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根据 Ars Technica 的报道，该漏洞被评为最高严重级别（max-severity），针对的是未打补丁的 Exchange 服务器。攻击者利用此漏洞后，能够在目标服务器上获得持久化访问权限。报道特别指出，这种持久性远超常规攻击手段——即便管理员更换了账号凭证（credential rotation），甚至对磁盘进行重新镜像（disk re-imaging），后门依然能够保留。这意味着攻击者可能已经将恶意代码植入到服务器固件或更深层的系统组件中，而非仅停留在操作系统或应用层面。
报道将攻击者指向"克里姆林宫黑客"（Kremlin hackers），即与俄罗斯政府存在关联的网络攻击组织。原文未提供具体的组织名称或攻击活动代号，也未披露受影响组织的数量与行业分布。从攻击手法来看，利用 Exchange 服务器漏洞进行初始入侵并建立长期驻留，符合国家级网络间谍活动的典型特征：目标通常是政府机构、智库、关键基础设施运营商或具有情报价值的企业。
Exchange 服务器长期以来是高价值攻击目标。微软曾多次发布紧急安全更新，修复被活跃利用的 Exchange 漏洞。此次事件再次凸显了未及时打补丁的邮件服务器所面临的风险。原文未提供该漏洞的 CVE 编号、微软官方通告链接或具体修复版本信息，建议相关管理员关注微软安全响应中心（MSRC）的后续公告，并优先对暴露在公网的 Exchange 服务器进行排查与更新。
Russian state hackers are using a maximum-severity vulnerability in Microsoft Outlook’s Exchange Server to backdoor unpatched machines and steal credentials and other confidential information from them, security researchers said Thursday.
The attacks are coming from TA488, a tracking name for a group working on behalf of the Kremlin, Proofpoint researchers said Thursday. Proofpoint and the National Security Agency jointly warned last week that the group, also tracked as Laundry Bear and Void Blizzard, had been carrying out similar attacks by exploiting a zero-day vulnerability in an email service from Zimbra. The revelation that TA488 is also exploiting the Exchange Server vulnerability to install advanced malware when a user does nothing other than open an email sent to an Outlook Web Access (OWA) account has elevated the group’s profile and assessments of its abilities.
Doubling down “TA488 is doubling down on the use of ‘half-click’ exploits—where opening the email is enough to trigger compromise—with significantly improved loading mechanisms, techniques, and malware, signaling an improvement in the group’s tradecraft and capability,” Proofpoint researchers wrote. “This novel infection chain ends with a previously unknown JavaScript browser-based implant we call OWAReaper, purpose-built for persistent access inside OWA.”