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Update custom-detection-rules.md

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Editing the file directly to reduce back and forth.
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Louie Mayor 2019-10-01 07:49:08 -07:00 committed by GitHub
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windows/security/threat-protection/microsoft-defender-atp/custom-detection-rules.md
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@ -36,13 +36,15 @@ In Microsoft Defender Security Center, go to **Advanced hunting** and select an
> [!NOTE]
> To use a query for a custom detection rule, the query must return the `EventTime`, `MachineId`, and `ReportId` columns in the results. Queries that don’t use the `project` operator to customize results usually return these common columns.
> [Example]
> MiscEvents
The sample query below counts the number of unique machines (`MachineId`) with antivirus detections and uses this count to find only the machines with more than five detections. To return the latest `EventTime` and the corresponding `ReportId`, it uses the `summarize` operator with the `arg_max` function.
```
MiscEvents
| where EventTime > ago(7d)
| where ActionType == "AntivirusDetection"
| summarize (EventTime, ReportId)=arg_max(EventTime, ReportId), count() by MachineId
| where count_ > 5
This will fetch the EventTime and ReportId of the latest event from multiple events returned by the query and adds the count by MachineId.
```
### 2. Create new rule and provide alert details.