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Detection rules › Kusto

Google Threat Intelligence - Threat Hunting IP

Severity
medium
Time window
1d
Group by
DstIpAddr, Id, ObservableValue
Source
github.com/Azure/Azure-Sentinel

Google Threat Intelligence IP correlation.

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1071 Application Layer Protocol

Event coverage

ProviderEventTitle
SysmonEvent ID 3Network connection
Security-AuditingEvent ID 5152The Windows Filtering Platform blocked a packet.
Security-AuditingEvent ID 5154The Windows Filtering Platform has permitted an application or service to listen on a port for incoming connections.
Security-AuditingEvent ID 5155The Windows Filtering Platform has blocked an application or service from listening on a port for incoming connections.
Security-AuditingEvent ID 5156The Windows Filtering Platform has permitted a connection.
Security-AuditingEvent ID 5157The Windows Filtering Platform has blocked a connection.
Security-AuditingEvent ID 5158The Windows Filtering Platform has permitted a bind to a local port.
Security-AuditingEvent ID 5159The Windows Filtering Platform has blocked a bind to a local port.

Rule body kusto

id: "7edb2abb-7ef7-4685-92eb-a628703ccf9f"
name: Google Threat Intelligence - Threat Hunting IP
description: |
  'Google Threat Intelligence IP correlation.'
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelIndicators
queryFrequency: 30m
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1h
    matchingMethod: AllEntities
eventGroupingSettings:
  aggregationKind: AlertPerResult
alertDetailsOverride:
  alertDisplayNameFormat: 'Google Threat Intelligence Match'
  alertDescriptionFormat: 'Correlation found from the {{Type}} table.'
query: |
  let ioc_lookBack = 1d;
  _Im_NetworkSession
  | where isnotempty(DstIpAddr)
  | join kind=inner (
  ThreatIntelIndicators
  | where ObservableKey == 'ipv4-addr:value'
  | where isnotempty(ObservableValue)
  | where SourceSystem == "Google Threat Intelligence"
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
  | where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
  ) on $left.DstIpAddr == $right.ObservableValue
  | project NetworkIP=ObservableValue, Description=Data.description, Type, TimeGenerated
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: NetworkIP
version: 1.0.0
kind: Scheduled

Stages and Predicates

Parameters

let ioc_lookBack = 1d;

Stage 1: source

_Im_NetworkSession

Stage 2: where

| where isnotempty(DstIpAddr)

Stage 3: join

| join kind=inner (
ThreatIntelIndicators
| where ObservableKey == 'ipv4-addr:value'
| where isnotempty(ObservableValue)
| where SourceSystem == "Google Threat Intelligence"
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
| where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
) on $left.DstIpAddr == $right.ObservableValue

Stage 4: project

| project NetworkIP=ObservableValue, Description=Data.description, Type, TimeGenerated

Stage 5: summarize

summarize by Id

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
DstIpAddris_not_null
  • (no value, null check)
IsActiveeq
  • true transforms: cased corpus 17 (kusto 17)
ObservableKeyeq
  • ipv4-addr:value transforms: cased corpus 9 (kusto 9)
ObservableValueis_not_null
  • (no value, null check)
SourceSystemeq
  • Google Threat Intelligence transforms: cased corpus 4 (kusto 4)
ValidUntilis_null
  • (no value, null check)

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

FieldSource
Idsummarize