In our screenshot below, the Safety Scanner reported no detectable threats.Īs of March 18th, Windows Defender Antivirus can now detect and remediate known malware used in the March 2nd exploits. All scans performed by the Safety Scanner are logged in this file. The Safety Scanner will inform you of any malware detected, whether it was able to remove that malware, and any additional actions you may need to take (such as rebooting the server).įor a log of all detections and actions taken by the Safety Scanner, navigate to C:\Windows\Debug\msert.log. If you have a database availability group, consider putting the server into maintenance mode so that you can run the scanner with zero user impact. Note that it takes a few hours to run a scan, and it may spike your CPU, so it’s best to do this during a maintenance window. This is a self-executing program that can be downloaded here. Once you are fully patched, I recommend running the Microsoft Safety Scanner (also known as the Microsoft Emergency Response Tool), which detects and remediates all known malware. Note that applying the security patch and then upgrading to an older CU (rather than the latest) will expose your organization to the exploits again. This aided organizations that could not yet upgrade to the latest cumulative update. Note: On March 8th Microsoft updated the security patch allowing it to be installed on older cumulative updates. Those on Exchange 2010 need to install rollup 32.Those on Exchange 2013 will need to install Cumulative Update 23 (released June 2019), followed by the March 2nd, 2021 security patch.Those on Exchange 2016 or 2019 should apply the latest cumulative update.HAFNIUM, a cyberespionage group with ties to the Chinese government, has leveraged these Exchange Server exploits to infiltrate victims’ networks to deliver malware and other malicious payloads with varying motives, primarily to exfiltrate confidential data. It is imperative to protect yourself from the exploits published on March 2nd. Exchange 2010 SP3 Rollup 32 | KB5000978 (March 2nd Security Patch) Tackling the March 2nd security exploits
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