Microsoft IOC Detection Tool for Exchange Server Vulnerabilities


Microsoft has released an updated script that scans Exchange log files for indicators of compromise (IOCs) associated with the vulnerabilities disclosed on March 2, 2021.

National CSIRT-CY is aware of widespread domestic and international exploitation of these vulnerabilities and strongly recommends organizations run the Test-ProxyLogon.ps1 script as soon as possible to help determine whether their systems are compromised.

For additional information on the script, see Microsoft’s blog HAFNIUM targeting Exchange Servers with 0-day exploits

For more information about these vulnerabilities and how to defend against their exploitation, see:

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