The patches for these vulnerabilities were released on March 8 th, 2021. CISA and FBI assessed that the threat actors could exploit these vulnerabilities collectively tracked as ProxyLogon, to compromise networks, steal information, encrypt data for ransom, execute destructive attacks, and/or sell access to compromised networks on the Dark Web. Cybersecurity and Infrastructure Security Agency (CISA), and the Federal Bureau of Investigation (FBI), issued a joint advisory addressing the disclosed vulnerabilities in Microsoft Exchange Server (Cybersecurity & Infastructure Security Agency, 2021). This threat is high and is estimated to affect over 30,000 businesses worldwide. The attack, launched by Hafnium, targeted these vulnerabilities (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065) which allowed state sponsored threat actors to exploit Internet facing Exchange servers, gaining access to access to internal systems (Microsoft, 2021). To remove this tool, you need to delete the downloaded msert.exe file.On MaMicrosoft published a detailed report outlining four previously unknown “Zero Day” vulnerabilities in Microsoft Exchange Server. Note: Microsoft Safety Scanner is a portable executable and does not appear in the Windows Start menu or as an icon on the desktop. Right-click and select Run as administrator. Once you have downloaded the file Microsoft Safety Scanner Tool (MSERT).
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