Microsoft Sentinel Analytic Rules
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  5. TI map IP entity to AzureNetworkAnalytics_CL (NSG Flow Logs)

TI map IP entity to AzureNetworkAnalytics_CL (NSG Flow Logs)

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Ida4025a76-6490-4e6b-bb69-d02be4b03f07
RulenameTI map IP entity to AzureNetworkAnalytics_CL (NSG Flow Logs)
DescriptionIdentifies a match in AzureNetworkAnalytics_CL (NSG Flow Logs) from any IP IOC from TI that was Allowed
SeverityMedium
TacticsImpact
Required data connectorsThreatIntelligence
ThreatIntelligenceTaxii
KindScheduled
Query frequency1h
Query period14d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureNetworkAnalytics.yaml
Version1.3.1
Arm templatea4025a76-6490-4e6b-bb69-d02be4b03f07.json
Deploy To Azure
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IoCList = materialize(externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True));
let IP_Indicators = (union isfuzzy=true
(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(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
// As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.
// Taking the first non-empty value based on potential IOC match availability
| extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
//Exclude local addresses, using the ipv4_is_private operator
| where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
),
(IoCList
| where IoC_Type =~ 'IP'
| where ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
| where Active =~ 'True'
| extend TI_ipEntity = IoC
| project-away  IoC_Type
)
);
IP_Indicators
// 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 (
    AzureNetworkAnalytics_CL
    | where TimeGenerated >= ago(dt_lookBack)
    // renaming time column so it is clear the log this came from
    | extend AzureNetworkAnalytics_CL_TimeGenerated = TimeGenerated
    // NSG Flow Logs have additional information concat with Public IP, removing onlp Public IP
    | extend PIPs = split(PublicIPs_s, '|', 0)
    | extend PIP = tostring(PIPs[0])
)
on $left.TI_ipEntity == $right.PIP
| where AzureNetworkAnalytics_CL_TimeGenerated < ExpirationDateTime
| summarize AzureNetworkAnalytics_CL_TimeGenerated = arg_max(AzureNetworkAnalytics_CL_TimeGenerated, *) by IndicatorId, PIP, IoC
// Set to alert on Allowed NSG Flows from TI Public IP IOC
| where FlowStatus_s == "A"
| project AzureNetworkAnalytics_CL_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
TI_ipEntity, Computer, FlowDirection_s, FlowStatus_s, FlowType_s, SrcPublicIPs_s, DestPublicIPs_s, PublicIPs_s, L7Protocol_s, DestPort_d, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
| extend timestamp = AzureNetworkAnalytics_CL_TimeGenerated, IPCustomEntity = TI_ipEntity, HostCustomEntity = Computer, URLCustomEntity = Url

triggerOperator: gt
id: a4025a76-6490-4e6b-bb69-d02be4b03f07
queryFrequency: 1h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: HostCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
- entityType: URL
  fieldMappings:
  - columnName: URLCustomEntity
    identifier: Url
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
severity: Medium
triggerThreshold: 0
kind: Scheduled
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureNetworkAnalytics.yaml
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let IoCList = materialize(externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True));
  let IP_Indicators = (union isfuzzy=true
  (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(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
  // As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.
  // Taking the first non-empty value based on potential IOC match availability
  | extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)
  //Exclude local addresses, using the ipv4_is_private operator
  | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
  ),
  (IoCList
  | where IoC_Type =~ 'IP'
  | where ExpirationDateTime > now()
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
  | where Active =~ 'True'
  | extend TI_ipEntity = IoC
  | project-away  IoC_Type
  )
  );
  IP_Indicators
  // 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 (
      AzureNetworkAnalytics_CL
      | where TimeGenerated >= ago(dt_lookBack)
      // renaming time column so it is clear the log this came from
      | extend AzureNetworkAnalytics_CL_TimeGenerated = TimeGenerated
      // NSG Flow Logs have additional information concat with Public IP, removing onlp Public IP
      | extend PIPs = split(PublicIPs_s, '|', 0)
      | extend PIP = tostring(PIPs[0])
  )
  on $left.TI_ipEntity == $right.PIP
  | where AzureNetworkAnalytics_CL_TimeGenerated < ExpirationDateTime
  | summarize AzureNetworkAnalytics_CL_TimeGenerated = arg_max(AzureNetworkAnalytics_CL_TimeGenerated, *) by IndicatorId, PIP, IoC
  // Set to alert on Allowed NSG Flows from TI Public IP IOC
  | where FlowStatus_s == "A"
  | project AzureNetworkAnalytics_CL_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
  TI_ipEntity, Computer, FlowDirection_s, FlowStatus_s, FlowType_s, SrcPublicIPs_s, DestPublicIPs_s, PublicIPs_s, L7Protocol_s, DestPort_d, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
  | extend timestamp = AzureNetworkAnalytics_CL_TimeGenerated, IPCustomEntity = TI_ipEntity, HostCustomEntity = Computer, URLCustomEntity = Url  
description: |
    'Identifies a match in AzureNetworkAnalytics_CL (NSG Flow Logs) from any IP IOC from TI that was Allowed'
name: TI map IP entity to AzureNetworkAnalytics_CL (NSG Flow Logs)
tactics:
- Impact
version: 1.3.1

{
  "$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/a4025a76-6490-4e6b-bb69-d02be4b03f07')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a4025a76-6490-4e6b-bb69-d02be4b03f07')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "TI map IP entity to AzureNetworkAnalytics_CL (NSG Flow Logs)",
        "description": "'Identifies a match in AzureNetworkAnalytics_CL (NSG Flow Logs) from any IP IOC from TI that was Allowed'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IoCList = materialize(externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@\"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv\"] with(format=\"csv\", ignoreFirstRecord=True));\nlet IP_Indicators = (union isfuzzy=true\n(ThreatIntelligenceIndicator\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(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)\n// As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.\n// Taking the first non-empty value based on potential IOC match availability\n| extend TI_ipEntity = iff(isnotempty(NetworkIP), NetworkIP, NetworkDestinationIP)\n| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)\n| extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(EmailSourceIpAddress), EmailSourceIpAddress, TI_ipEntity)\n//Exclude local addresses, using the ipv4_is_private operator\n| where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith \"fe80\" and TI_ipEntity !startswith \"::\" and TI_ipEntity !startswith \"127.\"\n),\n(IoCList\n| where IoC_Type =~ 'IP'\n| where ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC\n| where Active =~ 'True'\n| extend TI_ipEntity = IoC\n| project-away  IoC_Type\n)\n);\nIP_Indicators\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    AzureNetworkAnalytics_CL\n    | where TimeGenerated >= ago(dt_lookBack)\n    // renaming time column so it is clear the log this came from\n    | extend AzureNetworkAnalytics_CL_TimeGenerated = TimeGenerated\n    // NSG Flow Logs have additional information concat with Public IP, removing onlp Public IP\n    | extend PIPs = split(PublicIPs_s, '|', 0)\n    | extend PIP = tostring(PIPs[0])\n)\non $left.TI_ipEntity == $right.PIP\n| where AzureNetworkAnalytics_CL_TimeGenerated < ExpirationDateTime\n| summarize AzureNetworkAnalytics_CL_TimeGenerated = arg_max(AzureNetworkAnalytics_CL_TimeGenerated, *) by IndicatorId, PIP, IoC\n// Set to alert on Allowed NSG Flows from TI Public IP IOC\n| where FlowStatus_s == \"A\"\n| project AzureNetworkAnalytics_CL_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\nTI_ipEntity, Computer, FlowDirection_s, FlowStatus_s, FlowType_s, SrcPublicIPs_s, DestPublicIPs_s, PublicIPs_s, L7Protocol_s, DestPort_d, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type\n| extend timestamp = AzureNetworkAnalytics_CL_TimeGenerated, IPCustomEntity = TI_ipEntity, HostCustomEntity = Computer, URLCustomEntity = Url\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "alertRuleTemplateName": "a4025a76-6490-4e6b-bb69-d02be4b03f07",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "HostCustomEntity"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "URLCustomEntity"
              }
            ],
            "entityType": "URL"
          }
        ],
        "templateVersion": "1.3.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AzureNetworkAnalytics.yaml"
      }
    }
  ]
}