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MediumMicrosoft Sentinel analyticsMicrosoft Security Research

Silk Typhoon Suspicious Exchange Request

This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by Silk Typhoon actors. The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers. Reference:…

Description

This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by Silk Typhoon actors. The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers. Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/

Detection logic

Detection requirements

Platform
ContainersESXiIaaSLinuxmacOSNetwork DevicesWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
azuremonitor_iis
Log source service
w3ciislog

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