Potential DHCP Starvation Attack

let threshold = 1000;
Infoblox
| where ProcessName =~ "dhcpd" and Log_Type =~ "DHCPREQUEST"
| summarize count() by SrcIpAddr, bin(TimeGenerated,5m)
| where count_ > threshold
| join kind=inner (Infoblox
    | where ProcessName =~ "dhcpd" and Log_Type =~ "DHCPREQUEST"
    ) on SrcIpAddr

relevantTechniques:
- T1200
name: Potential DHCP Starvation Attack
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: InfobloxNIOS
- datatypes:
  - Syslog
  connectorId: SyslogAma
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
  entityType: IP
triggerThreshold: 0
id: 57e56fc9-417a-4f41-a579-5475aea7b8ce
tactics:
- InitialAccess
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox NIOS/Analytic Rules/PotentialDHCPStarvationAttack.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'This creates an incident in the event that an excessive amount of DHCPREQUEST have been recieved by a DHCP Server and could potentially be an indication of a DHCP Starvation Attack.'
query: |
  let threshold = 1000;
  Infoblox
  | where ProcessName =~ "dhcpd" and Log_Type =~ "DHCPREQUEST"
  | summarize count() by SrcIpAddr, bin(TimeGenerated,5m)
  | where count_ > threshold
  | join kind=inner (Infoblox
      | where ProcessName =~ "dhcpd" and Log_Type =~ "DHCPREQUEST"
      ) on SrcIpAddr  
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/57e56fc9-417a-4f41-a579-5475aea7b8ce')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/57e56fc9-417a-4f41-a579-5475aea7b8ce')]",
      "properties": {
        "alertRuleTemplateName": "57e56fc9-417a-4f41-a579-5475aea7b8ce",
        "customDetails": null,
        "description": "'This creates an incident in the event that an excessive amount of DHCPREQUEST have been recieved by a DHCP Server and could potentially be an indication of a DHCP Starvation Attack.'\n",
        "displayName": "Potential DHCP Starvation Attack",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SrcIpAddr",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox NIOS/Analytic Rules/PotentialDHCPStarvationAttack.yaml",
        "query": "let threshold = 1000;\nInfoblox\n| where ProcessName =~ \"dhcpd\" and Log_Type =~ \"DHCPREQUEST\"\n| summarize count() by SrcIpAddr, bin(TimeGenerated,5m)\n| where count_ > threshold\n| join kind=inner (Infoblox\n    | where ProcessName =~ \"dhcpd\" and Log_Type =~ \"DHCPREQUEST\"\n    ) on SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1200"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}