Semperis DSP RBAC Changes

Status: available
Severity: medium
Time window: 30m
Source: github.com/Azure/Azure-Sentinel

'Alerts when there are RBAC changes in the DSP system.'

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1098` Account Manipulation
Privilege Escalation	`T1098` Account Manipulation, `T1548` Abuse Elevation Control Mechanism

Rule body kusto

id: "e5edf3f3-de53-45e6-b0d7-1ce1c048df4a"
name: Semperis DSP RBAC Changes
description: |
  'Alerts when there are RBAC changes in the DSP system.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: SemperisDSP
    dataTypes:
      - dsp_parser
queryFrequency: 30m
queryPeriod: 30m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - PrivilegeEscalation
  - Persistence
relevantTechniques:
  - T1548
  - T1098
query: |
  SecurityEvent
  | where EventSourceName == 'Semperis-Operation-Log' and EventID == 20012 
  | order by TimeGenerated desc
  | extend p1Xml = parse_xml(EventData).DataItem.EventData.Data
  | mv-expand bagexpansion=array p1Xml
  | evaluate bag_unpack(p1Xml)
  | extend Name=column_ifexists('@Name', ''), Value=column_ifexists('#text', '')
  | evaluate pivot(Name, any(Value), TimeGenerated, Computer, Level, EventLevelName, EventID, Type, _ResourceId)
  | extend det = column_ifexists('details', '')
  | parse det with "Occured at (UTC): " OccurredAt "Session ID: " SessionID "Trustee Name: " TrusteeName "Correlation ID: " CorrelationID "Source: " Source "WebSite Target: " WebSiteTarget "Product: " Product "Component: " Component "AD Information: " ADInformation "Object GUID: " ObjectGUID "Attribute: " Attribute "Distinguished Name: " DistinguishedName "Additional Information: "AdditionalInformation "Operation Detail: " OperationDetail "operationName: " operationName "trustee: " trustee "personas: " personas "Status: " status "Granted: " Granted "Result: " Result
  | extend _AccessGranted = iif(operationName contains "CreateRbacIdentity", "Added", "Removed")
  | extend _Identity = iif(operationName contains "CreateRbacIdentity", trustee, tostring(substring(trustee, 1, strlen(trustee))))
  | extend _Identity = iif(operationName contains "CreateRbacIdentity", _Identity, replace_string(_Identity, "'", ""))
  | extend add_personas = replace_string(replace_string(replace_string(personas, "{ Name = ", ""), " }", ""), ";", ",")
  | extend remove_personas = replace_string(personas, ";", ",")
  | extend grid_personas = iif(operationName contains "CreateRbacIdentity", add_personas, remove_personas)
  | extend date_to_sort = format_datetime(TimeGenerated, "yyyy-mm-dd   HH:mm:ss")
  | order by date_to_sort desc
  | extend NTDomain = tostring(split(TrusteeName, '\\', 0)[0]), LoginUser = tostring(split(TrusteeName, '\\', 1)[0])
  | extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: LoginUser
      - identifier: NTDomain
        columnName: NTDomain
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: DnsDomain
eventGroupingSettings:
  aggregationKind: SingleAlert
alertDetailsOverride:
  alertDisplayNameFormat: RBAC Change -- Alert from Semperis Directory Services Protector
  alertDescriptionFormat: A RBAC change was detected in the DSP system.
version: 2.0.7
kind: Scheduled

Stages and Predicates

Stage 1: `source`

SecurityEvent

Stage 2: `where`

| where EventSourceName == 'Semperis-Operation-Log' and EventID == 20012

Stage 3: `sort`

| order by TimeGenerated desc

Stage 4: `extend`

| extend p1Xml = parse_xml(EventData).DataItem.EventData.Data

Stage 5: `mv-expand`

| mv-expand bagexpansion=array p1Xml

Stage 6: `evaluate`

| evaluate bag_unpack(p1Xml)

Stage 7: `extend`

| extend Name=column_ifexists('@Name', ''), Value=column_ifexists('#text', '')

Stage 8: `evaluate`

| evaluate pivot(Name, any(Value), TimeGenerated, Computer, Level, EventLevelName, EventID, Type, _ResourceId)

Stage 9: `extend`

| extend det = column_ifexists('details', '')

Stage 10: `parse`

| parse det with "Occured at (UTC): " OccurredAt "Session ID: " SessionID "Trustee Name: " TrusteeName "Correlation ID: " CorrelationID "Source: " Source "WebSite Target: " WebSiteTarget "Product: " Product "Component: " Component "AD Information: " ADInformation "Object GUID: " ObjectGUID "Attribute: " Attribute "Distinguished Name: " DistinguishedName "Additional Information: "AdditionalInformation "Operation Detail: " OperationDetail "operationName: " operationName "trustee: " trustee "personas: " personas "Status: " status "Granted: " Granted "Result: " Result

Stage 11: `extend` (7 consecutive steps)

| extend _AccessGranted = iif(operationName contains "CreateRbacIdentity", "Added", "Removed")
| extend _Identity = iif(operationName contains "CreateRbacIdentity", trustee, tostring(substring(trustee, 1, strlen(trustee))))
| extend _Identity = iif(operationName contains "CreateRbacIdentity", _Identity, replace_string(_Identity, "'", ""))
| extend add_personas = replace_string(replace_string(replace_string(personas, "{ Name = ", ""), " }", ""), ";", ",")
| extend remove_personas = replace_string(personas, ";", ",")
| extend grid_personas = iif(operationName contains "CreateRbacIdentity", add_personas, remove_personas)
| extend date_to_sort = format_datetime(TimeGenerated, "yyyy-mm-dd   HH:mm:ss")

Stage 12: `sort`

| order by date_to_sort desc

Stage 13: `extend`

| extend NTDomain = tostring(split(TrusteeName, '\\', 0)[0]), LoginUser = tostring(split(TrusteeName, '\\', 1)[0])

Stage 14: `extend`

| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`EventID`	eq	`20012` transforms: `cased`
`EventSourceName`	eq	`Semperis-Operation-Log` transforms: `cased` corpus 2 (kusto 2)

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`p1Xml`	`extend`
`Name`	`extend`
`Value`	`extend`
`det`	`extend`
`_AccessGranted`	`extend`
`_Identity`	`extend`
`add_personas`	`extend`
`remove_personas`	`extend`
`grid_personas`	`extend`
`date_to_sort`	`extend`
`LoginUser`	`extend`
`NTDomain`	`extend`
`DnsDomain`	`extend`
`HostName`	`extend`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Semperis DSP RBAC Changes

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: `source`

Stage 2: `where`

Stage 3: `sort`

Stage 4: `extend`

Stage 5: `mv-expand`

Stage 6: `evaluate`

Stage 7: `extend`

Stage 8: `evaluate`

Stage 9: `extend`

Stage 10: `parse`

Stage 11: `extend` (7 consecutive steps)

Stage 12: `sort`

Stage 13: `extend`

Stage 14: `extend`

Indicators

Output fields

Keyboard shortcuts

Search operators

Semperis DSP RBAC Changes

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: sort

Stage 4: extend

Stage 5: mv-expand

Stage 6: evaluate

Stage 7: extend

Stage 8: evaluate

Stage 9: extend

Stage 10: parse

Stage 11: extend (7 consecutive steps)

Stage 12: sort

Stage 13: extend

Stage 14: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `sort`

Stage 4: `extend`

Stage 5: `mv-expand`

Stage 6: `evaluate`

Stage 7: `extend`

Stage 8: `evaluate`

Stage 9: `extend`

Stage 10: `parse`

Stage 11: `extend` (7 consecutive steps)

Stage 12: `sort`

Stage 13: `extend`

Stage 14: `extend`