PaloAlto - Dropping or denying session with traffic

let threshold = 100;
PaloAltoCDLEvent
| where EventResourceId =~ 'TRAFFIC'
| where EventResult has_any ("deny", "drop", "reject") 
| where tolong(DstBytes) > 0
| where tolong(NetworkPackets) > 0
| summarize count() by SrcIpAddr, DstUsername, bin(TimeGenerated, 10m)
| where count_ > threshold
| extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr

query: |
  let threshold = 100;
  PaloAltoCDLEvent
  | where EventResourceId =~ 'TRAFFIC'
  | where EventResult has_any ("deny", "drop", "reject") 
  | where tolong(DstBytes) > 0
  | where tolong(NetworkPackets) > 0
  | summarize count() by SrcIpAddr, DstUsername, bin(TimeGenerated, 10m)
  | where count_ > threshold
  | extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr  
relevantTechniques:
- T1190
- T1133
name: PaloAlto - Dropping or denying session with traffic
severity: Medium
triggerThreshold: 0
description: |
    'Detects dropping or denying session with traffic.'
status: Available
triggerOperator: gt
tactics:
- InitialAccess
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
requiredDataConnectors:
- connectorId: PaloAltoCDL
  dataTypes:
  - PaloAltoCDLEvent
- connectorId: PaloAltoCDLAma
  dataTypes:
  - PaloAltoCDLEvent
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
id: ba663b74-51f4-11ec-bf63-0242ac130002
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAltoCDL/Analytic Rules/PaloAltoCDLDroppingSessionWithSentTraffic.yaml
queryPeriod: 1h
queryFrequency: 1h
version: 1.0.3
kind: Scheduled

{
  "$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/ba663b74-51f4-11ec-bf63-0242ac130002')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ba663b74-51f4-11ec-bf63-0242ac130002')]",
      "properties": {
        "alertRuleTemplateName": "ba663b74-51f4-11ec-bf63-0242ac130002",
        "customDetails": null,
        "description": "'Detects dropping or denying session with traffic.'\n",
        "displayName": "PaloAlto - Dropping or denying session with traffic",
        "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/PaloAltoCDLDroppingSessionWithSentTraffic.yaml",
        "query": "let threshold = 100;\nPaloAltoCDLEvent\n| where EventResourceId =~ 'TRAFFIC'\n| where EventResult has_any (\"deny\", \"drop\", \"reject\") \n| where tolong(DstBytes) > 0\n| where tolong(NetworkPackets) > 0\n| summarize count() by SrcIpAddr, DstUsername, bin(TimeGenerated, 10m)\n| where count_ > threshold\n| extend AccountCustomEntity = DstUsername, IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}