Ransomware Client Blocked

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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	NasuniEdgeAppliance 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	1.0.2
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

relevantTechniques:
- T1486
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: PT5H
    enabled: false
    reopenClosedIncident: false
    matchingMethod: AllEntities
name: Ransomware Client Blocked
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: NasuniEdgeAppliance
- datatypes:
  - Syslog
  connectorId: SyslogAma
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
  entityType: IP
triggerThreshold: 0
id: 0c96a5a2-d60d-427d-8399-8df7fe8e6536
tactics:
- Impact
version: 1.0.2
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}}
queryPeriod: 5m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Nasuni/Analytic Rules/RansomwareClientBlocked.yaml
suppressionDuration: 5h
queryFrequency: 5m
severity: High
status: Available
suppressionEnabled: false
description: Identifies malicious clients blocked by the Ransomware Protection service running on a Nasuni Edge Appliance.
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  
triggerOperator: gt

ARM

{
  "$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/0c96a5a2-d60d-427d-8399-8df7fe8e6536')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0c96a5a2-d60d-427d-8399-8df7fe8e6536')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Nasuni has blocked a client involved in a ransomware attack from accessing a Nasuni Edge Appliance at {{TimeGenerated}}",
          "alertnameFormat": "Nasuni: Ransomware Client Blocked"
        },
        "alertRuleTemplateName": "0c96a5a2-d60d-427d-8399-8df7fe8e6536",
        "customDetails": {
          "VolumeName": "volume_name"
        },
        "description": "Identifies malicious clients blocked by the Ransomware Protection service running on a Nasuni Edge Appliance.",
        "displayName": "Ransomware Client Blocked",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SrcIpAddr",
                "identifier": "Address"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Nasuni/Analytic Rules/RansomwareClientBlocked.yaml",
        "query": "Syslog\n| project TimeGenerated, Computer, SyslogMessage\n| where SyslogMessage has \"The Filer has enforced the mitigation policy on volume\"\n| extend SrcIpAddr = substring(SyslogMessage, indexof(SyslogMessage, \"(\")+1, indexof(SyslogMessage, \")\") - indexof(SyslogMessage,\"(\")-1)\n| extend volume_name = substring(SyslogMessage, indexof(SyslogMessage, \"volume\")+7, indexof(SyslogMessage,\"and\") - (indexof(SyslogMessage, \"volume\")+7))\n| sort by TimeGenerated desc",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1486"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}