TI Map URL Entity to AuditLogs
Id | 712fab52-2a7d-401e-a08c-ff939cc7c25e |
Rulename | TI Map URL Entity to AuditLogs |
Description | This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in AuditLogs. |
Severity | Medium |
Tactics | Impact |
Required data connectors | AzureActiveDirectory MicrosoftDefenderThreatIntelligence 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_AuditLogs.yaml |
Version | 1.2.4 |
Arm template | 712fab52-2a7d-401e-a08c-ff939cc7c25e.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(Url)
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
AuditLogs
| where TimeGenerated >= ago(dt_lookBack)
// Extract the URL that is contained within the JSON data
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,tostring(TargetResources))
| where isnotempty(Url)
| extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
| extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)
| extend Audit_TimeGenerated = TimeGenerated
) on Url
| where Audit_TimeGenerated < ExpirationDateTime
| summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url
| project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
OperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url
| extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url
kind: Scheduled
triggerOperator: gt
queryFrequency: 1h
name: TI Map URL Entity to AuditLogs
queryPeriod: 14d
id: 712fab52-2a7d-401e-a08c-ff939cc7c25e
description: |
'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in AuditLogs.'
severity: Medium
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(Url)
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
AuditLogs
| where TimeGenerated >= ago(dt_lookBack)
// Extract the URL that is contained within the JSON data
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);", 1,tostring(TargetResources))
| where isnotempty(Url)
| extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)
| extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)
| extend Audit_TimeGenerated = TimeGenerated
) on Url
| where Audit_TimeGenerated < ExpirationDateTime
| summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url
| project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,
OperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url
| extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url
version: 1.2.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_AuditLogs.yaml
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
- entityType: Host
fieldMappings:
- identifier: FullName
columnName: HostCustomEntity
- entityType: URL
fieldMappings:
- identifier: Url
columnName: URLCustomEntity
requiredDataConnectors:
- connectorId: AzureActiveDirectory
dataTypes:
- AuditLogs
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
tactics:
- Impact
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/712fab52-2a7d-401e-a08c-ff939cc7c25e')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/712fab52-2a7d-401e-a08c-ff939cc7c25e')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "TI Map URL Entity to AuditLogs",
"description": "'This query identifies any URL indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in AuditLogs.'\n",
"severity": "Medium",
"enabled": true,
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true\n// Picking up only IOC's that contain the entities we want\n| where isnotempty(Url)\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n AuditLogs\n | where TimeGenerated >= ago(dt_lookBack)\n // Extract the URL that is contained within the JSON data\n | extend Url = extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+);\", 1,tostring(TargetResources))\n | where isnotempty(Url)\n | extend userPrincipalName = tostring(parse_json(tostring(InitiatedBy.user)).userPrincipalName)\n | extend TargetResourceDisplayName = tostring(TargetResources[0].displayName)\n | extend Audit_TimeGenerated = TimeGenerated\n) on Url\n| where Audit_TimeGenerated < ExpirationDateTime\n| summarize Audit_TimeGenerated = arg_max(Audit_TimeGenerated, *) by IndicatorId, Url\n| project Audit_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore,\nOperationName, Identity, userPrincipalName, TargetResourceDisplayName, Url\n| extend timestamp = Audit_TimeGenerated, AccountCustomEntity = userPrincipalName, HostCustomEntity = TargetResourceDisplayName, URLCustomEntity = Url\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"alertRuleTemplateName": "712fab52-2a7d-401e-a08c-ff939cc7c25e",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "AccountCustomEntity"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
],
"entityType": "Host"
},
{
"fieldMappings": [
{
"identifier": "Url",
"columnName": "URLCustomEntity"
}
],
"entityType": "URL"
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_AuditLogs.yaml",
"templateVersion": "1.2.4"
}
}
]
}