AI Summary

A Russian state-sponsored hacking group has been exploiting a previously unknown vulnerability in Microsoft Exchange's Outlook Web Access to gain long-term access to email users' mailboxes. This vulnerability, known as a zero-day exploit, allows the hackers to deliver a sophisticated backdoor called OWAReaper, which enables them to maintain access to the compromised mailboxes. The implications of this exploit are significant, as it allows the hackers to maintain a persistent presence within the compromised systems, potentially enabling further malicious activity.

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