Detection rules › Kusto
Trend Micro CAS - Ransomware outbreak
'Triggeres when ransomware was detected on several accounts.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Impact |
Rule body
id: 38e043ce-a1fd-497b-8d4f-ce5ca2db90cd
name: Trend Micro CAS - Ransomware outbreak
description: |
'Triggeres when ransomware was detected on several accounts.'
severity: High
status: Available
requiredDataConnectors:
- connectorId: TrendMicroCAS
dataTypes:
- TrendMicroCAS
queryFrequency: 10m
queryPeriod: 10m
triggerOperator: gt
triggerThreshold: 0
tactics:
- Impact
relevantTechniques:
- T1486
query: |
TrendMicroCAS
| where EventType =~ 'ransomware'
| summarize count() by DstUserName, bin(TimeGenerated, 2m)
| where count_ >= 2
| extend AccountCustomEntity = DstUserName
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
version: 1.0.1
kind: Scheduled
Stages and Predicates
Stage 1: source
TrendMicroCAS
Stage 2: where
| where EventType =~ 'ransomware'
Stage 3: summarize
| summarize count() by DstUserName, bin(TimeGenerated, 2m)
Stage 4: where
| where count_ >= 2
Stage 5: extend
| extend AccountCustomEntity = DstUserName
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventType | eq |
| field:"EventType" kind:eq value:"ransomware" |
count_ | ge |
| field:"count_" kind:ge value:"2" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
DstUserName | summarize |
AccountCustomEntity | extend |