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This query detects unusual file content created by UMWorkerProcess, indicating exploitation of CVE-2021-26858 to generate a web shell. More related queries can be found on the Microsoft Security Response Center blog.
| Attribute | Value |
|---|---|
| Type | Hunting Query |
| Solution | Web Shells Threat Protection |
| ID | 60d15bd4-1fad-4a70-bc3b-094dc1c5e554 |
| Tactics | Execution, Persistence, Exploit |
| Required Connectors | MicrosoftThreatProtection |
| Source | View on GitHub |
This content item queries data from the following tables:
| Table | Transformations | Ingestion API | Lake-Only |
|---|---|---|---|
DeviceFileEvents |
✓ | ✗ | ? |
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