Illusive Incidents Analytic Rule

Status: available
Severity: medium
Time window: 5m
Group by: AdditionalExtensions, DeviceCustomNumber2, TimeGenerated
Source: github.com/Azure/Azure-Sentinel

'Create a Microsoft Sentinel incident upon a new Illusive alert (incident) and associate all related Illusive events to the relevant Microsoft Sentinel alert. This is done by filtering and processing Illusive Syslog messages.'

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1078` Valid Accounts, `T1098` Account Manipulation
Privilege Escalation	`T1078` Valid Accounts, `T1098` Account Manipulation, `T1548` Abuse Elevation Control Mechanism
Stealth	`T1078` Valid Accounts
Lateral Movement	`T1021` Remote Services

Rule body kusto

id: 1a7dbcf6-21a2-4255-84b2-c8dbbdca4630
name: Illusive Incidents Analytic Rule
description: |
  'Create a Microsoft Sentinel incident upon a new Illusive alert (incident) and associate all related Illusive events to the relevant Microsoft Sentinel alert. This is done by filtering and processing Illusive Syslog messages.'
severity: Medium
status: Available
requiredDataConnectors: 
  - connectorId: Illusive
    dataTypes:
      - CommonSecurityLog
  - connectorId: illusiveAttackManagementSystemAma
    dataTypes:
      - CommonSecurityLog
  - connectorId: CefAma
    dataTypes:
      - CommonSecurityLog
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Persistence
  - PrivilegeEscalation
  - DefenseEvasion
  - CredentialAccess
  - LateralMovement
relevantTechniques:
  - T1078
  - T1098
  - T1548
  - T1021
query: |
  CommonSecurityLog
  | where DeviceProduct == "illusive"
  | extend DeviceCustomNumber2 = coalesce(column_ifexists("FieldDeviceCustomNumber2", long(null)),DeviceCustomNumber2)
  | summarize arg_max(TimeGenerated, *) by DeviceCustomNumber2, AdditionalExtensions, TimeGenerated
  | extend Category = extract(@'cat=([^;]+)(\;|$)', 1, AdditionalExtensions), HasForensics = extract(@'cs7=([^;]+)(\;|$)', 1, AdditionalExtensions)
  | extend Category = coalesce(column_ifexists("DeviceEventCategory",""),Category)	
  | where Category == "illusive:alerts"
  | extend IncidentId = DeviceCustomNumber2, IncidentURL = DeviceCustomString5
  | project TimeGenerated, SourceIP, SourceHostName,Computer , DeviceEventClassID ,HasForensics ,SourceUserName, Activity, DeviceAddress,  DestinationHostName, DestinationUserName, IncidentId, IncidentURL
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SourceIP
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: SourceHostName
  - entityType: Host
    fieldMappings:
      - identifier: OMSAgentID
        columnName: Computer
customDetails:
  IllusiveIncidentId: IncidentId
  HasForensics: HasForensics
  Account: SourceUserName
eventGroupingSettings:
  aggregationKind: AlertPerResult
alertDetailsOverride:
  alertDisplayNameFormat: | 
    Illusive Incident: {{IncidentId}}
  alertDescriptionFormat: | 
    Illusive Incident {{IncidentId}} generated at {{TimeGenerated}}
version: 1.0.5
kind: Scheduled

Stages and Predicates

Stage 1: `source`

CommonSecurityLog

Stage 2: `where`

| where DeviceProduct == "illusive"

Stage 3: `extend`

| extend DeviceCustomNumber2 = coalesce(column_ifexists("FieldDeviceCustomNumber2", long(null)),DeviceCustomNumber2)

Stage 4: `summarize`

| summarize arg_max(TimeGenerated, *) by DeviceCustomNumber2, AdditionalExtensions, TimeGenerated

Stage 5: `extend`

| extend Category = extract(@'cat=([^;]+)(\;|$)', 1, AdditionalExtensions), HasForensics = extract(@'cs7=([^;]+)(\;|$)', 1, AdditionalExtensions)

Stage 6: `extend`

| extend Category = coalesce(column_ifexists("DeviceEventCategory",""),Category)

Stage 7: `where`

| where Category == "illusive:alerts"

Stage 8: `extend`

| extend IncidentId = DeviceCustomNumber2, IncidentURL = DeviceCustomString5

Stage 9: `project`

| project TimeGenerated, SourceIP, SourceHostName,Computer , DeviceEventClassID ,HasForensics ,SourceUserName, Activity, DeviceAddress,  DestinationHostName, DestinationUserName, IncidentId, IncidentURL

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
`Category`	eq	`illusive:alerts` transforms: `cased`
`DeviceProduct`	eq	`illusive` 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
`Activity`	`project`
`Computer`	`project`
`DestinationHostName`	`project`
`DestinationUserName`	`project`
`DeviceAddress`	`project`
`DeviceEventClassID`	`project`
`HasForensics`	`project`
`IncidentId`	`project`
`IncidentURL`	`project`
`SourceHostName`	`project`
`SourceIP`	`project`
`SourceUserName`	`project`
`TimeGenerated`	`project`

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`f`	Follow link (`Shift` = new tab)
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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)

Illusive Incidents Analytic Rule

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `summarize`

Stage 5: `extend`

Stage 6: `extend`

Stage 7: `where`

Stage 8: `extend`

Stage 9: `project`

Indicators

Output fields

Keyboard shortcuts

Search operators

Illusive Incidents Analytic Rule

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: summarize

Stage 5: extend

Stage 6: extend

Stage 7: where

Stage 8: extend

Stage 9: project

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `summarize`

Stage 5: `extend`

Stage 6: `extend`

Stage 7: `where`

Stage 8: `extend`

Stage 9: `project`