TI map IP entity to GitHub_CL

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Id	aac495a9-feb1-446d-b08e-a1164a539452
Rulename	TI map IP entity to GitHub_CL
Description	Identifies a match in GitHub_CL table from any IP IOC from TI
Severity	Medium
Tactics	Impact
Required data connectors	ThreatIntelligence ThreatIntelligenceTaxii
Kind	Scheduled
Query frequency	1h
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Detections/GitHub/Threat Intel Matches to GitHub Audit Logs.yaml
Version	1.0.1
Arm template	aac495a9-feb1-446d-b08e-a1164a539452.json

KQL

ThreatIntelligenceIndicator
| where Action == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
// 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)
| join (
  GitHubAudit
  | extend GitHubAudit_TimeGenerated = TimeGenerated
)
on $left.TI_ipEntity == $right.IPaddress
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, GitHubAudit_TimeGenerated, TI_ipEntity, IPaddress, Actor, Action, Country, OperationType, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress
| extend timestamp = GitHubAudit_TimeGenerated, IPCustomEntity = IPaddress, AccountCustomEntity = Actor

YAML

triggerOperator: gt
id: aac495a9-feb1-446d-b08e-a1164a539452
queryFrequency: 1h
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
requiredDataConnectors:
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelligenceIndicator
  connectorId: ThreatIntelligenceTaxii
severity: Medium
triggerThreshold: 0
kind: Scheduled
queryPeriod: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/GitHub/Threat Intel Matches to GitHub Audit Logs.yaml
query: |
  ThreatIntelligenceIndicator
  | where Action == true
  // Picking up only IOC's that contain the entities we want
  | where isnotempty(NetworkIP) or isnotempty(EmailSourceIpAddress) or isnotempty(NetworkDestinationIP) or isnotempty(NetworkSourceIP)
  // 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)
  | join (
    GitHubAudit
    | extend GitHubAudit_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.IPaddress
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, GitHubAudit_TimeGenerated, TI_ipEntity, IPaddress, Actor, Action, Country, OperationType, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress
  | extend timestamp = GitHubAudit_TimeGenerated, IPCustomEntity = IPaddress, AccountCustomEntity = Actor  
description: |
    'Identifies a match in GitHub_CL table from any IP IOC from TI'
name: TI map IP entity to GitHub_CL
tactics:
- Impact
version: 1.0.1

ARM

{
  "$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/aac495a9-feb1-446d-b08e-a1164a539452')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/aac495a9-feb1-446d-b08e-a1164a539452')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "TI map IP entity to GitHub_CL",
        "description": "'Identifies a match in GitHub_CL table from any IP IOC from TI'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "ThreatIntelligenceIndicator\n| where Action == 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// 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| join (\n  GitHubAudit\n  | extend GitHubAudit_TimeGenerated = TimeGenerated\n)\non $left.TI_ipEntity == $right.IPaddress\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| project LatestIndicatorTime, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, GitHubAudit_TimeGenerated, TI_ipEntity, IPaddress, Actor, Action, Country, OperationType, NetworkIP, NetworkDestinationIP, NetworkSourceIP, EmailSourceIpAddress\n| extend timestamp = GitHubAudit_TimeGenerated, IPCustomEntity = IPaddress, AccountCustomEntity = Actor\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "alertRuleTemplateName": "aac495a9-feb1-446d-b08e-a1164a539452",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/GitHub/Threat Intel Matches to GitHub Audit Logs.yaml"
      }
    }
  ]
}