Corelight - Forced External Outbound SMB

Corelight
| where EventType =~ 'conn'
| where ZeekConnLocalSrc == 'True'
| where ZeekConnLocalDst == 'False'
| where NetworkConnectionHistory hasprefix 'Sh' and NetworkApplication hasprefix 'smb'
| extend IPCustomEntity = SrcIpAddr

queryFrequency: 1h
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
severity: Medium
triggerThreshold: 0
relevantTechniques:
- T1187
query: |
  Corelight
  | where EventType =~ 'conn'
  | where ZeekConnLocalSrc == 'True'
  | where ZeekConnLocalDst == 'False'
  | where NetworkConnectionHistory hasprefix 'Sh' and NetworkApplication hasprefix 'smb'
  | extend IPCustomEntity = SrcIpAddr  
id: 73f23aa2-5cc4-4507-940b-75c9092e9e01
triggerOperator: gt
version: 1.0.0
requiredDataConnectors:
- connectorId: Corelight
  dataTypes:
  - Corelight
description: |
    'Detects SMB requests that originate internally and communicate with an external IP address.'
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightForcedExternalOutboundSMB.yaml
status: Available
name: Corelight - Forced External Outbound SMB
tactics:
- CredentialAccess
kind: Scheduled

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/73f23aa2-5cc4-4507-940b-75c9092e9e01')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/73f23aa2-5cc4-4507-940b-75c9092e9e01')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Corelight - Forced External Outbound SMB",
        "description": "'Detects SMB requests that originate internally and communicate with an external IP address.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "Corelight\n| where EventType =~ 'conn'\n| where ZeekConnLocalSrc == 'True'\n| where ZeekConnLocalDst == 'False'\n| where NetworkConnectionHistory hasprefix 'Sh' and NetworkApplication hasprefix 'smb'\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1187"
        ],
        "alertRuleTemplateName": "73f23aa2-5cc4-4507-940b-75c9092e9e01",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightForcedExternalOutboundSMB.yaml",
        "templateVersion": "1.0.0"
      }
    }
  ]
}