NIST SP 800-53 Posture Changed

Status: available
Severity: medium
Time window: 7d
Group by: AssessedResourceId, ComplianceDomain, Failed, Passed, PassedControlsPercentage, RecommendationName, Total
Source: github.com/Azure/Azure-Sentinel

'This alert is desinged to monitor Azure policies aligned with the NIST SP 800-53 Regulatory Compliance initative. The alert triggers when policy compliance falls below 70% within a 1 week timeframe.'

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1082` System Information Discovery

Rule body kusto

id: dd834c97-4638-4bb3-a4e3-807e8b0580dc
name: NIST SP 800-53 Posture Changed
description: |
  'This alert is desinged to monitor Azure policies aligned with the NIST SP 800-53 Regulatory Compliance initative. The alert triggers when policy compliance falls below 70% within a 1 week timeframe.'
severity: Medium
status: Available
requiredDataConnectors: []
queryFrequency: 7d
queryPeriod: 7d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Discovery
relevantTechniques:
  - T1082
query: 
  let Last_Evaluated=SecurityRecommendation
  | join kind=fullouter(SecurityRegulatoryCompliance| where ComplianceStandard == "NIST-SP-800-53-R4") on RecommendationName
  | summarize arg_max(TimeGenerated, *) by AssessedResourceId, RecommendationName
  | extend ComplianceDomain=iff(ComplianceControl contains "AC.", "Access Control", iff(ComplianceControl contains "AT.", "Security Awareness & Training", iff(ComplianceControl contains "AU.", "Audit & Accountability", iff(ComplianceControl contains "CA.", "Security Assessment", iff(ComplianceControl contains "CM.", "Configuration Management", iff(ComplianceControl contains "CP.", "Contingency Planning", iff(ComplianceControl contains "IA.", "Identification & Authentication", iff(ComplianceControl contains "IR.", "Incident Response", iff(ComplianceControl contains "MA.", "System Maintenance", iff(ComplianceControl contains "MP.", "Media Protection", iff(ComplianceControl contains "PE.", "Physical Protection", iff(ComplianceControl contains "PL.", "Security Planning", iff(ComplianceControl contains "PS.", "Personnel Security",iff(ComplianceControl contains "RA.", "Risk Assessment",iff(ComplianceControl contains "SA.", "System & Services Acquisition",iff(ComplianceControl contains "SC.", "System & Communications Protection",iff(ComplianceControl contains "SI.", "System & Information Integrity","Other")))))))))))))))))
  | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by ComplianceDomain, TimeGenerated;
  SecurityRecommendation
  | join kind=fullouter(SecurityRegulatoryCompliance| where ComplianceStandard == "NIST-SP-800-53-R4") on RecommendationName
  | summarize arg_max(TimeGenerated, *) by AssessedResourceId, RecommendationName
  | extend ComplianceDomain=iff(ComplianceControl contains "AC.", "Access Control", iff(ComplianceControl contains "AT.", "Security Awareness & Training", iff(ComplianceControl contains "AU.", "Audit & Accountability", iff(ComplianceControl contains "CA.", "Security Assessment", iff(ComplianceControl contains "CM.", "Configuration Management", iff(ComplianceControl contains "CP.", "Contingency Planning", iff(ComplianceControl contains "IA.", "Identification & Authentication", iff(ComplianceControl contains "IR.", "Incident Response", iff(ComplianceControl contains "MA.", "System Maintenance", iff(ComplianceControl contains "MP.", "Media Protection", iff(ComplianceControl contains "PE.", "Physical Protection", iff(ComplianceControl contains "PL.", "Security Planning", iff(ComplianceControl contains "PS.", "Personnel Security",iff(ComplianceControl contains "RA.", "Risk Assessment",iff(ComplianceControl contains "SA.", "System & Services Acquisition",iff(ComplianceControl contains "SC.", "System & Communications Protection",iff(ComplianceControl contains "SI.", "System & Information Integrity","Other")))))))))))))))))
  | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by ComplianceDomain
  | extend PassedControlsPercentage = (Passed/todouble(Total))*100
  | join (Last_Evaluated) on ComplianceDomain
  | project ComplianceDomain, Total, PassedControlsPercentage, Passed, Failed, LastEvaluated=TimeGenerated
  | summarize arg_max(LastEvaluated, *) by ComplianceDomain, Total, PassedControlsPercentage, Passed, Failed
  | where PassedControlsPercentage < 70 
  | sort by PassedControlsPercentage, Passed desc
  | extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
  | extend URLCustomEntity = RemediationLink
entityMappings:
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: URLCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Let binding: `Last_Evaluated`

let Last_Evaluated = SecurityRecommendation | join kind=fullouter(SecurityRegulatoryCompliance| where ComplianceStandard == "NIST-SP-800-53-R4") on RecommendationName | summarize arg_max(TimeGenerated, *) by AssessedResourceId, RecommendationName | extend ComplianceDomain=iff(ComplianceControl contains "AC.", "Access Control", iff(ComplianceControl contains "AT.", "Security Awareness & Training", iff(ComplianceControl contains "AU.", "Audit & Accountability", iff(ComplianceControl contains "CA.", "Security Assessment", iff(ComplianceControl contains "CM.", "Configuration Management", iff(ComplianceControl contains "CP.", "Contingency Planning", iff(ComplianceControl contains "IA.", "Identification & Authentication", iff(ComplianceControl contains "IR.", "Incident Response", iff(ComplianceControl contains "MA.", "System Maintenance", iff(ComplianceControl contains "MP.", "Media Protection", iff(ComplianceControl contains "PE.", "Physical Protection", iff(ComplianceControl contains "PL.", "Security Planning", iff(ComplianceControl contains "PS.", "Personnel Security",iff(ComplianceControl contains "RA.", "Risk Assessment",iff(ComplianceControl contains "SA.", "System & Services Acquisition",iff(ComplianceControl contains "SC.", "System & Communications Protection",iff(ComplianceControl contains "SI.", "System & Information Integrity","Other"))))))))))))))))) | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by ComplianceDomain, TimeGenerated;

Stage 1: `source`

SecurityRecommendation

Stage 2: `join`

join kind=fullouter (...)

Stage 3: `summarize`

summarize by AssessedResourceId, RecommendationName

Stage 4: `extend`

extend ComplianceDomain

ComplianceDomain =

ifComplianceControl contains "AC.""Access Control"

else

iff((ComplianceControl contains "AT."), "Security Awareness & Training", iff((ComplianceControl contains "AU."), "Audit & Accountability", iff((ComplianceControl contains "CA."), "Security Assessment", iff((ComplianceControl contains "CM."), "Configuration Management", iff((ComplianceControl contains "CP."), "Contingency Planning", iff((ComplianceControl contains "IA."), "Identification & Authentication", iff((ComplianceControl contains "IR."), "Incident Response", iff((ComplianceControl contains "MA."), "System Maintenance", iff((ComplianceControl contains "MP."), "Media Protection", iff((ComplianceControl contains "PE."), "Physical Protection", iff((ComplianceControl contains "PL."), "Security Planning", iff((ComplianceControl contains "PS."), "Personnel Security", iff((ComplianceControl contains "RA."), "Risk Assessment", iff((ComplianceControl contains "SA."), "System & Services Acquisition", iff((ComplianceControl contains "SC."), "System & Communications Protection", iff((ComplianceControl contains "SI."), "System & Information Integrity", "Other"))))))))))))))))

Stage 5: `summarize`

summarize Failed, Passed, Total by ComplianceDomain

Stage 6: `extend`

extend PassedControlsPercentage

Stage 7: `join`

join (...)

Stage 8: `project`

project ComplianceDomain, Failed, LastEvaluated, Passed, PassedControlsPercentage, Total

Stage 9: `summarize`

summarize by ComplianceDomain, Total, PassedControlsPercentage, Passed, Failed

Stage 10: `where`

where PassedControlsPercentage < 70

Stage 11: `sort`

sort by Passed, PassedControlsPercentage

Stage 12: `extend`

extend RemediationLink

Stage 13: `extend`

extend URLCustomEntity

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
`ComplianceStandard`	eq	`NIST-SP-800-53-R4` transforms: `cased`
`PassedControlsPercentage`	lt	`70` transforms: `cased`

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
`ComplianceDomain`	`summarize`
`Failed`	`summarize`
`Passed`	`summarize`
`PassedControlsPercentage`	`summarize`
`Total`	`summarize`
`RemediationLink`	`extend`
`URLCustomEntity`	`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)

NIST SP 800-53 Posture Changed

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: `Last_Evaluated`

Stage 1: `source`

Stage 2: `join`

Stage 3: `summarize`

Stage 4: `extend`

Stage 5: `summarize`

Stage 6: `extend`

Stage 7: `join`

Stage 8: `project`

Stage 9: `summarize`

Stage 10: `where`

Stage 11: `sort`

Stage 12: `extend`

Stage 13: `extend`

Indicators

Output fields

Keyboard shortcuts

Search operators

NIST SP 800-53 Posture Changed

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: Last_Evaluated

Stage 1: source

Stage 2: join

Stage 3: summarize

Stage 4: extend

Stage 5: summarize

Stage 6: extend

Stage 7: join

Stage 8: project

Stage 9: summarize

Stage 10: where

Stage 11: sort

Stage 12: extend

Stage 13: extend

Indicators

Output fields

Let binding: `Last_Evaluated`

Stage 1: `source`

Stage 2: `join`

Stage 3: `summarize`

Stage 4: `extend`

Stage 5: `summarize`

Stage 6: `extend`

Stage 7: `join`

Stage 8: `project`

Stage 9: `summarize`

Stage 10: `where`

Stage 11: `sort`

Stage 12: `extend`

Stage 13: `extend`