Foresight News 消息，据 Cointelegraph 报道，安全公司 Koi Security 表示，网络犯罪团伙 GreedyBear 通过数百个假钱包扩展程序、恶意软件类型和诈骗网站，已累计盗取超 100 万美元加密货币。Koi Security 已在火狐浏览器应用商店发布超 150 个恶意浏览器扩展程序，每个扩展程序都设计成模仿 MetaMask、TronLink、Exodus 和 Rabby Wallet 等加密钱包的样式。攻击者使用 Extension Hollowing 技术，首先创建合法扩展以绕过市场检查，随后将其改造成恶意扩展。
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