Microsoft Sentinel Analytic Rules
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PaloAlto - Possible flooding

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Idfeb185cc-51f4-11ec-bf63-0242ac130002
RulenamePaloAlto - Possible flooding
DescriptionDetects possible flooding.
SeverityMedium
TacticsInitialAccess
TechniquesT1190
T1133
Required data connectorsPaloAltoCDL
PaloAltoCDLAma
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLPossibleFlooding.yaml
Version1.0.2
Arm templatefeb185cc-51f4-11ec-bf63-0242ac130002.json
Deploy To Azure
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where isnotempty(NetworkSessionId)
| where DstBytes == 0 and tolong(NetworkPackets) > 0
| extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr
status: Available
id: feb185cc-51f4-11ec-bf63-0242ac130002
name: PaloAlto - Possible flooding
requiredDataConnectors:
- connectorId: PaloAltoCDL
  dataTypes:
  - PaloAltoCDLEvent
- connectorId: PaloAltoCDLAma
  dataTypes:
  - PaloAltoCDLEvent
severity: Medium
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLPossibleFlooding.yaml
kind: Scheduled
description: |
    'Detects possible flooding.'
relevantTechniques:
- T1190
- T1133
queryPeriod: 1h
triggerOperator: gt
queryFrequency: 1h
query: |
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where isnotempty(NetworkSessionId)
  | where DstBytes == 0 and tolong(NetworkPackets) > 0
  | extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr  
version: 1.0.2
tactics:
- InitialAccess
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/feb185cc-51f4-11ec-bf63-0242ac130002')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/feb185cc-51f4-11ec-bf63-0242ac130002')]",
      "properties": {
        "alertRuleTemplateName": "feb185cc-51f4-11ec-bf63-0242ac130002",
        "customDetails": null,
        "description": "'Detects possible flooding.'\n",
        "displayName": "PaloAlto - Possible flooding",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLPossibleFlooding.yaml",
        "query": "PaloAltoCDLEvent\n| where EventResourceId =~ 'TRAFFIC'\n| where isnotempty(NetworkSessionId)\n| where DstBytes == 0 and tolong(NetworkPackets) > 0\n| extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}