Whisper Security - C2 Communication Detection

// MITRE ATT&CK: T1071 - Application Layer Protocol
// Tactic: Command and Control
// Detects C2 communication by correlating network logs with Whisper threat intel
let timeRange = 1h;
let threatThreshold = 60;
let c2Indicators = WhisperThreatIntel_CL
    | where TimeGenerated > ago(timeRange)
    | where isC2 == true
    | where threatScore > threatThreshold
    | project indicator, threatScore, threatLevel, feedNames, explanation, lastSeen;
let CommonSecurityLogSafe = union isfuzzy=true CommonSecurityLog, (datatable(TimeGenerated:datetime, DestinationIP:string, DestinationHostName:string, SourceIP:string, DeviceProduct:string, DeviceAction:string)[]);
CommonSecurityLogSafe
    | where TimeGenerated > ago(timeRange)
    | where isnotempty(DestinationIP) or isnotempty(DestinationHostName)
    | extend matchIndicator = coalesce(DestinationHostName, DestinationIP)
    | join kind=inner (c2Indicators) on $left.matchIndicator == $right.indicator
    | extend SourceIP = SourceIP, DestinationIP = DestinationIP, DnsDomain = DestinationHostName
    | project TimeGenerated, SourceIP, DestinationIP, DnsDomain, DeviceProduct, DeviceAction, threatScore, threatLevel, feedNames, explanation

incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: true
  createIncident: true
name: Whisper Security - C2 Communication Detection
triggerOperator: gt
query: |
  // MITRE ATT&CK: T1071 - Application Layer Protocol
  // Tactic: Command and Control
  // Detects C2 communication by correlating network logs with Whisper threat intel
  let timeRange = 1h;
  let threatThreshold = 60;
  let c2Indicators = WhisperThreatIntel_CL
      | where TimeGenerated > ago(timeRange)
      | where isC2 == true
      | where threatScore > threatThreshold
      | project indicator, threatScore, threatLevel, feedNames, explanation, lastSeen;
  let CommonSecurityLogSafe = union isfuzzy=true CommonSecurityLog, (datatable(TimeGenerated:datetime, DestinationIP:string, DestinationHostName:string, SourceIP:string, DeviceProduct:string, DeviceAction:string)[]);
  CommonSecurityLogSafe
      | where TimeGenerated > ago(timeRange)
      | where isnotempty(DestinationIP) or isnotempty(DestinationHostName)
      | extend matchIndicator = coalesce(DestinationHostName, DestinationIP)
      | join kind=inner (c2Indicators) on $left.matchIndicator == $right.indicator
      | extend SourceIP = SourceIP, DestinationIP = DestinationIP, DnsDomain = DestinationHostName
      | project TimeGenerated, SourceIP, DestinationIP, DnsDomain, DeviceProduct, DeviceAction, threatScore, threatLevel, feedNames, explanation
queryFrequency: 5m
description: |
  Detects command-and-control communication by joining CommonSecurityLog with Whisper threat intelligence data. Fires when network traffic matches a known C2 indicator with a threat score above 60.
id: 00682c4c-b8b5-5ef7-af33-50891b271b7b
triggerThreshold: 0
queryPeriod: 1h
version: 1.0.0
kind: Scheduled
customDetails:
  ThreatLevel: threatLevel
  ThreatScore: threatScore
  FeedNames: feedNames
status: Available
severity: High
requiredDataConnectors:
- connectorId: WhisperSecurityConnector
  dataTypes:
  - WhisperThreatIntel_CL
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Whisper/Analytic%20Rules/C2CommunicationDetection.yaml
relevantTechniques:
- T1071
tactics:
- CommandAndControl
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIP
  entityType: IP
- fieldMappings:
  - identifier: Address
    columnName: DestinationIP
  entityType: IP
- fieldMappings:
  - identifier: DomainName
    columnName: DnsDomain
  entityType: DNS

{
  "$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/00682c4c-b8b5-5ef7-af33-50891b271b7b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/00682c4c-b8b5-5ef7-af33-50891b271b7b')]",
      "properties": {
        "alertRuleTemplateName": "00682c4c-b8b5-5ef7-af33-50891b271b7b",
        "customDetails": {
          "FeedNames": "feedNames",
          "ThreatLevel": "threatLevel",
          "ThreatScore": "threatScore"
        },
        "description": "Detects command-and-control communication by joining CommonSecurityLog with Whisper threat intelligence data. Fires when network traffic matches a known C2 indicator with a threat score above 60.\n",
        "displayName": "Whisper Security - C2 Communication Detection",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "DestinationIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "DNS",
            "fieldMappings": [
              {
                "columnName": "DnsDomain",
                "identifier": "DomainName"
              }
            ]
          }
        ],
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Whisper/Analytic%20Rules/C2CommunicationDetection.yaml",
        "query": "// MITRE ATT&CK: T1071 - Application Layer Protocol\n// Tactic: Command and Control\n// Detects C2 communication by correlating network logs with Whisper threat intel\nlet timeRange = 1h;\nlet threatThreshold = 60;\nlet c2Indicators = WhisperThreatIntel_CL\n    | where TimeGenerated > ago(timeRange)\n    | where isC2 == true\n    | where threatScore > threatThreshold\n    | project indicator, threatScore, threatLevel, feedNames, explanation, lastSeen;\nlet CommonSecurityLogSafe = union isfuzzy=true CommonSecurityLog, (datatable(TimeGenerated:datetime, DestinationIP:string, DestinationHostName:string, SourceIP:string, DeviceProduct:string, DeviceAction:string)[]);\nCommonSecurityLogSafe\n    | where TimeGenerated > ago(timeRange)\n    | where isnotempty(DestinationIP) or isnotempty(DestinationHostName)\n    | extend matchIndicator = coalesce(DestinationHostName, DestinationIP)\n    | join kind=inner (c2Indicators) on $left.matchIndicator == $right.indicator\n    | extend SourceIP = SourceIP, DestinationIP = DestinationIP, DnsDomain = DestinationHostName\n    | project TimeGenerated, SourceIP, DestinationIP, DnsDomain, DeviceProduct, DeviceAction, threatScore, threatLevel, feedNames, explanation\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandAndControl"
        ],
        "techniques": [
          "T1071"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}