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

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

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Category`	eq	`illusive:alerts`	`field:"Category" kind:eq value:"illusive:alerts"`
`DeviceProduct`	eq	`illusive`	`field:"DeviceProduct" kind:eq value:"illusive"`

Output fields

These fields are emitted when the rule matches.

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`

Illusive Incidents Analytic Rule

MITRE ATT&CK coverage

Rule body

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