This query is designed to analyze network events where specific network signatures have been inspected. It is applicable to both Defender XDR and Sentinel platforms. Here's a simple breakdown of what the query does:

1. Data Source: It starts by looking at the DeviceNetworkEvents table, which contains records of network-related activities.

2. Filter: It filters the data to only include events where the ActionType is "NetworkSignatureInspected". This means it focuses on events where network signatures have been checked or analyzed.

3. Extract Information: It extracts two pieces of information from the AdditionalFields column:

   • SignatureName: The name of the network signature that was inspected.
   • SignatureMatchedContent: The content that matched the signature (though this is extracted, it is not used further in the query).

4. Summarize: It counts how many times each unique SignatureName appears in the filtered data. This gives an idea of which network signatures are being inspected most frequently.

5. Visualize: Finally, it creates a pie chart to visually represent the count of each SignatureName, with the chart titled "Inspected Network Signatures". This helps in quickly understanding the distribution of inspected network signatures.

In summary, the query identifies and visualizes the frequency of different network signatures being inspected in network events.