1Password - Secret extraction post vault access change by administrator

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

This will alert when a secret extraction has occurred after an administrator has changed their own vault access permissions within that same vault. Ref: https://1password.com/ Ref: https://github.com/securehats/

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1555` Credentials from Password Stores

Telemetry coverage

Platform	Record / event type
1Password	any: Item usage (catch-all)
1Password	uva-grant: Grant User Vault Access
1Password	uva-update: Update User Vault Access

Rule body

id: 6711b747-16d7-4df4-9f61-8633617f45d7
name: 1Password - Secret extraction post vault access change by administrator
version: 1.0.0
kind: Scheduled
description: |-
  This will alert when a secret extraction has occurred after an administrator has changed their own vault access permissions within that same vault.
  Ref: https://1password.com/
  Ref: https://github.com/securehats/
severity: High
requiredDataConnectors:
  - connectorId: 1Password
    dataTypes:
      - OnePasswordEventLogs_CL
queryFrequency: 5m
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- CredentialAccess
relevantTechniques:
- T1555
query: |-
  let lookback = 1h;
  let secretExtractionActivity =
      OnePasswordEventLogs_CL
      | where TimeGenerated between (ago(lookback) .. now())
      | where log_source == "itemusages"
      | where action has_any("server-fetch", "reveal", "secure-copy")
  ;
  OnePasswordEventLogs_CL
  | where log_source == "auditevents"
  | where (action == "grant" and object_type  == "uva") or (action == "update" and object_type  == "uva")
  | where tostring(actor_details.uuid) == tostring(aux_details.uuid)
  | extend
      userUuid = tostring(actor_details.uuid)
      , vaultUuid = tostring(object_uuid)
  | join (
      secretExtractionActivity
      | extend
          userUuid = tostring(user.uuid)
          , vaultUuid = tostring(vault_uuid)
      )
      on $left.userUuid == $right.userUuid and $left.vaultUuid == $right.vaultUuid
  | extend
      auditevents = bag_pack("action", action, "object_type", object_type)
      , itemusages = bag_pack("action", action1, "object_type", object_type1)
      , vault_details = bag_pack("vault_uuid", vault_uuid1, "item_uuid", item_uuid1)
  | project
      TimeGenerated
      , actor_details
      , target_details = aux_details
      , location_details = location
      , client_details = client1
      , auditevents
      , itemusages
      , vault_details
      , TargetUsername = tostring(user1.email)
      , SrcIpAddr = tostring(client1.ip_address)
suppressionEnabled: false
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1h
    matchingMethod: AllEntities
suppressionDuration: 1h
eventGroupingSettings:
  aggregationKind: SingleAlert
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: TargetUsername
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr

Stages and Predicates

Parameters

let lookback = 1h;

Let binding: `secretExtractionActivity` used in Stage 6

let secretExtractionActivity = OnePasswordEventLogs_CL
    | where TimeGenerated between (ago(lookback) .. now())
    | where log_source == "itemusages"
    | where action has_any("server-fetch", "reveal", "secure-copy");

Stage 1: `source`

OnePasswordEventLogs_CL

Stage 2: `where`

| where log_source == "auditevents"

Stage 3: `where`

| where (action == "grant" and object_type  == "uva") or (action == "update" and object_type  == "uva")

Stage 4: `where`

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

Stage 5: `extend`

| extend
    userUuid = tostring(actor_details.uuid)
    , vaultUuid = tostring(object_uuid)

Stage 6: `join`

| join (
    secretExtractionActivity
    | extend
        userUuid = tostring(user.uuid)
        , vaultUuid = tostring(vault_uuid)
    )
    on $left.userUuid == $right.userUuid and $left.vaultUuid == $right.vaultUuid

Stage 7: `extend`

| extend
    auditevents = bag_pack("action", action, "object_type", object_type)
    , itemusages = bag_pack("action", action1, "object_type", object_type1)
    , vault_details = bag_pack("vault_uuid", vault_uuid1, "item_uuid", item_uuid1)

Stage 8: `project`

| project
    TimeGenerated
    , actor_details
    , target_details = aux_details
    , location_details = location
    , client_details = client1
    , auditevents
    , itemusages
    , vault_details
    , TargetUsername = tostring(user1.email)
    , SrcIpAddr = tostring(client1.ip_address)

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`action`	eq	`grant` `update`	`field:"action" kind:eq`
`action`	match	`reveal` transforms: `term` `secure-copy` transforms: `term` `server-fetch` transforms: `term`	`field:"action" kind:match`
`log_source`	eq	`auditevents` `itemusages`	`field:"log_source" kind:eq`
`object_type`	eq	`uva`	`field:"object_type" kind:eq value:"uva"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`SrcIpAddr`	`project`
`TargetUsername`	`project`
`TimeGenerated`	`project`
`actor_details`	`project`
`auditevents`	`project`
`client_details`	`project`
`itemusages`	`project`
`location_details`	`project`
`target_details`	`project`
`vault_details`	`project`

1Password - Secret extraction post vault access change by administrator

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Parameters

Let binding: secretExtractionActivity used in Stage 6

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: extend

Stage 6: join

Stage 7: extend

Stage 8: project