Copilot - Plugin Tampering Enable and Disable Within 5 Minutes

CopilotActivity
| where RecordType in ("EnableCopilotPlugin","DisableCopilotPlugin")
| summarize
    Actions = make_set(RecordType),
    FirstSeen = min(TimeGenerated),
    LastSeen = max(TimeGenerated)
  by ActorName, SrcIpAddr
| where Actions has "EnableCopilotPlugin" and Actions has "DisableCopilotPlugin"
| where LastSeen - FirstSeen < 5m
| extend AccountCustomEntity = ActorName, IPCustomEntity = SrcIpAddr

triggerThreshold: 0
kind: Scheduled
description: |
  'Detects when a user enables and disables Copilot plugins within a 5-minute window. This behavior often indicates probing for security controls or living-off-Copilot techniques.
  This rule identifies discovery and defense evasion activities where users rapidly toggle plugin states, potentially testing security boundaries.'
queryFrequency: 5m
triggerOperator: gt
relevantTechniques:
- T1087
- T1562
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
id: d4e5f6a7-b8c9-40d1-e2f3-a4b5c6d7e8f9
query: |
  CopilotActivity
  | where RecordType in ("EnableCopilotPlugin","DisableCopilotPlugin")
  | summarize
      Actions = make_set(RecordType),
      FirstSeen = min(TimeGenerated),
      LastSeen = max(TimeGenerated)
    by ActorName, SrcIpAddr
  | where Actions has "EnableCopilotPlugin" and Actions has "DisableCopilotPlugin"
  | where LastSeen - FirstSeen < 5m
  | extend AccountCustomEntity = ActorName, IPCustomEntity = SrcIpAddr
version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Copilot/Analytic%20Rules/CopilotPluginTampering.yaml
requiredDataConnectors:
- dataTypes:
  - CopilotActivity
  connectorId: MicrosoftCopilot
tactics:
- Discovery
- DefenseEvasion
queryPeriod: 5m
severity: Medium
status: Available
name: Copilot - Plugin Tampering (Enable and Disable Within 5 Minutes)

{
  "$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/d4e5f6a7-b8c9-40d1-e2f3-a4b5c6d7e8f9')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d4e5f6a7-b8c9-40d1-e2f3-a4b5c6d7e8f9')]",
      "properties": {
        "alertRuleTemplateName": "d4e5f6a7-b8c9-40d1-e2f3-a4b5c6d7e8f9",
        "customDetails": null,
        "description": "'Detects when a user enables and disables Copilot plugins within a 5-minute window. This behavior often indicates probing for security controls or living-off-Copilot techniques.\nThis rule identifies discovery and defense evasion activities where users rapidly toggle plugin states, potentially testing security boundaries.'\n",
        "displayName": "Copilot - Plugin Tampering (Enable and Disable Within 5 Minutes)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft%20Copilot/Analytic%20Rules/CopilotPluginTampering.yaml",
        "query": "CopilotActivity\n| where RecordType in (\"EnableCopilotPlugin\",\"DisableCopilotPlugin\")\n| summarize\n    Actions = make_set(RecordType),\n    FirstSeen = min(TimeGenerated),\n    LastSeen = max(TimeGenerated)\n  by ActorName, SrcIpAddr\n| where Actions has \"EnableCopilotPlugin\" and Actions has \"DisableCopilotPlugin\"\n| where LastSeen - FirstSeen < 5m\n| extend AccountCustomEntity = ActorName, IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Discovery"
        ],
        "techniques": [
          "T1087",
          "T1562"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}