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KQL OPERATOR: WHERE
Description:
The where operator in Kusto Query Language (KQL) is used to filter data based on specific criteria. For a security analyst working with Microsoft Defender for Endpoint (MDE), this operator is essential for identifying and analysing specific events or patterns in the data.
Use-Cases (leveraging the DeviceNetworkEvents Table):
#1 Basic usage:
This command 👇 filters all network events where the remote IP is "192.168.50.1"
DeviceNetworkEvents | where RemoteIP == '192.168.50.1'
#2 Search for specific action types:
With this 👇, the analyst receives all network events where the action was 'HttpConnectionInspected'.
DeviceNetworkEvents
| where ActionType == "HttpConnectionInspected"
WHEN TO USE IT:
- to identify and analyse specific events or patterns
- in combination with other operators to create complex queries.
THINGS TO KEEP IN MIND:
The where operator can affect performance, especially with large amounts of data. It is advisable to make the query as specific as possible.
References:
Use the where operator - Training | Microsoft Learn
Use the where operator
where operator - Kusto
Learn how to use the where operator to filter a table to the subset of rows that satisfy a predicate.
DeviceNetworkEvents table in the advanced hunting schema - Microsoft Defender XDR
Learn about network connection events you can query from the DeviceNetworkEvents table of the advanced hunting schema