ApexOne - Possible exploit or execute operation

Status: available
Severity: high
Time window: 1h
Source: github.com/Azure/Azure-Sentinel

'Detects possible exploit or execute operation.'

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1546` Event Triggered Execution
Privilege Escalation	`T1546` Event Triggered Execution

Rule body

id: e289d762-6cc2-11ec-90d6-0242ac120003
name: ApexOne - Possible exploit or execute operation
description: |
  'Detects possible exploit or execute operation.'
severity: High
status: Available
requiredDataConnectors:
  - connectorId: CefAma
    dataTypes:
      - CommonSecurityLog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - PrivilegeEscalation
  - Persistence
relevantTechniques:
  - T1546
query: |
  TMApexOneEvent
  | where EventMessage has "Behavior Monitoring"
  | extend DeviceCustomNumber3 = coalesce(column_ifexists("FieldDeviceCustomNumber3", long(null)),DeviceCustomNumber3)
  | where Event_Type == 2048 or DeviceCustomNumber3 == 403 or DeviceCustomNumber3 == 601
  | extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = DstUserName
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountCustomEntity
version: 1.0.5
kind: Scheduled

Stages and Predicates

Stage 1: `source`

TMApexOneEvent

Stage 2: `where`

| where EventMessage has "Behavior Monitoring"

Stage 3: `extend`

| extend DeviceCustomNumber3 = coalesce(column_ifexists("FieldDeviceCustomNumber3", long(null)),DeviceCustomNumber3)

Stage 4: `where`

| where Event_Type == 2048 or DeviceCustomNumber3 == 403 or DeviceCustomNumber3 == 601

Stage 5: `extend`

| extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = DstUserName

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`DeviceCustomNumber3`	eq	`403` `601`	`field:"DeviceCustomNumber3" kind:eq`
`EventMessage`	match	`Behavior Monitoring` transforms: `term`	`field:"EventMessage" kind:match value:"Behavior Monitoring"`
`Event_Type`	eq	`2048`	`field:"Event_Type" kind:eq value:"2048"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`DeviceCustomNumber3`	`extend`
`AccountCustomEntity`	`extend`
`IPCustomEntity`	`extend`

ApexOne - Possible exploit or execute operation

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: where

Stage 5: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `where`

Stage 5: `extend`