Potential DHCP Starvation Attack

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Id	57e56fc9-417a-4f41-a579-5475aea7b8ce
Rulename	Potential DHCP Starvation Attack
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.
Severity	Medium
Tactics	InitialAccess
Techniques	T1200
Required data connectors	SyslogAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox NIOS/Analytic Rules/PotentialDHCPStarvationAttack.yaml
Version	1.0.5
Arm template	57e56fc9-417a-4f41-a579-5475aea7b8ce.json

KQL

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

YAML

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  
triggerThreshold: 0
status: Available
version: 1.0.5
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
relevantTechniques:
- T1200
queryFrequency: 1h
triggerOperator: gt
kind: Scheduled
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
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.'
severity: Medium
tactics:
- InitialAccess
name: Potential DHCP Starvation Attack
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox NIOS/Analytic Rules/PotentialDHCPStarvationAttack.yaml
id: 57e56fc9-417a-4f41-a579-5475aea7b8ce
queryPeriod: 1h

ARM