Lumen TI IPAddress in CommonSecurityLog

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

This query maps Lumen IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in CommonSecurityLog.

MITRE ATT&CK coverage

Tactic	Techniques
Command & Control	`T1071` Application Layer Protocol

Rule body kusto

id: bc8a262a-5db3-4ac1-8757-519ed36ed929
name: Lumen TI IPAddress in CommonSecurityLog
displayName: Lumen TI IPAddress in CommonSecurityLog
description: |
  This query maps Lumen IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in CommonSecurityLog.
severity: Medium
requiredDataConnectors:
  - connectorId: LumenThreatFeedConnector
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceUploadIndicatorsAPI
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: CEF
    dataTypes:
      - CommonSecurityLog
  - connectorId: CefAma
    dataTypes:
      - CommonSecurityLog
queryFrequency: 4h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
suppressionDuration: 5h
suppressionEnabled: true
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let IPRegex = '[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}';
  let dt_lookBack = 1h; // Look back 1 hour for CommonSecurityLog events
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  // Fetch threat intelligence indicators related to IP addresses
  let IP_Indicators = ThreatIntelIndicators
   | where TimeGenerated >= ago(ioc_lookBack)
   | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
   | where IsActive == true and ValidUntil > now()
   | where SourceSystem == 'Lumen'
   | where ObservableKey == "ipv4-addr:value"
   | extend TI_ipEntity = ObservableValue
   | where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127.";
  // Perform a join between IP indicators and CommonSecurityLog events
  IP_Indicators
   | join kind=innerunique (
       CommonSecurityLog
       | where TimeGenerated >= ago(dt_lookBack)
       | extend MessageIP = extract(IPRegex, 0, Message)
       | extend CS_ipEntity = iff(isnotempty(SourceIP), SourceIP, DestinationIP)
       | extend CS_ipEntity = iff(isempty(CS_ipEntity) and isnotempty(MessageIP), MessageIP, CS_ipEntity)
       | extend CommonSecurityLog_TimeGenerated = TimeGenerated
   )
   on $left.TI_ipEntity == $right.CS_ipEntity
   | where CommonSecurityLog_TimeGenerated < ValidUntil
   | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by Id, CS_ipEntity
   | project timestamp = CommonSecurityLog_TimeGenerated, SourceIP, DestinationIP, MessageIP, Message, DeviceVendor, DeviceProduct, Id, Tags, ValidUntil, Confidence, TI_ipEntity, CS_ipEntity, LogSeverity, DeviceAction, Type
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: CS_ipEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Parameters

let IPRegex = '[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}';
let dt_lookBack = 1h;
let ioc_lookBack = 14d;

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

Stage 1: `source`

ThreatIntelIndicators

Stage 2: `where`

| where TimeGenerated >= ago(ioc_lookBack)

Stage 3: `summarize`

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

Stage 4: `where`

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

Stage 5: `where`

| where SourceSystem == 'Lumen'

Stage 6: `where`

| where ObservableKey == "ipv4-addr:value"

Stage 7: `extend`

| extend TI_ipEntity = ObservableValue

Stage 8: `where`

| where ipv4_is_private(TI_ipEntity) == false and TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."

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

Stage 9: `join`

IP_Indicators
| join kind=innerunique (
     CommonSecurityLog
     | where TimeGenerated >= ago(dt_lookBack)
     | extend MessageIP = extract(IPRegex, 0, Message)
     | extend CS_ipEntity = iff(isnotempty(SourceIP), SourceIP, DestinationIP)
     | extend CS_ipEntity = iff(isempty(CS_ipEntity) and isnotempty(MessageIP), MessageIP, CS_ipEntity)
     | extend CommonSecurityLog_TimeGenerated = TimeGenerated
 )
 on $left.TI_ipEntity == $right.CS_ipEntity

Stage 10: `where`

| where CommonSecurityLog_TimeGenerated < ValidUntil

Stage 11: `summarize`

| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by Id, CS_ipEntity

Stage 12: `project`

| project timestamp = CommonSecurityLog_TimeGenerated, SourceIP, DestinationIP, MessageIP, Message, DeviceVendor, DeviceProduct, Id, Tags, ValidUntil, Confidence, TI_ipEntity, CS_ipEntity, LogSeverity, DeviceAction, Type

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`TI_ipEntity`	cidr_match	`10.0.0.0/8`, `172.16.0.0/12`, `192.168.0.0/16`, `169.254.0.0/16`, `127.0.0.0/8`
`TI_ipEntity`	starts_with	`127.`
`TI_ipEntity`	starts_with	`::`
`TI_ipEntity`	starts_with	`fe80`

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
`CommonSecurityLog_TimeGenerated`	lt	`ValidUntil` transforms: `cased`
`IsActive`	eq	`true` transforms: `cased`
`ObservableKey`	eq	`ipv4-addr:value` transforms: `cased`
`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
`CS_ipEntity`	`project`
`Confidence`	`project`
`DestinationIP`	`project`
`DeviceAction`	`project`
`DeviceProduct`	`project`
`DeviceVendor`	`project`
`Id`	`project`
`LogSeverity`	`project`
`Message`	`project`
`MessageIP`	`project`
`SourceIP`	`project`
`TI_ipEntity`	`project`
`Tags`	`project`
`Type`	`project`
`ValidUntil`	`project`
`timestamp`	`project`

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`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 IPAddress in CommonSecurityLog

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Stage 1: `source`

Stage 2: `where`

Stage 3: `summarize`

Stage 4: `where`

Stage 5: `where`

Stage 6: `where`

Stage 7: `extend`

Stage 8: `where`

Stage 9: `join`

Stage 10: `where`

Stage 11: `summarize`

Stage 12: `project`

Exclusions

Indicators

Output fields

Keyboard shortcuts

Search operators

Lumen TI IPAddress in CommonSecurityLog

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: summarize

Stage 4: where

Stage 5: where

Stage 6: where

Stage 7: extend

Stage 8: where

Stage 9: join

Stage 10: where

Stage 11: summarize

Stage 12: project

Exclusions

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `summarize`

Stage 4: `where`

Stage 5: `where`

Stage 6: `where`

Stage 7: `extend`

Stage 8: `where`

Stage 9: `join`

Stage 10: `where`

Stage 11: `summarize`

Stage 12: `project`