Exchange Powershell Abuse Via Ssrf

Exchange Powershell Abuse Via Ssrf

Description

This analytic identifies suspicious behavior related to ProxyShell against on-premise Microsoft Exchange servers. \ Modification of this analytic is requried to ensure fields are mapped accordingly. \ A suspicious event will have PowerShell, the method POST and autodiscover.json. This is indicative of accessing PowerShell on the back end of Exchange with SSRF. \ An event will look similar to POST /autodiscover/autodiscover.json a=dsxvu@fnsso.flq/powershell/?X-Rps-CAT=VgEAVAdXaW5kb3d... (abbreviated) \ Review the source attempting to perform this activity against your environment. In addition, review PowerShell logs and access recently granted to Exchange roles.

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Exchange Powershell Abuse Via Ssrf Help

The following analytic requires on-premise Exchange to be logging to Splunk using the TA - https://splunkbase.splunk.com/app/3225. Ensure logs are parsed correctly, or tune the analytic for your environment.

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