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Merge pull request #1245 from MicrosoftDocs/repo_sync_working_branch

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Confirm merge from repo_sync_working_branch to master to sync with https://github.com/MicrosoftDocs/windows-itpro-docs (branch public)
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10
windows/security/threat-protection/microsoft-defender-atp/custom-detection-rules.md
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@ -36,6 +36,16 @@ 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.
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
```
### 2. Create new rule and provide alert details.
With the query in the query editor, select **Create detection rule** and specify the following alert details: