到以太坊上。成都链安链必追将持续对资金地址进行分析和追踪。 根据 Odaily 星球日报的报道，「Nirvana」目前资产缺口超过 1200 万美元。如此庞大的财务压力，对于一个新生项目而言，几乎宣判了死刑。「Nirvana」要想继续存活，也许可以效仿竞品 Beanstalk Farms 进行众筹。 好了，今天的分享就结束了，后续有动向我们将持续跟进此事件。 来源：金色财经 |
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