UniFi Site Manager: System log shipping disabled

Status: available
Severity: high
Time window: 45m
Group by: Id, id_s
Source: github.com/Azure/Azure-Sentinel

Identifies when a UniFi host transitions cloudSystemLogState from enabled to disabled. This defense-evasion signal may indicate an attacker silencing audit trails.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1685` Disable or Modify Tools

Rule body

id: f32950bc-6553-4c03-2686-a9c29ef318e8
name: "UniFi Site Manager: System log shipping disabled"
description: |
  Identifies when a UniFi host transitions cloudSystemLogState from enabled to disabled. This defense-evasion signal may indicate an attacker silencing audit trails.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: UniFiSiteManagerConnectorDefinition
    dataTypes:
      - Unifi_SiteManager_Hosts_CL
queryFrequency: 15m
queryPeriod: 45m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - DefenseEvasion
relevantTechniques:
  - T1562
subTechniques:
  - T1562.006
  - T1562.008
query: |
  let prev = Unifi_SiteManager_Hosts_CL
            | where TimeGenerated between (ago(30m) .. ago(15m))
            | summarize arg_max(TimeGenerated, *) by Id
            | project id_s = Id, prevState = tostring(ReportedState.cloudSystemLogState);
        Unifi_SiteManager_Hosts_CL
        | where TimeGenerated > ago(15m)
        | summarize arg_max(TimeGenerated, *) by Id
        | extend id_s = Id,
                 SiteName = tostring(ReportedState.name),
                 currentState = tostring(ReportedState.cloudSystemLogState)
        | join kind=inner prev on id_s
        | where currentState == 'disabled' and prevState == 'enabled'
        | extend Activity = strcat('Cloud system log shipping was disabled on host ', SiteName, ' (', prevState, ' -> ', currentState, ')')
        | project TimeGenerated, Id, SiteName, Activity, prevState, currentState
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: Id
      - identifier: DnsDomain
        columnName: SiteName
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: PT12H
    matchingMethod: AllEntities
kind: Scheduled
version: 1.0.1

Stages and Predicates

Let binding: `prev` used in Stage 5

let prev = Unifi_SiteManager_Hosts_CL
          | where TimeGenerated between (ago(30m) .. ago(15m))
          | summarize arg_max(TimeGenerated, *) by Id
          | project id_s = Id, prevState = tostring(ReportedState.cloudSystemLogState);

Stage 1: `source`

Unifi_SiteManager_Hosts_CL

Stage 2: `where`

| where TimeGenerated > ago(15m)

Stage 3: `summarize`

| summarize arg_max(TimeGenerated, *) by Id

Stage 4: `extend`

| extend id_s = Id,
               SiteName = tostring(ReportedState.name),
               currentState = tostring(ReportedState.cloudSystemLogState)

Stage 5: `join`

| join kind=inner prev on id_s

Stage 6: `where`

| where currentState == 'disabled' and prevState == 'enabled'

Stage 7: `extend`

| extend Activity = strcat('Cloud system log shipping was disabled on host ', SiteName, ' (', prevState, ' -> ', currentState, ')')

Stage 8: `project`

| project TimeGenerated, Id, SiteName, Activity, prevState, currentState

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`currentState`	eq	`disabled`	`field:"currentState" kind:eq value:"disabled"`
`prevState`	eq	`enabled`	`field:"prevState" kind:eq value:"enabled"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`Activity`	`project`
`Id`	`project`
`SiteName`	`project`
`TimeGenerated`	`project`
`currentState`	`project`
`prevState`	`project`

UniFi Site Manager: System log shipping disabled

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Let binding: prev used in Stage 5

Stage 1: source

Stage 2: where

Stage 3: summarize

Stage 4: extend

Stage 5: join

Stage 6: where

Stage 7: extend

Stage 8: project