![]() ![]() ![]() Numerous threat actors have exploited the Exchange Server vulnerabilities and deployed web shells in Exchange environments that grant them unauthorized access even after the vulnerabilities have been patched. ![]() Microsoft released the free tools last month to assist organizations with response and investigations. While the initial directive, released by CISA on March 3, instructed agencies on patching and mitigations, the new supplemental direction focuses on triage and improving security posture.īy noon Eastern Daylight Time (EDT) on April 5, agencies must run the latest version of Microsoft Support Emergency Response Tool (MSERT), which scans for malicious web shells, and the Test-ProxyLogon.ps1 script, which detects indicators of compromise in these attacks, before reporting the results to CISA. government agencies that use on-premises Microsoft Exchange servers and are impacted by the widely exploited zero-day vulnerabilities disclosed on March 2. On Wednesday, CISA added a new section in its emergency directive for U.S. ![]()
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