Infoblox - Many NXDOMAIN DNS Responses Detected

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Id	b2f34315-9065-488e-88d0-a171d2b0da8e
Rulename	Infoblox - Many NXDOMAIN DNS Responses Detected
Description	Detected at least 200 DNS responses for non-existent domains in 1 hour generated by single host. Queries do not need to be the same. Customize query count, scheduling, responses and more. This rule depends on a parser based on a Kusto Function to work as expected called InfobloxCDC.
Severity	Medium
Tactics	Impact
Techniques	T1498 T1565
Required data connectors	CefAma
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 Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml
Version	1.0.3
Arm template	b2f34315-9065-488e-88d0-a171d2b0da8e.json

KQL

let threshold = 200;
InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
| summarize count() by SourceIP
| where count_ > threshold
| join kind=inner (InfobloxCDC
  | where DeviceEventClassID == "DNS Response"
  | where InfobloxDNSRCode == "NXDOMAIN"
  ) on SourceIP

YAML

customDetails:
  SourceMACAddress: SourceMACAddress
description: |
    'Detected at least 200 DNS responses for non-existent domains in 1 hour generated by single host. Queries do not need to be the same. Customize query count, scheduling, responses and more. This rule depends on a parser based on a Kusto Function to work as expected called [**InfobloxCDC**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'
triggerThreshold: 0
eventGroupingSettings:
  aggregationKind: SingleAlert
queryPeriod: 1h
triggerOperator: gt
kind: Scheduled
relevantTechniques:
- T1498
- T1565
query: |
  let threshold = 200;
  InfobloxCDC
  | where DeviceEventClassID == "DNS Response"
  | where InfobloxDNSRCode == "NXDOMAIN"
  | summarize count() by SourceIP
  | where count_ > threshold
  | join kind=inner (InfobloxCDC
    | where DeviceEventClassID == "DNS Response"
    | where InfobloxDNSRCode == "NXDOMAIN"
    ) on SourceIP  
queryFrequency: 1h
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
name: Infoblox - Many NXDOMAIN DNS Responses Detected
severity: Medium
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIP
  entityType: IP
- fieldMappings:
  - identifier: HostName
    columnName: DeviceName
  - identifier: OSVersion
    columnName: InfobloxB1SrcOSVersion
  - identifier: FullName
    columnName: SourceUserName
  entityType: Host
version: 1.0.3
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml
status: Available
id: b2f34315-9065-488e-88d0-a171d2b0da8e
incidentConfiguration:
  createIncident: true
tactics:
- Impact

ARM