Creation of expensive computes in Azure
Id | 9736e5f1-7b6e-4bfb-a708-e53ff1d182c3 |
Rulename | Creation of expensive computes in Azure |
Description | Identifies the creation of large size or expensive VMs (with GPUs or with a large number of virtual CPUs) in Azure. An adversary may create new or update existing virtual machines to evade defenses or use them for cryptomining purposes. For Windows/Linux Vm Sizes, see https://docs.microsoft.com/azure/virtual-machines/windows/sizes Azure VM Naming Conventions, see https://docs.microsoft.com/azure/virtual-machines/vm-naming-conventions |
Severity | Low |
Tactics | DefenseEvasion |
Techniques | T1578 |
Required data connectors | AzureActivity |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 1 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/Creation_of_Expensive_Computes_in_Azure.yaml |
Version | 2.0.3 |
Arm template | 9736e5f1-7b6e-4bfb-a708-e53ff1d182c3.json |
let tokens = dynamic(["416","208","192","128","120","96","80","72","64","48","44","40","nc12","nc24","nv24"]);
let operationList = dynamic(["microsoft.compute/virtualmachines/write", "microsoft.resources/deployments/write"]);
AzureActivity
| where OperationNameValue in~ (operationList)
| where ActivityStatusValue startswith "Accept"
| where Properties has 'vmSize'
| extend parsed_property= parse_json(tostring((parse_json(Properties).responseBody))).properties
| extend vmSize = tostring((parsed_property.hardwareProfile).vmSize)
| mv-apply token=tokens to typeof(string) on (where vmSize contains token)
| extend ComputerName = tostring((parsed_property.osProfile).computerName)
| project TimeGenerated, OperationNameValue, ActivityStatusValue, Caller, CallerIpAddress, ComputerName, vmSize
| extend Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])
severity: Low
id: 9736e5f1-7b6e-4bfb-a708-e53ff1d182c3
queryFrequency: 1d
queryPeriod: 1d
relevantTechniques:
- T1578
triggerOperator: gt
status: Available
tactics:
- DefenseEvasion
kind: Scheduled
description: |
'Identifies the creation of large size or expensive VMs (with GPUs or with a large number of virtual CPUs) in Azure.
An adversary may create new or update existing virtual machines to evade defenses or use them for cryptomining purposes.
For Windows/Linux Vm Sizes, see https://docs.microsoft.com/azure/virtual-machines/windows/sizes
Azure VM Naming Conventions, see https://docs.microsoft.com/azure/virtual-machines/vm-naming-conventions'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/Creation_of_Expensive_Computes_in_Azure.yaml
requiredDataConnectors:
- dataTypes:
- AzureActivity
connectorId: AzureActivity
entityMappings:
- entityType: Account
fieldMappings:
- columnName: Caller
identifier: FullName
- columnName: Name
identifier: Name
- columnName: UPNSuffix
identifier: UPNSuffix
- entityType: Host
fieldMappings:
- columnName: ComputerName
identifier: HostName
- entityType: IP
fieldMappings:
- columnName: CallerIpAddress
identifier: Address
query: |
let tokens = dynamic(["416","208","192","128","120","96","80","72","64","48","44","40","nc12","nc24","nv24"]);
let operationList = dynamic(["microsoft.compute/virtualmachines/write", "microsoft.resources/deployments/write"]);
AzureActivity
| where OperationNameValue in~ (operationList)
| where ActivityStatusValue startswith "Accept"
| where Properties has 'vmSize'
| extend parsed_property= parse_json(tostring((parse_json(Properties).responseBody))).properties
| extend vmSize = tostring((parsed_property.hardwareProfile).vmSize)
| mv-apply token=tokens to typeof(string) on (where vmSize contains token)
| extend ComputerName = tostring((parsed_property.osProfile).computerName)
| project TimeGenerated, OperationNameValue, ActivityStatusValue, Caller, CallerIpAddress, ComputerName, vmSize
| extend Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])
version: 2.0.3
name: Creation of expensive computes in Azure
triggerThreshold: 1
{
"$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/9736e5f1-7b6e-4bfb-a708-e53ff1d182c3')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9736e5f1-7b6e-4bfb-a708-e53ff1d182c3')]",
"properties": {
"alertRuleTemplateName": "9736e5f1-7b6e-4bfb-a708-e53ff1d182c3",
"customDetails": null,
"description": "'Identifies the creation of large size or expensive VMs (with GPUs or with a large number of virtual CPUs) in Azure.\nAn adversary may create new or update existing virtual machines to evade defenses or use them for cryptomining purposes.\nFor Windows/Linux Vm Sizes, see https://docs.microsoft.com/azure/virtual-machines/windows/sizes \nAzure VM Naming Conventions, see https://docs.microsoft.com/azure/virtual-machines/vm-naming-conventions'\n",
"displayName": "Creation of expensive computes in Azure",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Caller",
"identifier": "FullName"
},
{
"columnName": "Name",
"identifier": "Name"
},
{
"columnName": "UPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "ComputerName",
"identifier": "HostName"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "CallerIpAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Activity/Analytic Rules/Creation_of_Expensive_Computes_in_Azure.yaml",
"query": "let tokens = dynamic([\"416\",\"208\",\"192\",\"128\",\"120\",\"96\",\"80\",\"72\",\"64\",\"48\",\"44\",\"40\",\"nc12\",\"nc24\",\"nv24\"]);\nlet operationList = dynamic([\"microsoft.compute/virtualmachines/write\", \"microsoft.resources/deployments/write\"]);\nAzureActivity\n| where OperationNameValue in~ (operationList)\n| where ActivityStatusValue startswith \"Accept\"\n| where Properties has 'vmSize'\n| extend parsed_property= parse_json(tostring((parse_json(Properties).responseBody))).properties\n| extend vmSize = tostring((parsed_property.hardwareProfile).vmSize)\n| mv-apply token=tokens to typeof(string) on (where vmSize contains token)\n| extend ComputerName = tostring((parsed_property.osProfile).computerName)\n| project TimeGenerated, OperationNameValue, ActivityStatusValue, Caller, CallerIpAddress, ComputerName, vmSize\n| extend Name = tostring(split(Caller,'@',0)[0]), UPNSuffix = tostring(split(Caller,'@',1)[0])\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Low",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"techniques": [
"T1578"
],
"templateVersion": "2.0.3",
"triggerOperator": "GreaterThan",
"triggerThreshold": 1
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}