Alerts for impaired communications
Hi All, I am wondering what others are doing to trigger alerts for impaired communications. If an attacker compromises a server the first thing they will do is try to turn off Defender features or impair communications. I was thinking of adding a custom KQL query to an analytics rule. Wanted to see what others are doing?
Defender impaired communications something like:
DeviceInfo
| where Timestamp > ago(30m)
| where OSPlatform startswith "WindowsServer"
| where DeviceType == "Server"
| where SensorHealthState in ("Impaired communications", "No sensor data", "Inactive")
| where not(RegistryDeviceTag =~ "Decommissioned")
| project Timestamp, DeviceName, SensorHealthState, OSPlatform, DeviceType
Posted Apr 1, 2026, 8:18 PM UTC
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