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

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Id	536e8e5c-ce0e-575e-bcc9-aba8e7bf9316
Rulename	GreyNoise 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 GreyNoise IoC. This analytic rule uses ASIM and supports any built-in or custom source that supports the ASIM NetworkSession schema
Severity	Medium
Tactics	Impact
Required data connectors	AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoMeraki Corelight Fortinet GreyNoise2SentinelAPI MicrosoftDefenderThreatIntelligence MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents 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/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_imNetworkSession.yaml
Version	1.0.1
Arm template	536e8e5c-ce0e-575e-bcc9-aba8e7bf9316.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IP_TI = materialize (
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
| where SourceSystem == 'GreyNoise'
  | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
  | where TI_ipEntity != "NO_IP"
);
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

queryPeriod: 14d
kind: Scheduled
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: GreyNoise2SentinelAPI
tags:
- Schema: ASIMNetworkSession
  SchemaVersion: 0.2.4
id: 536e8e5c-ce0e-575e-bcc9-aba8e7bf9316
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IoCIP
  entityType: IP
name: GreyNoise TI map IP entity to Network Session Events (ASIM Network Session schema)
status: Available
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.
customDetails:
  ThreatType: ThreatType
  IoCExpirationTime: ExpirationDateTime
  EventStartTime: imNWS_mintime
  IoCDescription: Description
  IndicatorId: IndicatorId
  ActivityGroupNames: ActivityGroupNames
  IoCConfidenceScore: ConfidenceScore
  EventEndTime: imNWS_maxtime
  IoCIPDirection: IoCDirection
severity: Medium
queryFrequency: 1h
version: 1.0.1
description: |
  'This rule identifies a match Network Sessions for which the source or destination IP address is a known GreyNoise IoC.
  This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'  
tactics:
- Impact
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let IP_TI = materialize (
  ThreatIntelligenceIndicator
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | where Active == true and ExpirationDateTime > now()
  | where SourceSystem == 'GreyNoise'
    | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,"NO_IP")
    | where TI_ipEntity != "NO_IP"
  );
  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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_imNetworkSession.yaml
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": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/536e8e5c-ce0e-575e-bcc9-aba8e7bf9316')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/536e8e5c-ce0e-575e-bcc9-aba8e7bf9316')]",
      "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": "536e8e5c-ce0e-575e-bcc9-aba8e7bf9316",
        "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 GreyNoise IoC.\nThis analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'\n",
        "displayName": "GreyNoise 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/GreyNoiseThreatIntelligence/Analytic Rules/GreyNoise_IPEntity_imNetworkSession.yaml",
        "query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IP_TI = materialize (\nThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true and ExpirationDateTime > now()\n| where SourceSystem == 'GreyNoise'\n  | extend TI_ipEntity = coalesce(NetworkIP, NetworkDestinationIP, NetworkSourceIP,EmailSourceIpAddress,\"NO_IP\")\n  | where TI_ipEntity != \"NO_IP\"\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",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "tags": [
          {
            "Schema": "ASIMNetworkSession",
            "SchemaVersion": "0.2.4"
          }
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}