M2131_EventLogManagementPostureChanged_EL1

Status: available
Severity: medium
Time window: 7d
Group by: AssessedResourceId, MaturityLevel, RecommendationDisplayName
Source: github.com/Azure/Azure-Sentinel

'This alert is desinged to monitor Azure policies aligned with the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when EL1 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: 036ce0a8-a1ff-4731-a078-02b3207fa4f3
name: M2131_EventLogManagementPostureChanged_EL1
description: |
  'This alert is desinged to monitor Azure policies aligned with the Maturity Model for Event Log Management (M-21-31) standard. The alert triggers when EL1 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: |
  SecurityRecommendation
  | where RecommendationDisplayName <> ""
  | extend MaturityLevel=iff(RecommendationDisplayName has_any("agent","extension","retention","logs encryption","collect","retained","log profile","CloudTrail","metric","AWS","GCP","DNS","Auditing","Flow","logging","usage"), "Event Logging (EL0)",
  iff(RecommendationDisplayName has_any("container registries","logic apps","Enhanced monitoring","IoT Hub","Event Hub","App Service", "Kubernetes","updates","email", "automation", "adaptive"), "Advanced Event Logging (EL3)",
  iff(RecommendationDisplayName has_any("signatures","CMK","CMEK","double encryption","managed key","KMS","container","Watcher"), "Intermediate Event Logging (EL2)",
  iff(RecommendationDisplayName has_any("Exploit Guard","endpoint protection","Antimalware","health","VPC","Defender","Vulnerabilities","vulnerability","diagnostic","Key","activity log alert",""), "Basic Event Logging (EL1)","Other"))))
  | summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId, MaturityLevel
  | summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by MaturityLevel
  | extend PassedControls = (Passed/todouble(Total))*100
  | extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')
  | project MaturityLevel, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()
  | where MaturityLevel <> ''
  | where MaturityLevel == "Basic Event Logging (EL1)"
  | where PassedControls < 70 
  //Adjust Either FailedRatePercentage or PasedRatePercentage Thresholds within   Organizational Needs
  | sort by PassedControls desc
  | extend URLCustomEntity = RemediationLink
entityMappings:
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: URLCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Stage 1: `source`

SecurityRecommendation

Stage 2: `where`

| where RecommendationDisplayName <> ""

Stage 3: `extend`

| extend MaturityLevel=iff(RecommendationDisplayName has_any("agent","extension","retention","logs encryption","collect","retained","log profile","CloudTrail","metric","AWS","GCP","DNS","Auditing","Flow","logging","usage"), "Event Logging (EL0)",
iff(RecommendationDisplayName has_any("container registries","logic apps","Enhanced monitoring","IoT Hub","Event Hub","App Service", "Kubernetes","updates","email", "automation", "adaptive"), "Advanced Event Logging (EL3)",
iff(RecommendationDisplayName has_any("signatures","CMK","CMEK","double encryption","managed key","KMS","container","Watcher"), "Intermediate Event Logging (EL2)",
iff(RecommendationDisplayName has_any("Exploit Guard","endpoint protection","Antimalware","health","VPC","Defender","Vulnerabilities","vulnerability","diagnostic","Key","activity log alert",""), "Basic Event Logging (EL1)","Other"))))

MaturityLevel =

(RecommendationDisplayName contains "agent" or RecommendationDisplayName contains "extension" or RecommendationDisplayName contains "retention" or RecommendationDisplayName contains "logs encryption" or RecommendationDisplayName contains "collect" or RecommendationDisplayName contains "retained" or RecommendationDisplayName contains "log profile" or RecommendationDisplayName contains "CloudTrail" or RecommendationDisplayName contains "metric" or RecommendationDisplayName contains "AWS" or RecommendationDisplayName contains "GCP" or RecommendationDisplayName contains "DNS" or RecommendationDisplayName contains "Auditing" or RecommendationDisplayName contains "Flow" or RecommendationDisplayName contains "logging" or RecommendationDisplayName contains "usage")

"Event Logging (EL0)"

else

iff((RecommendationDisplayName has_any ("container registries", "logic apps", "Enhanced monitoring", "IoT Hub", "Event Hub", "App Service", "Kubernetes", "updates", "email", "automation", "adaptive")), "Advanced Event Logging (EL3)", iff((RecommendationDisplayName has_any ("signatures", "CMK", "CMEK", "double encryption", "managed key", "KMS", "container", "Watcher")), "Intermediate Event Logging (EL2)", iff((RecommendationDisplayName has_any ("Exploit Guard", "endpoint protection", "Antimalware", "health", "VPC", "Defender", "Vulnerabilities", "vulnerability", "diagnostic", "Key", "activity log alert", "")), "Basic Event Logging (EL1)", "Other")))

Stage 4: `summarize`

| summarize arg_max(TimeGenerated, *) by RecommendationDisplayName, AssessedResourceId, MaturityLevel

Stage 5: `summarize`

| summarize Failed = countif(RecommendationState == "Unhealthy"), Passed = countif(RecommendationState == "Healthy"), Total = countif(RecommendationState == "Healthy" or RecommendationState == "Unhealthy") by MaturityLevel

Stage 6: `extend`

| extend PassedControls = (Passed/todouble(Total))*100

Stage 7: `extend`

| extend RemediationLink = strcat('https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/22')

Stage 8: `project`

| project MaturityLevel, Total, PassedControls, Passed, Failed, RemediationLink, LastObserved=now()

Stage 9: `where`

| where MaturityLevel <> ''

Stage 10: `where`

| where MaturityLevel == "Basic Event Logging (EL1)"

Stage 11: `where`

| where PassedControls < 70

Stage 12: `sort`

| sort by PassedControls desc

Stage 13: `extend`

| extend URLCustomEntity = RemediationLink

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
`MaturityLevel`	eq	`Basic Event Logging (EL1)` transforms: `cased`
`PassedControls`	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
`Failed`	`project`
`LastObserved`	`project`
`MaturityLevel`	`project`
`Passed`	`project`
`PassedControls`	`project`
`RemediationLink`	`project`
`Total`	`project`
`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)

M2131_EventLogManagementPostureChanged_EL1

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `summarize`

Stage 5: `summarize`

Stage 6: `extend`

Stage 7: `extend`

Stage 8: `project`

Stage 9: `where`

Stage 10: `where`

Stage 11: `where`

Stage 12: `sort`

Stage 13: `extend`

Indicators

Output fields

Keyboard shortcuts

Search operators

M2131_EventLogManagementPostureChanged_EL1

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: summarize

Stage 5: summarize

Stage 6: extend

Stage 7: extend

Stage 8: project

Stage 9: where

Stage 10: where

Stage 11: where

Stage 12: sort

Stage 13: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `summarize`

Stage 5: `summarize`

Stage 6: `extend`

Stage 7: `extend`

Stage 8: `project`

Stage 9: `where`

Stage 10: `where`

Stage 11: `where`

Stage 12: `sort`

Stage 13: `extend`