Ransomware Attack Detected

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Id	6c8770fb-c854-403e-a64d-0293ba344d5f
Rulename	Ransomware Attack Detected
Description	Identifies ransomware attacks detected by the Ransomware Protection service running on a Nasuni Edge Appliance.
Severity	High
Tactics	Impact
Techniques	T1486
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Nasuni/Analytic Rules/RansomwareAttackDetected.yaml
Version	1.0.3
Arm template	6c8770fb-c854-403e-a64d-0293ba344d5f.json

KQL

Syslog
| project TimeGenerated, Computer, SyslogMessage
| where SyslogMessage has "The Filer has detected a new ransomware attack"
| extend pattern = substring(SyslogMessage, indexof(SyslogMessage, "(")+1, indexof(SyslogMessage, ")") - indexof(SyslogMessage,"(")-1)
| extend volume_name = substring(SyslogMessage, indexof(SyslogMessage, "volume")+7, indexof(SyslogMessage,". Visit") - (indexof(SyslogMessage, "volume")+7))
| sort by TimeGenerated desc

YAML

status: Available
queryFrequency: 5m
suppressionEnabled: false
queryPeriod: 5m
triggerOperator: gt
alertDetailsOverride:
  alertDescriptionFormat: Ransomware attack detected by Nasuni at {{TimeGenerated}}.
  alertnameFormat: 'Nasuni: Ransomware Attack Detected'
  alertDynamicProperties:
  - alertProperty: RemediationSteps
    value: SyslogMessage
query: |-
  Syslog
  | project TimeGenerated, Computer, SyslogMessage
  | where SyslogMessage has "The Filer has detected a new ransomware attack"
  | extend pattern = substring(SyslogMessage, indexof(SyslogMessage, "(")+1, indexof(SyslogMessage, ")") - indexof(SyslogMessage,"(")-1)
  | extend volume_name = substring(SyslogMessage, indexof(SyslogMessage, "volume")+7, indexof(SyslogMessage,". Visit") - (indexof(SyslogMessage, "volume")+7))
  | sort by TimeGenerated desc  
eventGroupingSettings:
  aggregationKind: AlertPerResult
suppressionDuration: 5h
tactics:
- Impact
triggerThreshold: 0
entityMappings:
- entityType: Malware
  fieldMappings:
  - identifier: Name
    columnName: pattern
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
kind: Scheduled
relevantTechniques:
- T1486
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Nasuni/Analytic Rules/RansomwareAttackDetected.yaml
customDetails:
  VolumeName: volume_name
description: Identifies ransomware attacks detected by the Ransomware Protection service running on a Nasuni Edge Appliance.
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: PT5H
    enabled: false
  createIncident: true
name: Ransomware Attack Detected
version: 1.0.3
id: 6c8770fb-c854-403e-a64d-0293ba344d5f
severity: High

ARM