Corelight - Forced External Outbound SMB

union corelight_conn, corelight_conn_red
| where local_orig == true
| where local_resp == false
| where history hasprefix 'Sh' and service hasprefix 'smb'

relevantTechniques:
- T1187
name: Corelight - Forced External Outbound SMB
requiredDataConnectors:
- dataTypes:
  - Corelight_v2_conn
  - Corelight_v2_conn_red
  - corelight_conn
  - corelight_conn_red
  connectorId: Corelight
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: id_orig_h
  entityType: IP
triggerThreshold: 0
id: 73f23aa2-5cc4-4507-940b-75c9092e9e01
tactics:
- CredentialAccess
version: 2.1.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightForcedExternalOutboundSMB.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'Detects SMB requests that originate internally and communicate with an external IP address.'
query: |
  union corelight_conn, corelight_conn_red
  | where local_orig == true
  | where local_resp == false
  | where history hasprefix 'Sh' and service hasprefix 'smb'  
triggerOperator: gt

{
  "$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/73f23aa2-5cc4-4507-940b-75c9092e9e01')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/73f23aa2-5cc4-4507-940b-75c9092e9e01')]",
      "properties": {
        "alertRuleTemplateName": "73f23aa2-5cc4-4507-940b-75c9092e9e01",
        "customDetails": null,
        "description": "'Detects SMB requests that originate internally and communicate with an external IP address.'\n",
        "displayName": "Corelight - Forced External Outbound SMB",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "id_orig_h",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Corelight/Analytic Rules/CorelightForcedExternalOutboundSMB.yaml",
        "query": "union corelight_conn, corelight_conn_red\n| where local_orig == true\n| where local_resp == false\n| where history hasprefix 'Sh' and service hasprefix 'smb'\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1187"
        ],
        "templateVersion": "2.1.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}