Exchange Powershell Module Usage

Exchange Powershell Module Usage

Description

The following analytic identifies the usage of Exchange PowerShell modules that were recently used for a proof of concept related to ProxyShell. Currently, there is no active data shared or data we could re-produce relate to this part of the ProxyShell chain of exploits. \ Inherently, the usage of the modules is not malicious, but reviewing parallel processes, and user, of the session will assist with determining the intent. \ Module - New-MailboxExportRequest will begin the process of exporting contents of a primary mailbox or archive to a .pst file. \ Module - New-managementroleassignment can assign a management role to a management role group, management role assignment policy, user, or universal security group (USG).

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Exchange Powershell Module Usage Help

To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#ConfiguremoduleloggingforPowerShell.

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