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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**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'

Rule type: Scheduled
Version: 1.0.3
Declared status: Available
Query frequency: 1h
Query period: 1h
Trigger: gt 0

Declared MITRE coverage

Declared sources

Metadata from the source file. No dependencies inferred from KQL.

Connectors

CefAma

Data types

CommonSecurityLog

KQL query

Original query, unchanged.

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

Declared entities

IPHost

Source provenance

GitHub

Displayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.

File: Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml ↗
Commit: 9800e51 ↗
Source identifier: b2f34315-9065-488e-88d0-a171d2b0da8e

Additional source files 2

Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yamlsource ↗Solutions/Infoblox Cloud Data Connector/Data/Solution_Infoblox.jsonsolution-membership ↗

GSTEP / CATALOG TRACKING

Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC

GSTEP sync dates, separate from the source content’s publication dates.