TI map IP entity to Network Session Events ASIM Network Session schema

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Id	e2399891-383c-4caf-ae67-68a008b9f89e
Rulename	TI map IP entity to Network Session Events (ASIM Network Session schema)
Description	This rule identifies a match Network Sessions for which the source or destination IP address is a known IoC. This analytic rule uses ASIM and supports any built-in or custom source that supports the ASIM NetworkSession schema
Severity	Medium
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoMeraki Corelight Fortinet MicrosoftDefenderThreatIntelligence MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents ThreatIntelligenceTaxii WindowsForwardedEvents Zscaler
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/IPEntity_imNetworkSession.yaml
Version	1.2.6
Arm template	e2399891-383c-4caf-ae67-68a008b9f89e.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = materialize (
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
  | where TI_ipEntity != "NO_IP"
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
);
IP_TI
  // 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 
(
  _Im_NetworkSession (starttime=ago(dt_lookBack))
  | where isnotempty(SrcIpAddr)
  | summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor  
  | lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity
  | project-rename SrcMatch = Active
  | lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity
  | project-rename DstMatch = Active
  | where SrcMatch or DstMatch
  | extend 
      IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),
      IoCDirection = iff(SrcMatch, "Source", "Destination")
)on $left.TI_ipEntity == $right.IoCIP
| where imNWS_mintime < ExpirationDateTime
| project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct

YAML

relevantTechniques:
- T1071
name: TI map IP entity to Network Session Events (ASIM Network Session schema)
requiredDataConnectors:
- dataTypes:
  - AWSVPCFlow
  connectorId: AWSS3
- dataTypes:
  - DeviceNetworkEvents
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - WindowsEvent
  connectorId: WindowsForwardedEvents
- dataTypes:
  - CommonSecurityLog
  connectorId: Zscaler
- dataTypes:
  - Syslog
  connectorId: MicrosoftSysmonForLinux
- dataTypes:
  - CommonSecurityLog
  connectorId: PaloAltoNetworks
- dataTypes:
  - VMConnection
  connectorId: AzureMonitor(VMInsights)
- dataTypes:
  - AzureDiagnostics
  connectorId: AzureFirewall
- dataTypes:
  - AzureDiagnostics
  connectorId: AzureNSG
- dataTypes:
  - CommonSecurityLog
  connectorId: CiscoASA
- dataTypes:
  - Corelight_CL
  connectorId: Corelight
- dataTypes:
  - VectraStream
  connectorId: AIVectraStream
- dataTypes:
  - CommonSecurityLog
  connectorId: CheckPoint
- dataTypes:
  - CommonSecurityLog
  connectorId: Fortinet
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: MicrosoftDefenderThreatIntelligence
- dataTypes:
  - Syslog
  - CiscoMerakiNativePoller
  connectorId: CiscoMeraki
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IoCIP
  entityType: IP
triggerThreshold: 0
id: e2399891-383c-4caf-ae67-68a008b9f89e
tactics:
- CommandAndControl
version: 1.2.6
customDetails:
  IndicatorId: IndicatorId
  ThreatType: ThreatType
  EventEndTime: imNWS_maxtime
  ActivityGroupNames: ActivityGroupNames
  EventStartTime: imNWS_mintime
  IoCDescription: Description
  IoCConfidenceScore: ConfidenceScore
  IoCIPDirection: IoCDirection
  IoCExpirationTime: ExpirationDateTime
alertDetailsOverride:
  alertDisplayNameFormat: A network session {{IoCDirection}} address {{IoCIP}} matched an IoC.
  alertDescriptionFormat: The {{IoCDirection}} address {{IoCIP}} of a network session  matched a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence blead for more information on the indicator.
queryPeriod: 14d
kind: Scheduled
tags:
- Schema: ASIMNetworkSession
  SchemaVersion: 0.2.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_imNetworkSession.yaml
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'This rule identifies a match Network Sessions for which the source or destination IP address is a known IoC. This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let IP_TI = materialize (
    ThreatIntelligenceIndicator
    | where TimeGenerated >= ago(ioc_lookBack)
    | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
    | where TI_ipEntity != "NO_IP"
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
    | where Active == true and ExpirationDateTime > now()
  );
  IP_TI
    // 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 
  (
    _Im_NetworkSession (starttime=ago(dt_lookBack))
    | where isnotempty(SrcIpAddr)
    | summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor  
    | lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity
    | project-rename SrcMatch = Active
    | lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity
    | project-rename DstMatch = Active
    | where SrcMatch or DstMatch
    | extend 
        IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),
        IoCDirection = iff(SrcMatch, "Source", "Destination")
  )on $left.TI_ipEntity == $right.IoCIP
  | where imNWS_mintime < ExpirationDateTime
  | project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct  
triggerOperator: gt

ARM

{
  "$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/e2399891-383c-4caf-ae67-68a008b9f89e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e2399891-383c-4caf-ae67-68a008b9f89e')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "The {{IoCDirection}} address {{IoCIP}} of a network session  matched a known indicator of compromise of {{ThreatType}}. Consult the threat intelligence blead for more information on the indicator.",
          "alertDisplayNameFormat": "A network session {{IoCDirection}} address {{IoCIP}} matched an IoC."
        },
        "alertRuleTemplateName": "e2399891-383c-4caf-ae67-68a008b9f89e",
        "customDetails": {
          "ActivityGroupNames": "ActivityGroupNames",
          "EventEndTime": "imNWS_maxtime",
          "EventStartTime": "imNWS_mintime",
          "IndicatorId": "IndicatorId",
          "IoCConfidenceScore": "ConfidenceScore",
          "IoCDescription": "Description",
          "IoCExpirationTime": "ExpirationDateTime",
          "IoCIPDirection": "IoCDirection",
          "ThreatType": "ThreatType"
        },
        "description": "'This rule identifies a match Network Sessions for which the source or destination IP address is a known IoC. This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'\n",
        "displayName": "TI map IP entity to Network Session Events (ASIM Network Session schema)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IoCIP",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/IPEntity_imNetworkSession.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IP_TI = materialize (\n  ThreatIntelligenceIndicator\n  | where TimeGenerated >= ago(ioc_lookBack)\n  | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,\"NO_IP\")\n  | where TI_ipEntity != \"NO_IP\"\n  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n  | where Active == true and ExpirationDateTime > now()\n);\nIP_TI\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(\n  _Im_NetworkSession (starttime=ago(dt_lookBack))\n  | where isnotempty(SrcIpAddr)\n  | summarize imNWS_mintime=min(TimeGenerated), imNWS_maxtime=max(TimeGenerated) by SrcIpAddr, DstIpAddr, Dvc, EventProduct, EventVendor  \n  | lookup (IP_TI | project TI_ipEntity, Active) on $left.SrcIpAddr == $right.TI_ipEntity\n  | project-rename SrcMatch = Active\n  | lookup (IP_TI | project TI_ipEntity, Active) on $left.DstIpAddr == $right.TI_ipEntity\n  | project-rename DstMatch = Active\n  | where SrcMatch or DstMatch\n  | extend \n      IoCIP = iff(SrcMatch, SrcIpAddr, DstIpAddr),\n      IoCDirection = iff(SrcMatch, \"Source\", \"Destination\")\n)on $left.TI_ipEntity == $right.IoCIP\n| where imNWS_mintime < ExpirationDateTime\n| project imNWS_mintime, imNWS_maxtime, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SrcIpAddr, DstIpAddr, IoCDirection, IoCIP, Dvc, EventVendor, EventProduct\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "tags": [
          {
            "Schema": "ASIMNetworkSession",
            "SchemaVersion": "0.2.4"
          }
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.2.6",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}