TI map URL entity to SecurityAlert data
Id | f30a47c1-65fb-42b1-a7f4-00941c12550b |
Rulename | TI map URL entity to SecurityAlert data |
Description | Identifies a match in SecurityAlert data from any URL IOC from TI |
Severity | Medium |
Tactics | Impact |
Required data connectors | AzureSecurityCenter MicrosoftCloudAppSecurity 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_SecurityAlerts.yaml |
Version | 1.2.3 |
Arm template | f30a47c1-65fb-42b1-a7f4-00941c12550b.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 (
SecurityAlert
| where TimeGenerated >= ago(dt_lookBack)
| extend MSTI = case(AlertName has "TI map" and VendorName == "Microsoft" and ProductName == 'Azure Sentinel', true, false)
| where MSTI == false
// Extract URL from JSON data
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1,Entities)
// We only want alerts that actually contain URL data
| where isnotempty(Url)
// Extract hostname from JSON data for entity mapping
| extend Compromised_Host = tostring(parse_json(ExtendedProperties).["Compromised Host"])
| extend Alert_TimeGenerated = TimeGenerated
) on Url
| where Alert_TimeGenerated < ExpirationDateTime
| summarize Alert_TimeGenerated = arg_max(Alert_TimeGenerated, *) by IndicatorId, AlertName
| project Alert_TimeGenerated, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, AlertName, AlertSeverity, Description, Url, Compromised_Host
| extend timestamp = Alert_TimeGenerated, HostCustomEntity = Compromised_Host, URLCustomEntity = Url
version: 1.2.3
queryFrequency: 1h
requiredDataConnectors:
- connectorId: MicrosoftCloudAppSecurity
dataTypes:
- SecurityAlert
- connectorId: AzureSecurityCenter
dataTypes:
- SecurityAlert
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
entityMappings:
- fieldMappings:
- columnName: HostCustomEntity
identifier: FullName
entityType: Host
- fieldMappings:
- columnName: URLCustomEntity
identifier: Url
entityType: URL
kind: Scheduled
queryPeriod: 14d
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 (
SecurityAlert
| where TimeGenerated >= ago(dt_lookBack)
| extend MSTI = case(AlertName has "TI map" and VendorName == "Microsoft" and ProductName == 'Azure Sentinel', true, false)
| where MSTI == false
// Extract URL from JSON data
| extend Url = extract("(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)", 1,Entities)
// We only want alerts that actually contain URL data
| where isnotempty(Url)
// Extract hostname from JSON data for entity mapping
| extend Compromised_Host = tostring(parse_json(ExtendedProperties).["Compromised Host"])
| extend Alert_TimeGenerated = TimeGenerated
) on Url
| where Alert_TimeGenerated < ExpirationDateTime
| summarize Alert_TimeGenerated = arg_max(Alert_TimeGenerated, *) by IndicatorId, AlertName
| project Alert_TimeGenerated, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, AlertName, AlertSeverity, Description, Url, Compromised_Host
| extend timestamp = Alert_TimeGenerated, HostCustomEntity = Compromised_Host, URLCustomEntity = Url
triggerOperator: gt
id: f30a47c1-65fb-42b1-a7f4-00941c12550b
description: |
'Identifies a match in SecurityAlert data from any URL IOC from TI'
triggerThreshold: 0
name: TI map URL entity to SecurityAlert data
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_SecurityAlerts.yaml
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/f30a47c1-65fb-42b1-a7f4-00941c12550b')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f30a47c1-65fb-42b1-a7f4-00941c12550b')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "TI map URL entity to SecurityAlert data",
"description": "'Identifies a match in SecurityAlert data from any URL IOC from TI'\n",
"severity": "Medium",
"enabled": true,
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true\n// Picking up only IOC's that contain the entities we want\n| where isnotempty(Url)\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n SecurityAlert\n | where TimeGenerated >= ago(dt_lookBack)\n | extend MSTI = case(AlertName has \"TI map\" and VendorName == \"Microsoft\" and ProductName == 'Azure Sentinel', true, false)\n | where MSTI == false\n // Extract URL from JSON data\n | extend Url = extract(\"(http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\\\(\\\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+)\", 1,Entities)\n // We only want alerts that actually contain URL data\n | where isnotempty(Url)\n // Extract hostname from JSON data for entity mapping\n | extend Compromised_Host = tostring(parse_json(ExtendedProperties).[\"Compromised Host\"])\n | extend Alert_TimeGenerated = TimeGenerated\n) on Url\n| where Alert_TimeGenerated < ExpirationDateTime\n| summarize Alert_TimeGenerated = arg_max(Alert_TimeGenerated, *) by IndicatorId, AlertName\n| project Alert_TimeGenerated, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, AlertName, AlertSeverity, Description, Url, Compromised_Host\n| extend timestamp = Alert_TimeGenerated, HostCustomEntity = Compromised_Host, URLCustomEntity = Url\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"alertRuleTemplateName": "f30a47c1-65fb-42b1-a7f4-00941c12550b",
"customDetails": null,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"identifier": "Url",
"columnName": "URLCustomEntity"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/URLEntity_SecurityAlerts.yaml",
"templateVersion": "1.2.3"
}
}
]
}