Ransomware Client Blocked

Back


Id	0c96a5a2-d60d-427d-8399-8df7fe8e6536
Rulename	Ransomware Client Blocked
Description	Identifies malicious clients blocked 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/RansomwareClientBlocked.yaml
Version	1.0.3
Arm template	0c96a5a2-d60d-427d-8399-8df7fe8e6536.json

KQL

Syslog
| project TimeGenerated, Computer, SyslogMessage
| where SyslogMessage has "The Filer has enforced the mitigation policy on volume"
| extend SrcIpAddr = substring(SyslogMessage, indexof(SyslogMessage, "(")+1, indexof(SyslogMessage, ")") - indexof(SyslogMessage,"(")-1)
| extend volume_name = substring(SyslogMessage, indexof(SyslogMessage, "volume")+7, indexof(SyslogMessage,"and") - (indexof(SyslogMessage, "volume")+7))
| sort by TimeGenerated desc

YAML

queryFrequency: 5m
customDetails:
  VolumeName: volume_name
alertDetailsOverride:
  alertnameFormat: 'Nasuni: Ransomware Client Blocked'
  alertDescriptionFormat: Nasuni has blocked a client involved in a ransomware attack from accessing a Nasuni Edge Appliance at {{TimeGenerated}}
tactics:
- Impact
name: Ransomware Client Blocked
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Nasuni/Analytic Rules/RansomwareClientBlocked.yaml
triggerThreshold: 0
description: Identifies malicious clients blocked by the Ransomware Protection service running on a Nasuni Edge Appliance.
status: Available
kind: Scheduled
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
id: 0c96a5a2-d60d-427d-8399-8df7fe8e6536
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: false
  createIncident: true
queryPeriod: 5m
version: 1.0.3
severity: High
relevantTechniques:
- T1486
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
suppressionEnabled: false
eventGroupingSettings:
  aggregationKind: AlertPerResult
triggerOperator: gt
suppressionDuration: 5h
query: |-
  Syslog
  | project TimeGenerated, Computer, SyslogMessage
  | where SyslogMessage has "The Filer has enforced the mitigation policy on volume"
  | extend SrcIpAddr = substring(SyslogMessage, indexof(SyslogMessage, "(")+1, indexof(SyslogMessage, ")") - indexof(SyslogMessage,"(")-1)
  | extend volume_name = substring(SyslogMessage, indexof(SyslogMessage, "volume")+7, indexof(SyslogMessage,"and") - (indexof(SyslogMessage, "volume")+7))
  | sort by TimeGenerated desc

ARM