Detection of Malware C2 IPs in Azure Act Events

// Identifies a match in AzureActivity from the Recorded Future C2 Malware Detection IPs (Actively Communicating C&C Server RiskList)
let dt_lookBack = 1h;
let ioc_lookBack = 1d;
ThreatIntelligenceIndicator
// Picking up only Recorded Future IOC's that are pertinent to the use case (Malware C2 Detection)
| where Description == "Recorded Future - IP - Actively Communicating C&C Server"
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| where Active == true
| extend TI_ipEntity = NetworkIP
| join (
  AzureActivity | where TimeGenerated >= ago(dt_lookBack)
  // renaming time column so it is clear the log this came from
  | extend AzureActivity_TimeGenerated = TimeGenerated
  )
on $left.TI_ipEntity == $right.CallerIpAddress
| where AzureActivity_TimeGenerated >= TimeGenerated and AzureActivity_TimeGenerated < ExpirationDateTime
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| project LatestIndicatorTime, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, AzureActivity_TimeGenerated, TI_ipEntity, CallerIpAddress, Caller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, Description, AdditionalInformation
| extend AccountName = tostring(split(Caller, "@")[0]), AccountUPNSuffix = tostring(split(Caller, "@")[1])

relevantTechniques:
- T1071
name: Detection of Malware C2 IPs in Azure Act. Events
requiredDataConnectors:
- dataTypes:
  - AzureActivity
  connectorId: AzureActivity
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Caller
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: CallerIpAddress
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: Url
  entityType: URL
- fieldMappings:
  - identifier: Address
    columnName: TI_ipEntity
  entityType: IP
triggerThreshold: 0
id: 588dc717-7583-452c-a743-dee96705898e
tactics:
- CommandAndControl
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Recorded Future/Analytic Rules/RecordedFutureIPMalwareC2inAzureActivityEvents.yaml
queryPeriod: 1d
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'Identifies a match in Azure Activity Events from Recorded Future Actively Communicating C&C Server Risklist.'
query: |
  // Identifies a match in AzureActivity from the Recorded Future C2 Malware Detection IPs (Actively Communicating C&C Server RiskList)
  let dt_lookBack = 1h;
  let ioc_lookBack = 1d;
  ThreatIntelligenceIndicator
  // Picking up only Recorded Future IOC's that are pertinent to the use case (Malware C2 Detection)
  | where Description == "Recorded Future - IP - Actively Communicating C&C Server"
  | where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
  | where Active == true
  | extend TI_ipEntity = NetworkIP
  | join (
    AzureActivity | where TimeGenerated >= ago(dt_lookBack)
    // renaming time column so it is clear the log this came from
    | extend AzureActivity_TimeGenerated = TimeGenerated
    )
  on $left.TI_ipEntity == $right.CallerIpAddress
  | where AzureActivity_TimeGenerated >= TimeGenerated and AzureActivity_TimeGenerated < ExpirationDateTime
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
  | project LatestIndicatorTime, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, AzureActivity_TimeGenerated, TI_ipEntity, CallerIpAddress, Caller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, Description, AdditionalInformation
  | extend AccountName = tostring(split(Caller, "@")[0]), AccountUPNSuffix = tostring(split(Caller, "@")[1])  
triggerOperator: gt

{
  "$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/588dc717-7583-452c-a743-dee96705898e')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/588dc717-7583-452c-a743-dee96705898e')]",
      "properties": {
        "alertRuleTemplateName": "588dc717-7583-452c-a743-dee96705898e",
        "customDetails": null,
        "description": "'Identifies a match in Azure Activity Events from Recorded Future Actively Communicating C&C Server Risklist.'\n",
        "displayName": "Detection of Malware C2 IPs in Azure Act. Events",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Caller",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CallerIpAddress",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "Url",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "TI_ipEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Recorded Future/Analytic Rules/RecordedFutureIPMalwareC2inAzureActivityEvents.yaml",
        "query": "// Identifies a match in AzureActivity from the Recorded Future C2 Malware Detection IPs (Actively Communicating C&C Server RiskList)\nlet dt_lookBack = 1h;\nlet ioc_lookBack = 1d;\nThreatIntelligenceIndicator\n// Picking up only Recorded Future IOC's that are pertinent to the use case (Malware C2 Detection)\n| where Description == \"Recorded Future - IP - Actively Communicating C&C Server\"\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| where Active == true\n| extend TI_ipEntity = NetworkIP\n| join (\n  AzureActivity | where TimeGenerated >= ago(dt_lookBack)\n  // renaming time column so it is clear the log this came from\n  | extend AzureActivity_TimeGenerated = TimeGenerated\n  )\non $left.TI_ipEntity == $right.CallerIpAddress\n| where AzureActivity_TimeGenerated >= TimeGenerated and AzureActivity_TimeGenerated < ExpirationDateTime\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| project LatestIndicatorTime, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore, AzureActivity_TimeGenerated, TI_ipEntity, CallerIpAddress, Caller, OperationNameValue, ActivityStatusValue, CategoryValue, ResourceId, NetworkIP, Description, AdditionalInformation\n| extend AccountName = tostring(split(Caller, \"@\")[0]), AccountUPNSuffix = tostring(split(Caller, \"@\")[1])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}