Lumen TI domain in DnsEvents

Severity: medium
Time window: 14d
Group by: DNS_domainEntity, Id, TI_domainEntity
Source: github.com/Azure/Azure-Sentinel

This query searches for matches between Lumen threat intelligence domain indicators and DnsEvents.

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1071` Application Layer Protocol

Rule body kusto

id: 29bf5bcd-6795-4c79-a91f-aaef5a618bab
name: Lumen TI domain in DnsEvents
displayName: Lumen TI domain in DnsEvents
description: |
  This query searches for matches between Lumen threat intelligence domain indicators and DnsEvents.
severity: Medium
requiredDataConnectors:
  - connectorId: LumenThreatFeedConnector
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceUploadIndicatorsAPI
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: DNS
    dataTypes:
      - DnsEvents
queryFrequency: 4h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
suppressionDuration: 5h
suppressionEnabled: true
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let dt_lookBack = 1d; // Data lookback for DnsEvents
  let ioc_lookBack = 14d; // TI lookback
  // Latest, active, non-expired Lumen domain indicators
  let Domain_Indicators = ThreatIntelIndicators
    | where TimeGenerated >= ago(ioc_lookBack)
    | where IsActive == true and ValidUntil > now()
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
    | where SourceSystem == 'Lumen'
    | where ObservableKey == 'domain-name:value' or ObservableValue contains '.'
    | extend TI_domainEntity = tostring(ObservableValue);
  Domain_Indicators
  | join kind=innerunique (
      DnsEvents
      | where TimeGenerated >= ago(dt_lookBack)
      | extend DNS_domainEntity = Name
      | extend DnsEvents_TimeGenerated = TimeGenerated
    ) on $left.TI_domainEntity == $right.DNS_domainEntity
  | where DnsEvents_TimeGenerated < ValidUntil
  | summarize arg_max(DnsEvents_TimeGenerated, *), StartTime = min(DnsEvents_TimeGenerated), EndTime = max(DnsEvents_TimeGenerated) by Id, DNS_domainEntity
  | project timestamp = EndTime, StartTime, EndTime, Name, QueryType, Computer, Id, Tags, ValidUntil, Confidence, TI_domainEntity, DNS_domainEntity, Type
entityMappings:
  - entityType: DNS
    fieldMappings:
      - identifier: DomainName
        columnName: DNS_domainEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Parameters

let dt_lookBack = 1d;
let ioc_lookBack = 14d;

The stages below define let Domain_Indicators (the rule's main pipeline source).

Stage 1: `source`

ThreatIntelIndicators

Stage 2: `where`

| where TimeGenerated >= ago(ioc_lookBack)

Stage 3: `where`

| where IsActive == true and ValidUntil > now()

Stage 4: `summarize`

| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id

Stage 5: `where`

| where SourceSystem == 'Lumen'

Stage 6: `where`

| where ObservableKey == 'domain-name:value' or ObservableValue contains '.'

Stage 7: `extend`

| extend TI_domainEntity = tostring(ObservableValue)

The stages below run on Domain_Indicators (the outer pipeline).

Stage 8: `join`

Domain_Indicators
| join kind=innerunique (
    DnsEvents
    | where TimeGenerated >= ago(dt_lookBack)
    | extend DNS_domainEntity = Name
    | extend DnsEvents_TimeGenerated = TimeGenerated
  ) on $left.TI_domainEntity == $right.DNS_domainEntity

Stage 9: `where`

| where DnsEvents_TimeGenerated < ValidUntil

Stage 10: `summarize`

| summarize arg_max(DnsEvents_TimeGenerated, *), StartTime = min(DnsEvents_TimeGenerated), EndTime = max(DnsEvents_TimeGenerated) by Id, DNS_domainEntity

Stage 11: `project`

| project timestamp = EndTime, StartTime, EndTime, Name, QueryType, Computer, Id, Tags, ValidUntil, Confidence, TI_domainEntity, DNS_domainEntity, Type

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.

Field	Kind	Values
`DnsEvents_TimeGenerated`	lt	`ValidUntil` transforms: `cased`
`IsActive`	eq	`true` transforms: `cased`
`ObservableKey`	eq	`domain-name:value` transforms: `cased`
`ObservableValue`	contains	`.`
`SourceSystem`	eq	`Lumen` transforms: `cased`

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.

Field	Source
`Computer`	`project`
`Confidence`	`project`
`DNS_domainEntity`	`project`
`EndTime`	`project`
`Id`	`project`
`Name`	`project`
`QueryType`	`project`
`StartTime`	`project`
`TI_domainEntity`	`project`
`Tags`	`project`
`Type`	`project`
`ValidUntil`	`project`
`timestamp`	`project`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Lumen TI domain in DnsEvents

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `summarize`

Stage 5: `where`

Stage 6: `where`

Stage 7: `extend`

Stage 8: `join`

Stage 9: `where`

Stage 10: `summarize`

Stage 11: `project`

Indicators

Output fields

Keyboard shortcuts

Search operators

Lumen TI domain in DnsEvents

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: summarize

Stage 5: where

Stage 6: where

Stage 7: extend

Stage 8: join

Stage 9: where

Stage 10: summarize

Stage 11: project

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `summarize`

Stage 5: `where`

Stage 6: `where`

Stage 7: `extend`

Stage 8: `join`

Stage 9: `where`

Stage 10: `summarize`

Stage 11: `project`