TI Map URL Entity to DeviceNetworkEvents

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Id	6ddbd892-a9be-47be-bab7-521241695bd6
Rulename	TI Map URL Entity to DeviceNetworkEvents
Description	This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.
Severity	Medium
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	MicrosoftDefenderThreatIntelligence MicrosoftThreatProtection ThreatIntelligence ThreatIntelligenceTaxii
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_DeviceNetworkEvents.yaml
Version	1.0.2
Arm template	6ddbd892-a9be-47be-bab7-521241695bd6.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceNetworkEvents_ = DeviceNetworkEvents
  | where isnotempty(RemoteUrl)
  | where TimeGenerated >= ago(dt_lookBack)
  | where ActionType !has "ConnectionFailed"
  | extend RemoteUrl = tolower(RemoteUrl)
  | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
let DeviceNetworkEventUrls = DeviceNetworkEvents_
  | distinct Url = RemoteUrl
  | summarize make_list(Url);
ThreatIntelligenceIndicator
| where isnotempty(Url)
| where TimeGenerated >= ago(ioc_lookBack)
| extend Url = tolower(Url)
| where Url in (DeviceNetworkEventUrls)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| join kind=innerunique (DeviceNetworkEvents_) on $left.Url == $right.RemoteUrl
| where DeviceNetworkEvents_TimeGenerated < ExpirationDateTime
| summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by IndicatorId, Url
| project DeviceNetworkEvents_TimeGenerated, IndicatorId, Url, ConfidenceScore, Description, ThreatType, Tags, TrafficLightProtocolLevel, ActionType, DeviceId, DeviceName, InitiatingProcessAccountUpn, InitiatingProcessCommandLine, RemoteIP, RemotePort
| extend Name = tostring(split(InitiatingProcessAccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@', 1)[0])
| extend timestamp = DeviceNetworkEvents_TimeGenerated, UserPrincipalName = InitiatingProcessAccountUpn

YAML

description: |
    'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in DeviceNetworkEvents.'
kind: Scheduled
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_DeviceNetworkEvents.yaml
triggerOperator: gt
severity: Medium
relevantTechniques:
- T1071
triggerThreshold: 0
name: TI Map URL Entity to DeviceNetworkEvents
entityMappings:
- fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: DeviceName
    identifier: FullName
  entityType: Host
- fieldMappings:
  - columnName: Url
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: InitiatingProcessCommandLine
    identifier: CommandLine
  entityType: Process
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceNetworkEvents
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
id: 6ddbd892-a9be-47be-bab7-521241695bd6
queryPeriod: 14d
tactics:
- CommandAndControl
version: 1.0.2
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let DeviceNetworkEvents_ = DeviceNetworkEvents
    | where isnotempty(RemoteUrl)
    | where TimeGenerated >= ago(dt_lookBack)
    | where ActionType !has "ConnectionFailed"
    | extend RemoteUrl = tolower(RemoteUrl)
    | project-rename DeviceNetworkEvents_TimeGenerated = TimeGenerated;
  let DeviceNetworkEventUrls = DeviceNetworkEvents_
    | distinct Url = RemoteUrl
    | summarize make_list(Url);
  ThreatIntelligenceIndicator
  | where isnotempty(Url)
  | where TimeGenerated >= ago(ioc_lookBack)
  | extend Url = tolower(Url)
  | where Url in (DeviceNetworkEventUrls)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
  | join kind=innerunique (DeviceNetworkEvents_) on $left.Url == $right.RemoteUrl
  | where DeviceNetworkEvents_TimeGenerated < ExpirationDateTime
  | summarize DeviceNetworkEvents_TimeGenerated = arg_max(DeviceNetworkEvents_TimeGenerated, *) by IndicatorId, Url
  | project DeviceNetworkEvents_TimeGenerated, IndicatorId, Url, ConfidenceScore, Description, ThreatType, Tags, TrafficLightProtocolLevel, ActionType, DeviceId, DeviceName, InitiatingProcessAccountUpn, InitiatingProcessCommandLine, RemoteIP, RemotePort
  | extend Name = tostring(split(InitiatingProcessAccountUpn, '@', 0)[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@', 1)[0])
  | extend timestamp = DeviceNetworkEvents_TimeGenerated, UserPrincipalName = InitiatingProcessAccountUpn

ARM