Trend Micro CAS - Unexpected file on file share
Id | de54f817-f338-46bf-989b-4e016ea6b71b |
Rulename | Trend Micro CAS - Unexpected file on file share |
Description | Detects unexpected files on file share. |
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/TrendMicroCASUnexpectedFileOnFileShare.yaml |
Version | 1.0.0 |
Arm template | de54f817-f338-46bf-989b-4e016ea6b71b.json |
let f_types = dynamic(['ps1', 'bat', 'scr', 'sh', 'exe', 'js', 'lnk']);
TrendMicroCAS
| where EventCategoryType in~ ('sharepoint', 'onedrive', 'dropbox', 'box', 'googledrive')
| where isnotempty(SrcFileName)
| extend file_type = extract(@'\.(\w+)$', 1, SrcFileName)
| where file_type in~ (f_types) or SrcFileName !contains @'.'
| extend AccountCustomEntity = DstUserName
description: |
'Detects unexpected files on file share.'
queryPeriod: 1h
name: Trend Micro CAS - Unexpected file on file share
triggerThreshold: 0
tactics:
- InitialAccess
severity: Medium
kind: Scheduled
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
queryFrequency: 1h
triggerOperator: gt
id: de54f817-f338-46bf-989b-4e016ea6b71b
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASUnexpectedFileOnFileShare.yaml
version: 1.0.0
query: |
let f_types = dynamic(['ps1', 'bat', 'scr', 'sh', 'exe', 'js', 'lnk']);
TrendMicroCAS
| where EventCategoryType in~ ('sharepoint', 'onedrive', 'dropbox', 'box', 'googledrive')
| where isnotempty(SrcFileName)
| extend file_type = extract(@'\.(\w+)$', 1, SrcFileName)
| where file_type in~ (f_types) or SrcFileName !contains @'.'
| extend AccountCustomEntity = DstUserName
requiredDataConnectors:
- connectorId: TrendMicroCAS
dataTypes:
- TrendMicroCAS
relevantTechniques:
- T1566
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/de54f817-f338-46bf-989b-4e016ea6b71b')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/de54f817-f338-46bf-989b-4e016ea6b71b')]",
"properties": {
"alertRuleTemplateName": "de54f817-f338-46bf-989b-4e016ea6b71b",
"customDetails": null,
"description": "'Detects unexpected files on file share.'\n",
"displayName": "Trend Micro CAS - Unexpected file on file share",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASUnexpectedFileOnFileShare.yaml",
"query": "let f_types = dynamic(['ps1', 'bat', 'scr', 'sh', 'exe', 'js', 'lnk']);\nTrendMicroCAS\n| where EventCategoryType in~ ('sharepoint', 'onedrive', 'dropbox', 'box', 'googledrive')\n| where isnotempty(SrcFileName)\n| extend file_type = extract(@'\\.(\\w+)$', 1, SrcFileName)\n| where file_type in~ (f_types) or SrcFileName !contains @'.'\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"
}
]
}