TI map Domain entity to PaloAlto
| Id | ec21493c-2684-4acd-9bc2-696dbad72426 |
| Rulename | TI map Domain entity to PaloAlto |
| Description | Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI |
| Severity | Medium |
| Tactics | CommandAndControl |
| Techniques | T1071 |
| Required data connectors | MicrosoftDefenderThreatIntelligence PaloAltoNetworks 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/DomainEntity_PaloAlto.yaml |
| Version | 1.4.2 |
| Arm template | ec21493c-2684-4acd-9bc2-696dbad72426.json |
let dt_lookBack = 1h; // Duration to look back for recent logs (1 hour)
let ioc_lookBack = 14d; // Duration to look back for recent threat intelligence indicators (14 days)
// Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains
let list_tlds =
ThreatIntelligenceIndicator
| where isnotempty(DomainName)
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| extend DomainName = tolower(DomainName)
| extend parts = split(DomainName, '.')
| extend tld = parts[(array_length(parts)-1)]
| summarize count() by tostring(tld)
| summarize make_list(tld);
let Domain_Indicators =
ThreatIntelligenceIndicator
// Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)
| where isnotempty(DomainName)
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| extend TI_DomainEntity = DomainName;
Domain_Indicators
// Join with CommonSecurityLog to find potential malicious activity
| join kind=innerunique (
CommonSecurityLog
| extend IngestionTime = ingestion_time()
| where IngestionTime > ago(dt_lookBack)
| where DeviceVendor =~ 'Palo Alto Networks'
| where DeviceEventClassID =~ 'url'
// Uncomment the line below to only alert on allowed connections
// | where DeviceAction !~ "block-url"
// Extract domain from RequestURL, if not present, extract it from AdditionalExtensions
| extend PA_Url = coalesce(RequestURL, "None")
| extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith "PanOS", extract("([^\"]+)", 1, tolower(AdditionalExtensions)), trim('"', PA_Url))
| extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "http://" and PA_Url !startswith "https://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), PA_Url)
| extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "https://" and ApplicationProtocol =~ "ssl", strcat('https://', PA_Url), PA_Url)
| extend Domain = trim(@"""", tostring(parse_url(PA_Url).Host))
| where isnotempty(Domain)
| extend Domain = tolower(Domain)
| extend parts = split(Domain, '.')
// Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on
| extend tld = parts[(array_length(parts)-1)]
// Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match
| where tld in~ (list_tlds)
| extend CommonSecurityLog_TimeGenerated = TimeGenerated
) on $left.TI_DomainEntity == $right.Domain
| where CommonSecurityLog_TimeGenerated < ExpirationDateTime
// Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain
// Select the desired fields for the final result set
| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
// Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value
| extend timestamp = CommonSecurityLog_TimeGenerated
tactics:
- CommandAndControl
relevantTechniques:
- T1071
id: ec21493c-2684-4acd-9bc2-696dbad72426
severity: Medium
query: |
let dt_lookBack = 1h; // Duration to look back for recent logs (1 hour)
let ioc_lookBack = 14d; // Duration to look back for recent threat intelligence indicators (14 days)
// Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains
let list_tlds =
ThreatIntelligenceIndicator
| where isnotempty(DomainName)
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| extend DomainName = tolower(DomainName)
| extend parts = split(DomainName, '.')
| extend tld = parts[(array_length(parts)-1)]
| summarize count() by tostring(tld)
| summarize make_list(tld);
let Domain_Indicators =
ThreatIntelligenceIndicator
// Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)
| where isnotempty(DomainName)
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| extend TI_DomainEntity = DomainName;
Domain_Indicators
// Join with CommonSecurityLog to find potential malicious activity
| join kind=innerunique (
CommonSecurityLog
| extend IngestionTime = ingestion_time()
| where IngestionTime > ago(dt_lookBack)
| where DeviceVendor =~ 'Palo Alto Networks'
| where DeviceEventClassID =~ 'url'
// Uncomment the line below to only alert on allowed connections
// | where DeviceAction !~ "block-url"
// Extract domain from RequestURL, if not present, extract it from AdditionalExtensions
| extend PA_Url = coalesce(RequestURL, "None")
| extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith "PanOS", extract("([^\"]+)", 1, tolower(AdditionalExtensions)), trim('"', PA_Url))
| extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "http://" and PA_Url !startswith "https://" and ApplicationProtocol !~ "ssl", strcat('http://', PA_Url), PA_Url)
| extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith "https://" and ApplicationProtocol =~ "ssl", strcat('https://', PA_Url), PA_Url)
| extend Domain = trim(@"""", tostring(parse_url(PA_Url).Host))
| where isnotempty(Domain)
| extend Domain = tolower(Domain)
| extend parts = split(Domain, '.')
// Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on
| extend tld = parts[(array_length(parts)-1)]
// Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match
| where tld in~ (list_tlds)
| extend CommonSecurityLog_TimeGenerated = TimeGenerated
) on $left.TI_DomainEntity == $right.Domain
| where CommonSecurityLog_TimeGenerated < ExpirationDateTime
// Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain
// Select the desired fields for the final result set
| project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity
// Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value
| extend timestamp = CommonSecurityLog_TimeGenerated
requiredDataConnectors:
- connectorId: PaloAltoNetworks
dataTypes:
- CommonSecurityLog
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
queryPeriod: 14d
entityMappings:
- entityType: Host
fieldMappings:
- identifier: HostName
columnName: DeviceName
- entityType: IP
fieldMappings:
- identifier: Address
columnName: SourceIP
- entityType: URL
fieldMappings:
- identifier: Url
columnName: PA_Url
triggerOperator: gt
triggerThreshold: 0
description: |
'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'
version: 1.4.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_PaloAlto.yaml
queryFrequency: 1h
name: TI map Domain entity to PaloAlto
kind: Scheduled
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/ec21493c-2684-4acd-9bc2-696dbad72426')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ec21493c-2684-4acd-9bc2-696dbad72426')]",
"properties": {
"alertRuleTemplateName": "ec21493c-2684-4acd-9bc2-696dbad72426",
"customDetails": null,
"description": "'Identifies a match in Palo Alto data in CommonSecurityLog table from any Domain IOC from TI'\n",
"displayName": "TI map Domain entity to PaloAlto",
"enabled": true,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DeviceName",
"identifier": "HostName"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIP",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "PA_Url",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_PaloAlto.yaml",
"query": "let dt_lookBack = 1h; // Duration to look back for recent logs (1 hour)\nlet ioc_lookBack = 14d; // Duration to look back for recent threat intelligence indicators (14 days)\n// Create a list of top-level domains (TLDs) in our threat feed for later validation of extracted domains\nlet list_tlds = \n ThreatIntelligenceIndicator\n | where isnotempty(DomainName)\n | where TimeGenerated >= ago(ioc_lookBack)\n | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n | where Active == true and ExpirationDateTime > now()\n | extend DomainName = tolower(DomainName)\n | extend parts = split(DomainName, '.')\n | extend tld = parts[(array_length(parts)-1)]\n | summarize count() by tostring(tld)\n | summarize make_list(tld);\nlet Domain_Indicators = \n ThreatIntelligenceIndicator\n // Filter to pick up only IOC's that contain the entities we want (in this case, DomainName)\n | where isnotempty(DomainName)\n | where TimeGenerated >= ago(ioc_lookBack)\n | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n | where Active == true and ExpirationDateTime > now()\n | extend TI_DomainEntity = DomainName;\nDomain_Indicators\n // Join with CommonSecurityLog to find potential malicious activity\n | join kind=innerunique (\n CommonSecurityLog\n | extend IngestionTime = ingestion_time()\n | where IngestionTime > ago(dt_lookBack)\n | where DeviceVendor =~ 'Palo Alto Networks'\n | where DeviceEventClassID =~ 'url'\n // Uncomment the line below to only alert on allowed connections\n // | where DeviceAction !~ \"block-url\"\n // Extract domain from RequestURL, if not present, extract it from AdditionalExtensions\n | extend PA_Url = coalesce(RequestURL, \"None\")\n | extend PA_Url = iif(isempty(PA_Url) and AdditionalExtensions !startswith \"PanOS\", extract(\"([^\\\"]+)\", 1, tolower(AdditionalExtensions)), trim('\"', PA_Url))\n | extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith \"http://\" and PA_Url !startswith \"https://\" and ApplicationProtocol !~ \"ssl\", strcat('http://', PA_Url), PA_Url)\n | extend PA_Url = iif(PA_Url !in~ ('None', 'http://None', 'https://None') and PA_Url !startswith \"https://\" and ApplicationProtocol =~ \"ssl\", strcat('https://', PA_Url), PA_Url)\n | extend Domain = trim(@\"\"\"\", tostring(parse_url(PA_Url).Host))\n | where isnotempty(Domain)\n | extend Domain = tolower(Domain)\n | extend parts = split(Domain, '.')\n // Split out the top-level domain (TLD) for the purpose of checking if we have any TI indicators with this TLD to match on\n | extend tld = parts[(array_length(parts)-1)]\n // Validate parsed domain by checking TLD against TLDs from the threat feed and drop domains where there is no chance of a match\n | where tld in~ (list_tlds)\n | extend CommonSecurityLog_TimeGenerated = TimeGenerated\n ) on $left.TI_DomainEntity == $right.Domain\n | where CommonSecurityLog_TimeGenerated < ExpirationDateTime\n // Group the results by IndicatorId and Domain and keep only the latest CommonSecurityLog_TimeGenerated\n | summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by IndicatorId, Domain\n // Select the desired fields for the final result set\n | project CommonSecurityLog_TimeGenerated, Description, ActivityGroupNames, PA_Url, Domain, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, DeviceAction, DestinationIP, DestinationPort, DeviceName, SourceIP, SourcePort, ApplicationProtocol, RequestMethod, Type, TI_DomainEntity\n // Add a new field 'timestamp' for convenience, using the CommonSecurityLog_TimeGenerated as its value\n | extend timestamp = CommonSecurityLog_TimeGenerated\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.4.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}