Preview - TI map URL entity to Cloud App Events

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Id	e8ae92dd-1d41-4530-8be8-85c5014c7b47
Rulename	Preview - TI map URL entity to Cloud App Events
Description	Identifies compromises and attacks and detect malicious activities in one’s URL entity from TI
Severity	Medium
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	MicrosoftDefenderThreatIntelligence MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_CloudAppEvents.yaml
Version	1.0.3
Arm template	e8ae92dd-1d41-4530-8be8-85c5014c7b47.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| where isnotempty(Url)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| join kind=innerunique (CloudAppEvents
| where TimeGenerated >= ago(dt_lookBack)
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1, tostring(ActivityObjects))
| extend userPrincipalName = tostring(RawEventData.UserId)
| extend TargetResourceDisplayName = tostring(ActivityObjects[0].displayName)
| extend CloudApps_TimeGenerated = TimeGenerated) on Url
| where CloudApps_TimeGenerated < ExpirationDateTime
| summarize CloudApps_TimeGenerated = argmax(CloudApps_TimeGenerated, *) by IndicatorId, Url
| extend Description = max_CloudApps_TimeGenerated_Description, ActivityGroupNames = max_CloudApps_TimeGenerated_ActivityGroupNames, ThreatType = max_CloudApps_TimeGenerated_ThreatType, ExpirationDateTime = max_CloudApps_TimeGenerated_ExpirationDateTime, ConfidenceScore = max_CloudApps_TimeGenerated_ConfidenceScore, IPAddress = max_CloudApps_TimeGenerated_IPAddress, AccountObjectId = max_CloudApps_TimeGenerated_AccountObjectId, AccountDisplayName = max_CloudApps_TimeGenerated_AccountDisplayName, ObjectName = max_CloudApps_TimeGenerated_ObjectName, Application= max_CloudApps_TimeGenerated_Application, ApplicationID = max_CloudApps_TimeGenerated_ApplicationId, userPrincipalName = max_CloudApps_TimeGenerated_userPrincipalName
| project CloudApps_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, IPAddress, userPrincipalName, AccountObjectId, AccountDisplayName, ObjectName, Application, ApplicationID

YAML

queryPeriod: 14d
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | where isnotempty(Url)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | join kind=innerunique (CloudAppEvents
  | where TimeGenerated >= ago(dt_lookBack)
  | extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1, tostring(ActivityObjects))
  | extend userPrincipalName = tostring(RawEventData.UserId)
  | extend TargetResourceDisplayName = tostring(ActivityObjects[0].displayName)
  | extend CloudApps_TimeGenerated = TimeGenerated) on Url
  | where CloudApps_TimeGenerated < ExpirationDateTime
  | summarize CloudApps_TimeGenerated = argmax(CloudApps_TimeGenerated, *) by IndicatorId, Url
  | extend Description = max_CloudApps_TimeGenerated_Description, ActivityGroupNames = max_CloudApps_TimeGenerated_ActivityGroupNames, ThreatType = max_CloudApps_TimeGenerated_ThreatType, ExpirationDateTime = max_CloudApps_TimeGenerated_ExpirationDateTime, ConfidenceScore = max_CloudApps_TimeGenerated_ConfidenceScore, IPAddress = max_CloudApps_TimeGenerated_IPAddress, AccountObjectId = max_CloudApps_TimeGenerated_AccountObjectId, AccountDisplayName = max_CloudApps_TimeGenerated_AccountDisplayName, ObjectName = max_CloudApps_TimeGenerated_ObjectName, Application= max_CloudApps_TimeGenerated_Application, ApplicationID = max_CloudApps_TimeGenerated_ApplicationId, userPrincipalName = max_CloudApps_TimeGenerated_userPrincipalName
  | project CloudApps_TimeGenerated, Description, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, Url, IPAddress, userPrincipalName, AccountObjectId, AccountDisplayName, ObjectName, Application, ApplicationID  
name: Preview - TI map URL entity to Cloud App Events
entityMappings:
- fieldMappings:
  - columnName: AccountObjectId
    identifier: ObjectGuid
  - columnName: userPrincipalName
    identifier: FullName
  - columnName: AccountDisplayName
    identifier: DisplayName
  entityType: Account
- fieldMappings:
  - columnName: Url
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: IPAddress
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: Application
    identifier: Name
  - columnName: ApplicationID
    identifier: AppId
  entityType: CloudApplication
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_CloudAppEvents.yaml
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - CloudAppEvents
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
description: |
    'Identifies compromises and attacks and detect malicious activities in one's URL entity from TI'
kind: Scheduled
version: 1.0.3
queryFrequency: 1h
severity: Medium
relevantTechniques:
- T1071
triggerOperator: gt
triggerThreshold: 0
tactics:
- CommandAndControl
id: e8ae92dd-1d41-4530-8be8-85c5014c7b47

ARM