Infamous ‘FamousSparrow’ Cyberspies Exploit Microsoft ProxyLogon Vulnerability

Microsoft Exchange Server Attacks, 9 Lessons to learn
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The infamous cyberespionage group known to be operating since at least 2019 has started exploiting ProxyLogon a day after the Microsoft Exchange vulnerability was declared publicly.  The group targets hotels mainly, but has also attacked law firms, government organizations, and multinational companies.