Microsoft

Azure Activity logs  provides insight into any subscription-level or management group level events that have occurred in Azure, there are three main categories covered under Azure Activity and a bunch of resource types, for more details click here:

  • Azure Resources
  • Audit
  • Security

Each event in the Activity Log has a particular category . See the sections below for more detail on each category and its schema when you access the Activity log from the portal, PowerShell, CLI, and REST API. The schema is different when you stream the Activity log to storage or Event Hubs: 

 

Category Description
Administrative Contains the record of all create, update, delete, and action operations performed through Resource Manager. Examples of Administrative events include create virtual machine and delete network security group.

Every action taken by a user or application using Resource Manager is modeled as an operation on a particular resource type. If the operation type is Write, Delete, or Action, the records of both the start and success or fail of that operation are recorded in the Administrative category. Administrative events also include any changes to role-based access control in a subscription.
Service Health Contains the record of any service health incidents that have occurred in Azure. An example of a Service Health event SQL Azure in East US is experiencing downtime.

Service Health events come in Six varieties: Action Required, Assisted Recovery, Incident, Maintenance, Information, or Security. These events are only created if you have a resource in the subscription that would be impacted by the event.
Resource Health Contains the record of any resource health events that have occurred to your Azure resources. An example of a Resource Health event is Virtual Machine health status changed to unavailable.

Resource Health events can represent one of four health statuses: Available, Unavailable, Degraded, and Unknown. Additionally, Resource Health events can be categorized as being Platform Initiated or User Initiated.
Alert Contains the record of activations for Azure alerts. An example of an Alert event is CPU % on myVM has been over 80 for the past 5 minutes.
Autoscale Contains the record of any events related to the operation of the autoscale engine based on any autoscale settings you have defined in your subscription. An example of an Autoscale event is Autoscale scale up action failed.
Recommendation Contains recommendation events from Azure Advisor.
Security Contains the record of any alerts generated by Azure Security Center. An example of a Security event is Suspicious double extension file executed.
Policy Contains records of all effect action operations performed by Azure Policy. Examples of Policy events include Audit and Deny. Every action taken by Policy is modeled as an operation on a resource.

 

Our hunting library for today will shed more lights on "Administrative" category which contains the record of all create, update, delete, and action operations performed through Resource Manager, this means an auditing  & reporting activities have to be in place and hence there are a set of operations (Operation Name) which defines a resource types.

 

Hunting such kind of activities (aka: Clues) require defining the category, operation name "value" & activity value. Before sharing couple of hunting use-cases let's have a look at a set of administrative operations as a sample:

 

Operation name Resource type
Create or update workbook Microsoft.Insights/workbooks
Delete Workbook Microsoft.Insights/workbooks
Set Workflow - Playbook Microsoft.Logic/workflows
Delete Workflow - Playbook Microsoft.Logic/workflows
Create Saved Search Microsoft.OperationalInsights/workspaces/savedSearches
Delete Saved Search Microsoft.OperationalInsights/workspaces/savedSearches
Update Alert - Analytics Rules Microsoft.SecurityInsights/alertRules
Delete Alert  - Analytics  Rules Microsoft.SecurityInsights/alertRules
Update Alert Rule Response Actions Microsoft.SecurityInsights/alertRules/actions
Delete Alert Rule Response Actions Microsoft.SecurityInsights/alertRules/actions
Update Bookmarks Microsoft.SecurityInsights/bookmarks
Delete Bookmarks Microsoft.SecurityInsights/bookmarks
Update Cases Microsoft.SecurityInsights/Cases
Update Case Investigation Microsoft.SecurityInsights/Cases/investigations
Create Case Comments Microsoft.SecurityInsights/Cases/comments
Update Data Connectors Microsoft.SecurityInsights/dataConnectors
Delete Data Connectors Microsoft.SecurityInsights/dataConnectors
Update Settings Microsoft.SecurityInsights/settings
Update / Delete NSG Microsoft.Network/networkSecurityGroups
Create / Update / Delete Pubic IP Addresses Microsoft.Network/publicIPAddresses
Create / Update / Delete Network Interfaces Microsoft.Network/networkInterfaces
Route tables actions Microsoft.Network/routeTables
Create / Update / Delete Front door web app firewall policies Microsoft.Network/frontdoorwebapplicationfirewallpolicies
DDOS Protection Plans Actions Microsoft.Network/ddosProtectionPlans
Create / Update / Delete Virtual Networks Microsoft.Network/virtualNetworks
Create / Update / Delete Front doors Microsoft.Network/frontdoors
Create / Update / Delete Subnets Microsoft.Network/virtualNetworks/subnets
Create / Update / Delete Application Gateways  Microsoft.Network/applicationGateways
Create / Update / Delete Update Virtual Network Peerings Microsoft.Network/virtualNetworks/virtualNetworkPeerings
Firewall Policies Rule Groups Actions Microsoft.Network/firewallPolicies/ruleGroups
Create / Update / Delete Azure Firewalls  Microsoft.Network/azureFirewalls
Create / Update  / Delete Firewall Policies Microsoft.Network/firewallPolicies
DNS Resources Actions Microsoft.Network/getDnsResourceReference

 

Use- Cases:

 

#1 Creating a new Azure Sentinel Analytics - Rule:

 

AzureActivity
| where Category == "Administrative"
| where OperationNameValue == "Microsoft.SecurityInsights/alertRules/write"
| where ActivitySubstatusValue == "Created"

 

 

#2 Deleting an existing Azure Sentinel Analytics - Rule:

 

AzureActivity
| where Category == "Administrative"
| where OperationNameValue == "Microsoft.SecurityInsights/alertRules/delete"
| where ActivitySubstatusValue == "OK"

 

 

#3 Creating a new NSG:

 

// NSG : 201 Created status means "Created" 
AzureActivity
| where Category == "Administrative"
| where OperationNameValue == "Microsoft.Network/networkSecurityGroups/write"
| where ActivitySubstatusValue == "Created"

 

 

#4 Updating an Existing NSG:

 

// NSG : 200 Ok status means "Updated"
AzureActivity
| where Category == "Administrative"
| where OperationNameValue == "Microsoft.Network/networkSecurityGroups/write"
| where ActivitySubstatusValue == "OK"

 

 

#5 Creating Virtual Network Subnets:

 

// Virtual Networks Subnets Creation
AzureActivity
| where Category == "Administrative"
| where OperationNameValue == "Microsoft.Network/virtualNetworks/subnets/write"
| where ActivitySubstatusValue == "Created"

 

 

And much more use-cases and hunting queries can be configured, we make it easy so check out the Azure Sentinel Administrative Suspicious Activities Library uploaded to gihub :

AnalyticsRulesAdministrativeOperations

AzureNSG_AdministrativeOperations

AzureSentinelWorkbooks_AdministrativeOperation

AzureVirtualNetworkSubnets_AdministrativeOperationset

 

Last but not least, how about visualization - reporting via Workbooks ?

@Clive Watson built a new workbook version that shows in a new [Computer] tab the NSG to Computer relationship, as well as items such as Public and Private IP, policy and version (and many more) with lots of search options, check this out and download from:
https://lnkd.in/dyzJhiT

 

Enjoy hunting the clues! and please share your feedback.