Exchange IIS Worker Dropping Webshells

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This query checks for the IIS worker process dropping files that resemble web shells and other artifacts seen in known attacks. Reference: https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server

Attribute Value
Type Hunting Query
Solution Web Shells Threat Protection
ID 42e7df5b-80f6-49a5-946a-08026ec24807
Tactics Execution, Persistence
Required Connectors MicrosoftThreatProtection
Source View on GitHub

Tables Used

This content item queries data from the following tables:

Table Selection Criteria Transformations Ingestion API Lake-Only
DeviceFileEvents FolderPath !endswith ".ini"
FolderPath !endswith ".js"
FolderPath !endswith ".json"
FolderPath !endswith ".log"
FolderPath !endswith ".tmp"
FolderPath !endswith ".vb"
FolderPath !endswith ".xml"
FolderPath has_any "\\wwwroot\\"
InitiatingProcessCommandLine contains "MSExchange"
InitiatingProcessFileName == "w3wp.exe"
?

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