TI map IP entity to AWSCloudTrail

let dt_lookBack = 1h; // Look back 1 hour for AWSCloudTrail logs
let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
// Fetch threat intelligence indicators related to IP addresses
let IP_Indicators = ThreatIntelligenceIndicator
  // Filter out indicators without relevant IP address fields
  | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
  | where TimeGenerated >= ago(ioc_lookBack)
  // Select the IP entity based on availability of different IP fields
  | 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 and filtering out specific address prefixes
  | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now();
// Perform a join between IP indicators and AWSCloudTrail logs to identify potential malicious activity
IP_Indicators
  // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
  | join kind=innerunique (
      AWSCloudTrail
      | where TimeGenerated >= ago(dt_lookBack)
      | extend AWSCloudTrail_TimeGenerated = TimeGenerated // Rename time column for clarity
    )
    on $left.TI_ipEntity == $right.SourceIpAddress
  // Filter out logs that occurred after the expiration of the corresponding indicator
  | where AWSCloudTrail_TimeGenerated < ExpirationDateTime
  // Group the results by IndicatorId and SourceIpAddress, and keep the log entry with the latest timestamp
  | summarize AWSCloudTrail_TimeGenerated = arg_max(AWSCloudTrail_TimeGenerated, *) by IndicatorId, SourceIpAddress
  // Select the desired output fields
  | project AWSCloudTrail_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
    TI_ipEntity, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserIdentityUserName, SourceIpAddress,
    NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
  // Rename the timestamp field
  | extend timestamp = AWSCloudTrail_TimeGenerated

query: |
  let dt_lookBack = 1h; // Look back 1 hour for AWSCloudTrail logs
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  // Fetch threat intelligence indicators related to IP addresses
  let IP_Indicators = ThreatIntelligenceIndicator
    // Filter out indicators without relevant IP address fields
    | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
    | where TimeGenerated >= ago(ioc_lookBack)
    // Select the IP entity based on availability of different IP fields
    | 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 and filtering out specific address prefixes
    | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now();
  // Perform a join between IP indicators and AWSCloudTrail logs to identify potential malicious activity
  IP_Indicators
    // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
    | join kind=innerunique (
        AWSCloudTrail
        | where TimeGenerated >= ago(dt_lookBack)
        | extend AWSCloudTrail_TimeGenerated = TimeGenerated // Rename time column for clarity
      )
      on $left.TI_ipEntity == $right.SourceIpAddress
    // Filter out logs that occurred after the expiration of the corresponding indicator
    | where AWSCloudTrail_TimeGenerated < ExpirationDateTime
    // Group the results by IndicatorId and SourceIpAddress, and keep the log entry with the latest timestamp
    | summarize AWSCloudTrail_TimeGenerated = arg_max(AWSCloudTrail_TimeGenerated, *) by IndicatorId, SourceIpAddress
    // Select the desired output fields
    | project AWSCloudTrail_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
      TI_ipEntity, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserIdentityUserName, SourceIpAddress,
      NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type
    // Rename the timestamp field
    | extend timestamp = AWSCloudTrail_TimeGenerated  
name: TI map IP entity to AWSCloudTrail
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
  dataTypes:
  - ThreatIntelligenceIndicator
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
- connectorId: MicrosoftDefenderThreatIntelligence
  dataTypes:
  - ThreatIntelligenceIndicator
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: ObjectGuid
    columnName: UserIdentityUserName
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: Url
description: |
    Identifies a match in AWSCloudTrail from any IP IOC from TI
kind: Scheduled
severity: Medium
triggerThreshold: 0
queryPeriod: 14d
queryFrequency: 1h
triggerOperator: gt
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AWSCloudTrail.yaml
id: f110287e-1358-490d-8147-ed804b328514
version: 1.4.1

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/f110287e-1358-490d-8147-ed804b328514')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f110287e-1358-490d-8147-ed804b328514')]",
      "properties": {
        "alertRuleTemplateName": "f110287e-1358-490d-8147-ed804b328514",
        "customDetails": null,
        "description": "Identifies a match in AWSCloudTrail from any IP IOC from TI\n",
        "displayName": "TI map IP entity to AWSCloudTrail",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserIdentityUserName",
                "identifier": "ObjectGuid"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_AWSCloudTrail.yaml",
        "query": "let dt_lookBack = 1h; // Look back 1 hour for AWSCloudTrail logs\nlet ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators\n// Fetch threat intelligence indicators related to IP addresses\nlet IP_Indicators = ThreatIntelligenceIndicator\n  // Filter out indicators without relevant IP address fields\n  | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)\n  | where TimeGenerated >= ago(ioc_lookBack)\n  // Select the IP entity based on availability of different IP fields\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 and filtering out specific address prefixes\n  | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith \"fe80\" and TI_ipEntity !startswith \"::\" and TI_ipEntity !startswith \"127.\"\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where Active == true and ExpirationDateTime > now();\n// Perform a join between IP indicators and AWSCloudTrail logs to identify potential malicious activity\nIP_Indicators\n  // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation\n  | join kind=innerunique (\n      AWSCloudTrail\n      | where TimeGenerated >= ago(dt_lookBack)\n      | extend AWSCloudTrail_TimeGenerated = TimeGenerated // Rename time column for clarity\n    )\n    on $left.TI_ipEntity == $right.SourceIpAddress\n  // Filter out logs that occurred after the expiration of the corresponding indicator\n  | where AWSCloudTrail_TimeGenerated < ExpirationDateTime\n  // Group the results by IndicatorId and SourceIpAddress, and keep the log entry with the latest timestamp\n  | summarize AWSCloudTrail_TimeGenerated = arg_max(AWSCloudTrail_TimeGenerated, *) by IndicatorId, SourceIpAddress\n  // Select the desired output fields\n  | project AWSCloudTrail_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\n    TI_ipEntity, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserIdentityUserName, SourceIpAddress,\n    NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress, Type\n  // Rename the timestamp field\n  | extend timestamp = AWSCloudTrail_TimeGenerated\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "templateVersion": "1.4.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}