Trend Micro CAS - Suspicious filename

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Id	52c4640a-1e2b-4155-b69e-e1869c9a57c9
Rulename	Trend Micro CAS - Suspicious filename
Description	Detects unexpected filename.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566
Required data connectors	TrendMicroCAS
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASSuspiciousFilename.yaml
Version	1.0.0
Arm template	52c4640a-1e2b-4155-b69e-e1869c9a57c9.json

KQL

TrendMicroCAS
| where isnotempty(SrcFileName)
| where SrcFileName matches regex @'\A[a-zA-Z0-9_\-.]{1,3}\.\w+$'
| extend AccountCustomEntity = DstUserName

YAML

description: |
    'Detects unexpected filename.'
tactics:
- InitialAccess
severity: Medium
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
queryFrequency: 1h
triggerOperator: gt
status: Available
query: |
  TrendMicroCAS
  | where isnotempty(SrcFileName)
  | where SrcFileName matches regex @'\A[a-zA-Z0-9_\-.]{1,3}\.\w+$'
  | extend AccountCustomEntity = DstUserName  
name: Trend Micro CAS - Suspicious filename
version: 1.0.0
triggerThreshold: 0
id: 52c4640a-1e2b-4155-b69e-e1869c9a57c9
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASSuspiciousFilename.yaml
relevantTechniques:
- T1566
queryPeriod: 1h
kind: Scheduled
requiredDataConnectors:
- dataTypes:
  - TrendMicroCAS
  connectorId: TrendMicroCAS

ARM