Suspicious Resource deployment

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Id	9fb57e58-3ed8-4b89-afcf-c8e786508b1c
Rulename	Suspicious Resource deployment
Description	Identifies when a rare Resource and ResourceGroup deployment occurs by a previously unseen caller.
Severity	Low
Tactics	Impact
Techniques	T1496
Required data connectors	AzureActivity
Kind	Scheduled
Query frequency	1d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/NewResourceGroupsDeployedTo.yaml
Version	2.0.4
Arm template	9fb57e58-3ed8-4b89-afcf-c8e786508b1c.json

KQL

// Add or remove operation names below as per your requirements. For operations lists, please refer to https://learn.microsoft.com/en-us/Azure/role-based-access-control/resource-provider-operations#all
let szOperationNames = dynamic(["Microsoft.Compute/virtualMachines/write", "Microsoft.Resources/deployments/write", "Microsoft.Resources/subscriptions/resourceGroups/write"]);
let starttime = 14d;
let endtime = 1d;
let RareCaller = AzureActivity
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationNameValue in~ (szOperationNames)
| summarize count() by CallerIpAddress, Caller, OperationNameValue, bin(TimeGenerated,1d)
// Returns all the records from the right side that don't have matches from the left.
| join kind=rightantisemi (
AzureActivity
| where TimeGenerated > ago(endtime)
| where OperationNameValue in~ (szOperationNames)
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityTimeStamp = make_set(TimeGenerated,100), ActivityStatusValue = make_set(ActivityStatusValue,100), CorrelationIds = make_set(CorrelationId,100), ResourceGroups = make_set(ResourceGroup,100), ResourceIds = make_set(_ResourceId,100), ActivityCountByCallerIPAddress = count()
by CallerIpAddress, Caller, OperationNameValue) on CallerIpAddress, Caller, OperationNameValue;
RareCaller
| extend Name = iif(Caller has '@',tostring(split(Caller,'@',0)[0]),"")
| extend UPNSuffix = iif(Caller has '@',tostring(split(Caller,'@',1)[0]),"")
| extend AadUserId = iif(Caller !has '@',Caller,"")

YAML

relevantTechniques:
- T1496
name: Suspicious Resource deployment
requiredDataConnectors:
- dataTypes:
  - AzureActivity
  connectorId: AzureActivity
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Caller
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: AadUserId
    columnName: AadUserId
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: CallerIpAddress
  entityType: IP
triggerThreshold: 0
id: 9fb57e58-3ed8-4b89-afcf-c8e786508b1c
tactics:
- Impact
version: 2.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/NewResourceGroupsDeployedTo.yaml
queryPeriod: 14d
kind: Scheduled
queryFrequency: 1d
severity: Low
status: Available
description: |
    'Identifies when a rare Resource and ResourceGroup deployment occurs by a previously unseen caller.'
query: |
  // Add or remove operation names below as per your requirements. For operations lists, please refer to https://learn.microsoft.com/en-us/Azure/role-based-access-control/resource-provider-operations#all
  let szOperationNames = dynamic(["Microsoft.Compute/virtualMachines/write", "Microsoft.Resources/deployments/write", "Microsoft.Resources/subscriptions/resourceGroups/write"]);
  let starttime = 14d;
  let endtime = 1d;
  let RareCaller = AzureActivity
  | where TimeGenerated between (ago(starttime) .. ago(endtime))
  | where OperationNameValue in~ (szOperationNames)
  | summarize count() by CallerIpAddress, Caller, OperationNameValue, bin(TimeGenerated,1d)
  // Returns all the records from the right side that don't have matches from the left.
  | join kind=rightantisemi (
  AzureActivity
  | where TimeGenerated > ago(endtime)
  | where OperationNameValue in~ (szOperationNames)
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityTimeStamp = make_set(TimeGenerated,100), ActivityStatusValue = make_set(ActivityStatusValue,100), CorrelationIds = make_set(CorrelationId,100), ResourceGroups = make_set(ResourceGroup,100), ResourceIds = make_set(_ResourceId,100), ActivityCountByCallerIPAddress = count()
  by CallerIpAddress, Caller, OperationNameValue) on CallerIpAddress, Caller, OperationNameValue;
  RareCaller
  | extend Name = iif(Caller has '@',tostring(split(Caller,'@',0)[0]),"")
  | extend UPNSuffix = iif(Caller has '@',tostring(split(Caller,'@',1)[0]),"")
  | extend AadUserId = iif(Caller !has '@',Caller,"")  
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": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/9fb57e58-3ed8-4b89-afcf-c8e786508b1c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9fb57e58-3ed8-4b89-afcf-c8e786508b1c')]",
      "properties": {
        "alertRuleTemplateName": "9fb57e58-3ed8-4b89-afcf-c8e786508b1c",
        "customDetails": null,
        "description": "'Identifies when a rare Resource and ResourceGroup deployment occurs by a previously unseen caller.'\n",
        "displayName": "Suspicious Resource deployment",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Caller",
                "identifier": "FullName"
              },
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AadUserId",
                "identifier": "AadUserId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "CallerIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/NewResourceGroupsDeployedTo.yaml",
        "query": "// Add or remove operation names below as per your requirements. For operations lists, please refer to https://learn.microsoft.com/en-us/Azure/role-based-access-control/resource-provider-operations#all\nlet szOperationNames = dynamic([\"Microsoft.Compute/virtualMachines/write\", \"Microsoft.Resources/deployments/write\", \"Microsoft.Resources/subscriptions/resourceGroups/write\"]);\nlet starttime = 14d;\nlet endtime = 1d;\nlet RareCaller = AzureActivity\n| where TimeGenerated between (ago(starttime) .. ago(endtime))\n| where OperationNameValue in~ (szOperationNames)\n| summarize count() by CallerIpAddress, Caller, OperationNameValue, bin(TimeGenerated,1d)\n// Returns all the records from the right side that don't have matches from the left.\n| join kind=rightantisemi (\nAzureActivity\n| where TimeGenerated > ago(endtime)\n| where OperationNameValue in~ (szOperationNames)\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityTimeStamp = make_set(TimeGenerated,100), ActivityStatusValue = make_set(ActivityStatusValue,100), CorrelationIds = make_set(CorrelationId,100), ResourceGroups = make_set(ResourceGroup,100), ResourceIds = make_set(_ResourceId,100), ActivityCountByCallerIPAddress = count()\nby CallerIpAddress, Caller, OperationNameValue) on CallerIpAddress, Caller, OperationNameValue;\nRareCaller\n| extend Name = iif(Caller has '@',tostring(split(Caller,'@',0)[0]),\"\")\n| extend UPNSuffix = iif(Caller has '@',tostring(split(Caller,'@',1)[0]),\"\")\n| extend AadUserId = iif(Caller !has '@',Caller,\"\")\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1496"
        ],
        "templateVersion": "2.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}