1Password - Potential insider privilege escalation via group

Severity: medium
Time window: 5m
Source: github.com/Azure/Azure-Sentinel

This will alert when an actor grants, or updates their own permissions via a group. Once this analytics rule is triggered it will group all related future alerts for upto an hour when all related entities are the same. Ref: https://1password.com/ Ref: https://github.com/securehats/

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1078` Valid Accounts

Telemetry coverage

Platform	Record / event type
1Password	any: Group membership (catch-all)

Rule body

id: 398a1cf1-f56f-4700-912c-9bf4c8409ebc
name: 1Password - Potential insider privilege escalation via group
version: 1.0.0
kind: Scheduled
description: |-
  This will alert when an actor grants, or updates their own permissions via a group. Once this analytics rule is triggered it will group all related future alerts for upto an hour when all related entities are the same.

  Ref: https://1password.com/
  Ref: https://github.com/securehats/
severity: Medium
requiredDataConnectors:
  - connectorId: 1Password
    dataTypes:
      - OnePasswordEventLogs_CL
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: gt
triggerThreshold: 0
tactics:
- PrivilegeEscalation
relevantTechniques:
- T1078
query: |-
  OnePasswordEventLogs_CL
  | where log_source == "auditevents"
  | where action has_any("join", "role")
  | where object_type == "gm"
  | where tostring(actor_details.email) == tostring(aux_details.email)
  | extend
      TargetUsername = aux_details.email
      , ActorUsername = actor_details.email
      , SrcIpAddr = session.ip
      , GroupRole = case(
          aux_info == "R", "Group member"
          , aux_info == "A", "Group manager"
          , aux_info
      )
subTechniques:
- T1078.004
suppressionEnabled: false
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1h
    matchingMethod: AllEntities
suppressionDuration: 5h
eventGroupingSettings:
  aggregationKind: SingleAlert
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: ActorUsername
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: TargetUsername
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr

Stages and Predicates

Stage 1: `source`

OnePasswordEventLogs_CL

Stage 2: `where`

| where log_source == "auditevents"

Stage 3: `where`

| where action has_any("join", "role")

Stage 4: `where`

| where object_type == "gm"

Stage 5: `where`

| where tostring(actor_details.email) == tostring(aux_details.email)

Stage 6: `extend`

| extend
    TargetUsername = aux_details.email
    , ActorUsername = actor_details.email
    , SrcIpAddr = session.ip
    , GroupRole = case(
        aux_info == "R", "Group member"
        , aux_info == "A", "Group manager"
        , aux_info
    )

GroupRole =

ifaux_info == "R""Group member"

elifaux_info == "A""Group manager"

elseaux_info

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`action`	match	`join` transforms: `term` `role` transforms: `term`	`field:"action" kind:match`
`log_source`	eq	`auditevents`	`field:"log_source" kind:eq value:"auditevents"`
`object_type`	eq	`gm`	`field:"object_type" kind:eq value:"gm"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`ActorUsername`	`extend`
`GroupRole`	`extend`
`SrcIpAddr`	`extend`
`TargetUsername`	`extend`

1Password - Potential insider privilege escalation via group

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: where

Stage 6: extend