Trend Micro CAS - Ransomware outbreak

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Id	38e043ce-a1fd-497b-8d4f-ce5ca2db90cd
Rulename	Trend Micro CAS - Ransomware outbreak
Description	Triggeres when ransomware was detected on several accounts.
Severity	High
Tactics	Impact
Techniques	T1486
Required data connectors	TrendMicroCAS
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASRansomwareOutbreak.yaml
Version	1.0.1
Arm template	38e043ce-a1fd-497b-8d4f-ce5ca2db90cd.json

KQL

TrendMicroCAS
| where EventType =~ 'ransomware'
| summarize count() by DstUserName, bin(TimeGenerated, 2m)
| where count_ >= 2
| extend AccountCustomEntity = DstUserName

YAML

name: Trend Micro CAS - Ransomware outbreak
relevantTechniques:
- T1486
id: 38e043ce-a1fd-497b-8d4f-ce5ca2db90cd
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASRansomwareOutbreak.yaml
requiredDataConnectors:
- dataTypes:
  - TrendMicroCAS
  connectorId: TrendMicroCAS
version: 1.0.1
severity: High
triggerThreshold: 0
queryPeriod: 10m
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
queryFrequency: 10m
status: Available
query: |
  TrendMicroCAS
  | where EventType =~ 'ransomware'
  | summarize count() by DstUserName, bin(TimeGenerated, 2m)
  | where count_ >= 2
  | extend AccountCustomEntity = DstUserName  
tactics:
- Impact
kind: Scheduled
description: |
    'Triggeres when ransomware was detected on several accounts.'
triggerOperator: gt

ARM