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	2.0.0
Arm template	9fb57e58-3ed8-4b89-afcf-c8e786508b1c.json

KQL

let szOperationNames = dynamic(["Microsoft.Compute/virtualMachines/write", "Microsoft.Resources/deployments/write"]);
let starttime = 14d;
let endtime = 1d;
let RareCaller = AzureActivity
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationNameValue in~ (szOperationNames)
| project ResourceGroup, Caller, OperationNameValue, CallerIpAddress
| join kind=rightantisemi (
AzureActivity
| where TimeGenerated > ago(endtime)
| where OperationNameValue in~ (szOperationNames)
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityStatusValue = makeset(ActivityStatusValue), OperationIds = makeset(OperationId), CallerIpAddress = makeset(CallerIpAddress) 
by ResourceId, Caller, OperationNameValue, Resource, ResourceGroup
) on Caller, ResourceGroup 
| mvexpand CallerIpAddress
| where isnotempty(CallerIpAddress);
let Counts = RareCaller | summarize ActivityCountByCaller = count() by Caller;
RareCaller | join kind= inner (Counts) on Caller | project-away Caller1
| extend timestamp = StartTimeUtc, AccountCustomEntity = Caller, IPCustomEntity = tostring(CallerIpAddress)
| sort by ActivityCountByCaller desc nulls last

YAML

version: 2.0.0
status: Available
queryFrequency: 1d
requiredDataConnectors:
- connectorId: AzureActivity
  dataTypes:
  - AzureActivity
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
kind: Scheduled
queryPeriod: 14d
severity: Low
query: |
  let szOperationNames = dynamic(["Microsoft.Compute/virtualMachines/write", "Microsoft.Resources/deployments/write"]);
  let starttime = 14d;
  let endtime = 1d;
  let RareCaller = AzureActivity
  | where TimeGenerated between (ago(starttime) .. ago(endtime))
  | where OperationNameValue in~ (szOperationNames)
  | project ResourceGroup, Caller, OperationNameValue, CallerIpAddress
  | join kind=rightantisemi (
  AzureActivity
  | where TimeGenerated > ago(endtime)
  | where OperationNameValue in~ (szOperationNames)
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityStatusValue = makeset(ActivityStatusValue), OperationIds = makeset(OperationId), CallerIpAddress = makeset(CallerIpAddress) 
  by ResourceId, Caller, OperationNameValue, Resource, ResourceGroup
  ) on Caller, ResourceGroup 
  | mvexpand CallerIpAddress
  | where isnotempty(CallerIpAddress);
  let Counts = RareCaller | summarize ActivityCountByCaller = count() by Caller;
  RareCaller | join kind= inner (Counts) on Caller | project-away Caller1
  | extend timestamp = StartTimeUtc, AccountCustomEntity = Caller, IPCustomEntity = tostring(CallerIpAddress)
  | sort by ActivityCountByCaller desc nulls last   
triggerOperator: gt
id: 9fb57e58-3ed8-4b89-afcf-c8e786508b1c
description: |
    'Identifies when a rare Resource and ResourceGroup deployment occurs by a previously unseen Caller.'
triggerThreshold: 0
name: Suspicious Resource deployment
relevantTechniques:
- T1496
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/NewResourceGroupsDeployedTo.yaml

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/9fb57e58-3ed8-4b89-afcf-c8e786508b1c')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9fb57e58-3ed8-4b89-afcf-c8e786508b1c')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Suspicious Resource deployment",
        "description": "'Identifies when a rare Resource and ResourceGroup deployment occurs by a previously unseen Caller.'\n",
        "severity": "Low",
        "enabled": true,
        "query": "let szOperationNames = dynamic([\"Microsoft.Compute/virtualMachines/write\", \"Microsoft.Resources/deployments/write\"]);\nlet starttime = 14d;\nlet endtime = 1d;\nlet RareCaller = AzureActivity\n| where TimeGenerated between (ago(starttime) .. ago(endtime))\n| where OperationNameValue in~ (szOperationNames)\n| project ResourceGroup, Caller, OperationNameValue, CallerIpAddress\n| join kind=rightantisemi (\nAzureActivity\n| where TimeGenerated > ago(endtime)\n| where OperationNameValue in~ (szOperationNames)\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), ActivityStatusValue = makeset(ActivityStatusValue), OperationIds = makeset(OperationId), CallerIpAddress = makeset(CallerIpAddress) \nby ResourceId, Caller, OperationNameValue, Resource, ResourceGroup\n) on Caller, ResourceGroup \n| mvexpand CallerIpAddress\n| where isnotempty(CallerIpAddress);\nlet Counts = RareCaller | summarize ActivityCountByCaller = count() by Caller;\nRareCaller | join kind= inner (Counts) on Caller | project-away Caller1\n| extend timestamp = StartTimeUtc, AccountCustomEntity = Caller, IPCustomEntity = tostring(CallerIpAddress)\n| sort by ActivityCountByCaller desc nulls last \n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1496"
        ],
        "alertRuleTemplateName": "9fb57e58-3ed8-4b89-afcf-c8e786508b1c",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/NewResourceGroupsDeployedTo.yaml",
        "templateVersion": "2.0.0"
      }
    }
  ]
}