Microsoft Sentinel Analytic Rules
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Antivirus Detected an Infected File

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Id4f767afa-d666-4ed4-b453-a4f5ad35181b
RulenameAntivirus Detected an Infected File
DescriptionMonitors CTERA platform to detect files infected with viruses identified by the antivirus engine on Edge Filers.
SeverityHigh
TacticsImpact
TechniquesT1203
Required data connectorsCTERA
KindNRT
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTERA/Analytic Rules/InfectedFileDetected.yaml
Version1.0.0
Arm template4f767afa-d666-4ed4-b453-a4f5ad35181b.json
Deploy To Azure
Syslog
| where SyslogMessage contains "found an infected file"
| extend 
    EdgeFiler = extract("Edge filer (\\w+)", 1, SyslogMessage),
    DetectionTime = extract("found an infected file at ([^ ]+)", 1, SyslogMessage),
    Portal = extract("from portal: (\\w+)", 1, SyslogMessage),
    FilePath = extract("The file path is: ([^\\.]+)", 1, SyslogMessage),
    Virus = extract("The virus is: ([^\\.]+)", 1, SyslogMessage)
| project TimeGenerated, EdgeFiler, DetectionTime, Portal, FilePath, Virus
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTERA/Analytic Rules/InfectedFileDetected.yaml
kind: NRT
tactics:
- Impact
id: 4f767afa-d666-4ed4-b453-a4f5ad35181b
eventGroupingSettings:
  aggregationKind: SingleAlert
name: Antivirus Detected an Infected File
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: EdgeFiler
query: |
  Syslog
  | where SyslogMessage contains "found an infected file"
  | extend 
      EdgeFiler = extract("Edge filer (\\w+)", 1, SyslogMessage),
      DetectionTime = extract("found an infected file at ([^ ]+)", 1, SyslogMessage),
      Portal = extract("from portal: (\\w+)", 1, SyslogMessage),
      FilePath = extract("The file path is: ([^\\.]+)", 1, SyslogMessage),
      Virus = extract("The virus is: ([^\\.]+)", 1, SyslogMessage)
  | project TimeGenerated, EdgeFiler, DetectionTime, Portal, FilePath, Virus  
description: Monitors CTERA platform to detect files infected with viruses identified by the antivirus engine on Edge Filers.
severity: High
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: CTERA
suppressionEnabled: false
version: 1.0.0
status: Available
suppressionDuration: PT5H
relevantTechniques:
- T1203
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: PT5H
    matchingMethod: AllEntities
    enabled: false
customDetails:
  Virus: Virus
  EdgeFiler: EdgeFiler
  Portal: Portal
  FilePath: FilePath
alertDetailsOverride:
  alertnameFormat: Antivirus Detected an Infected File
  alertDescriptionFormat: Antivirus detected an infected file on {{EdgeFiler}} at {{DetectionTime}}.
{
  "$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/4f767afa-d666-4ed4-b453-a4f5ad35181b')]",
      "kind": "NRT",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4f767afa-d666-4ed4-b453-a4f5ad35181b')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Antivirus detected an infected file on {{EdgeFiler}} at {{DetectionTime}}.",
          "alertnameFormat": "Antivirus Detected an Infected File"
        },
        "alertRuleTemplateName": "4f767afa-d666-4ed4-b453-a4f5ad35181b",
        "customDetails": {
          "EdgeFiler": "EdgeFiler",
          "FilePath": "FilePath",
          "Portal": "Portal",
          "Virus": "Virus"
        },
        "description": "Monitors CTERA platform to detect files infected with viruses identified by the antivirus engine on Edge Filers.",
        "displayName": "Antivirus Detected an Infected File",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "EdgeFiler",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTERA/Analytic Rules/InfectedFileDetected.yaml",
        "query": "Syslog\n| where SyslogMessage contains \"found an infected file\"\n| extend \n    EdgeFiler = extract(\"Edge filer (\\\\w+)\", 1, SyslogMessage),\n    DetectionTime = extract(\"found an infected file at ([^ ]+)\", 1, SyslogMessage),\n    Portal = extract(\"from portal: (\\\\w+)\", 1, SyslogMessage),\n    FilePath = extract(\"The file path is: ([^\\\\.]+)\", 1, SyslogMessage),\n    Virus = extract(\"The virus is: ([^\\\\.]+)\", 1, SyslogMessage)\n| project TimeGenerated, EdgeFiler, DetectionTime, Portal, FilePath, Virus\n",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1203"
        ],
        "templateVersion": "1.0.0"
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}