TI map Domain entity to EmailUrlInfo

Severity: medium
Time window: 14d
Group by: DomainName, IndicatorId, Url, UrlDomain
Source: github.com/Azure/Azure-Sentinel

'Identifies a match in EmailUrlInfo table from any Domain IOC from TI.'

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1566` Phishing

Rule body kusto

id: 87cc75df-d7b2-44f1-b064-ee924edfc879
name: TI map Domain entity to EmailUrlInfo
description: |
  'Identifies a match in EmailUrlInfo table from any Domain IOC from TI.'
severity: Medium
requiredDataConnectors:
  - connectorId: Office365
    dataTypes:
      - EmailUrlInfo
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: MicrosoftDefenderThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
relevantTechniques:
  - T1566
query: |
    let dt_lookBack = 1h; // Define the lookback period for email data as 1 hour
    let ioc_lookBack = 14d; // Define the lookback period for threat intelligence data as 14 days
    let EmailUrlInfo_ = EmailUrlInfo
    | where isnotempty(Url) or isnotempty(UrlDomain) // Filter for non-empty URLs or URL domains
    | where TimeGenerated >= ago(dt_lookBack) // Filter for records within the lookback period
    | extend Url = tolower(Url), UrlDomain = tolower(UrlDomain) // Convert URLs and domains to lowercase
    | extend EmailUrlInfo_TimeGenerated = TimeGenerated; // Create a new column for the time generated
    let EmailEvents_ = EmailEvents
    | where TimeGenerated >= ago(dt_lookBack); // Filter email events within the lookback period
    let TI_Urls = ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
    | where isnotempty(Url) // Filter for non-empty URLs
    | extend Url = tolower(Url) // Convert URLs to lowercase
    | join kind=innerunique (EmailUrlInfo_) on Url // Join with email URL info on URL
    | where Active == true and ExpirationDateTime > now() // Filter for active indicators that haven't expired
    | where EmailUrlInfo_TimeGenerated < ExpirationDateTime // Ensure email info was generated before the indicator expired
    | summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, Url // Get the latest email info for each indicator
    | project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, UrlLocation, NetworkMessageId; // Select relevant columns
    let TI_Domains = ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack) // Filter threat intelligence indicators within the lookback period
    | where isnotempty(DomainName) // Filter for non-empty domain names
    | extend DomainName = tolower(DomainName) // Convert domain names to lowercase
    | join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain // Join with email URL info on domain name
    | where Active == true and ExpirationDateTime > now() // Filter for active indicators that haven't expired
    | where EmailUrlInfo_TimeGenerated < ExpirationDateTime // Ensure email info was generated before the indicator expired
    | summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, UrlDomain // Get the latest email info for each indicator
    | project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, UrlDomain, UrlLocation, NetworkMessageId; // Select relevant columns
    union TI_Urls, TI_Domains // Combine URL and domain threat intelligence data
    | extend timestamp = EmailUrlInfo_TimeGenerated // Add a timestamp column
    | join kind=inner (EmailEvents_) on NetworkMessageId // Join with email events on network message ID
    | where DeliveryAction !has "Blocked" // Filter out blocked delivery actions
    | extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0]); // Extract name and UPN suffix from recipient email address
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: RecipientEmailAddress
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Url
version: 1.0.3
kind: Scheduled

Stages and Predicates

Parameters

let dt_lookBack = 1h;
let ioc_lookBack = 14d;

Let binding: `EmailUrlInfo_`

let EmailUrlInfo_ = EmailUrlInfo
| where isnotempty(Url) or isnotempty(UrlDomain)
| where TimeGenerated >= ago(dt_lookBack)
| extend Url = tolower(Url), UrlDomain = tolower(UrlDomain)
| extend EmailUrlInfo_TimeGenerated = TimeGenerated;

Derived from dt_lookBack.

Let binding: `EmailEvents_`

let EmailEvents_ = EmailEvents
| where TimeGenerated >= ago(dt_lookBack);

Derived from dt_lookBack.

Let binding: `TI_Urls`

let TI_Urls = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| where isnotempty(Url)
| extend Url = tolower(Url)
| join kind=innerunique (EmailUrlInfo_) on Url
| where Active == true and ExpirationDateTime > now()
| where EmailUrlInfo_TimeGenerated < ExpirationDateTime
| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, Url
| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, UrlLocation, NetworkMessageId;

Derived from ioc_lookBack, EmailUrlInfo_.

Let binding: `TI_Domains`

let TI_Domains = ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| where isnotempty(DomainName)
| extend DomainName = tolower(DomainName)
| join kind=innerunique (EmailUrlInfo_) on $left.DomainName == $right.UrlDomain
| where Active == true and ExpirationDateTime > now()
| where EmailUrlInfo_TimeGenerated < ExpirationDateTime
| summarize EmailUrlInfo_TimeGenerated = arg_max(EmailUrlInfo_TimeGenerated, *) by IndicatorId, UrlDomain
| project EmailUrlInfo_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, UrlDomain, UrlLocation, NetworkMessageId;

Derived from ioc_lookBack, EmailUrlInfo_.

union (2 sources)

Each leg below queries one source; the rule matches if any leg does. Sources: TI_Urls, TI_Domains

Leg 1: `TI_Urls`

Leg 2: `TI_Domains`

Applied to the combined result

| extend timestamp = EmailUrlInfo_TimeGenerated | join kind=inner (EmailEvents_) on NetworkMessageId | where DeliveryAction !has "Blocked" | extend Name = tostring(split(RecipientEmailAddress, '@', 0)[0]), UPNSuffix = tostring(split(RecipientEmailAddress, '@', 1)[0]);

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`DeliveryAction`	match	`Blocked`

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
`Active`	eq	`true` transforms: `cased`
`DomainName`	is_not_null	(no value, null check)
`EmailUrlInfo_TimeGenerated`	lt	`ExpirationDateTime` transforms: `cased`
`Url`	is_not_null	(no value, null check)
`UrlDomain`	is_not_null	(no value, null check)

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
`ActivityGroupNames`	`project`
`ConfidenceScore`	`project`
`Description`	`project`
`EmailUrlInfo_TimeGenerated`	`project`
`ExpirationDateTime`	`project`
`IndicatorId`	`project`
`NetworkMessageId`	`project`
`ThreatType`	`project`
`UrlDomain`	`project`
`UrlLocation`	`project`
`timestamp`	`extend`
`Name`	`extend`
`UPNSuffix`	`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)

TI map Domain entity to EmailUrlInfo

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Let binding: `EmailUrlInfo_`

Let binding: `EmailEvents_`

Let binding: `TI_Urls`

Let binding: `TI_Domains`

union (2 sources)

Leg 1: `TI_Urls`

Leg 2: `TI_Domains`

Applied to the combined result

Exclusions

Indicators

Output fields

Keyboard shortcuts

Search operators

TI map Domain entity to EmailUrlInfo

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Parameters

Let binding: EmailUrlInfo_

Let binding: EmailEvents_

Let binding: TI_Urls

Let binding: TI_Domains

union (2 sources)

Leg 1: TI_Urls

Leg 2: TI_Domains

Applied to the combined result

Exclusions

Indicators

Output fields

Let binding: `EmailUrlInfo_`

Let binding: `EmailEvents_`

Let binding: `TI_Urls`

Let binding: `TI_Domains`

Leg 1: `TI_Urls`

Leg 2: `TI_Domains`