TrendMicroCAS
| where isnotempty(SrcFileName)
| where SrcFileName matches regex @'\A[a-zA-Z0-9_\-.]{1,3}\.\w+$'
| extend AccountCustomEntity = DstUserName
queryPeriod: 1h
version: 1.0.0
tactics:
- InitialAccess
queryFrequency: 1h
id: 52c4640a-1e2b-4155-b69e-e1869c9a57c9
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
- TrendMicroCAS
connectorId: TrendMicroCAS
severity: Medium
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: Name
triggerThreshold: 0
relevantTechniques:
- T1566
query: |
TrendMicroCAS
| where isnotempty(SrcFileName)
| where SrcFileName matches regex @'\A[a-zA-Z0-9_\-.]{1,3}\.\w+$'
| extend AccountCustomEntity = DstUserName
kind: Scheduled
name: Trend Micro CAS - Suspicious filename
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASSuspiciousFilename.yaml
description: |
'Detects unexpected filename.'
status: Available
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/52c4640a-1e2b-4155-b69e-e1869c9a57c9')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/52c4640a-1e2b-4155-b69e-e1869c9a57c9')]",
"properties": {
"alertRuleTemplateName": "52c4640a-1e2b-4155-b69e-e1869c9a57c9",
"customDetails": null,
"description": "'Detects unexpected filename.'\n",
"displayName": "Trend Micro CAS - Suspicious filename",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASSuspiciousFilename.yaml",
"query": "TrendMicroCAS\n| where isnotempty(SrcFileName)\n| where SrcFileName matches regex @'\\A[a-zA-Z0-9_\\-.]{1,3}\\.\\w+$'\n| extend AccountCustomEntity = DstUserName\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1566"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}