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Tutorial: View Azure DDoS Protection logs in Log Analytics workspace

In this tutorial, you learn how to:

  • view Azure DDoS Protection diagnostic logs including notifications, mitigation reports and mitigation flow logs.

DDoS Protection diagnostic logs provide you with the ability to view DDoS Protection notifications, mitigation reports and mitigation flow logs after a DDoS attack. You can view these logs in your Log Analytics workspace.

Attack mitigation reports use the Netflow protocol data, which is aggregated to provide detailed information about the attack on your resource. Anytime a public IP resource is under attack, the report generation starts as soon as the mitigation starts. There will be an incremental report generated every 5 mins and a post-mitigation report for the whole mitigation period. This is to ensure that in an event the DDoS attack continues for a longer duration of time, you'll be able to view the most current snapshot of mitigation report every 5 minutes and a complete summary once the attack mitigation is over.

Prerequisites

View in Log Analytics workspace

  1. Sign in to the Azure portal.

  2. In the search box at the top of the portal, enter Log Analytics workspace. Select Log Analytics workspace in the search results.

  3. Under the Log Analytics workspaces blade, select your workspace.

  4. On the left-side tab, select Logs. Here you see the query explorer. Exit out the Queries pane to utilize the Logs page.

    Screenshot of viewing a log analytics workspace.

  5. In the Logs page, type in your query then hit Run to view results.

    Screenshot of viewing DDoS Protection notification logs in log analytics workspace.

Query Azure DDoS Protection logs in log analytics workspace

For more information on log schemas, see View diagnostic logs.

DDoSProtectionNotifications logs

  1. Under the Log analytics workspaces blade, select your log analytics workspace.

  2. On the left side pane, select Logs.

    Screenshot of log query in Log analytics workspaces.

  3. In Query explorer, type in the following Kusto Query and change the time range to Custom and change the time range to last three months. Then hit Run.

    AzureDiagnostics
    | where Category == "DDoSProtectionNotifications"
    
  4. To view DDoSMitigationFlowLogs change the query to the following and keep the same time range and hit Run.

    AzureDiagnostics
    | where Category == "DDoSMitigationFlowLogs"
    
  5. To view DDoSMitigationReports change the query to the following and keep the same time range and hit Run.

    AzureDiagnostics
    | where Category == "DDoSMitigationReports"
    

Example log queries

DDoS Protection Notifications

Notifications will notify you anytime a public IP resource is under attack, and when attack mitigation is over.

AzureDiagnostics
| where Category == "DDoSProtectionNotifications"

The following table lists the field names and descriptions:

Field name Description
TimeGenerated The date and time in UTC when the notification was created.
ResourceId The resource ID of your public IP address.
Category For notifications, this will be DDoSProtectionNotifications.
ResourceGroup The resource group that contains your public IP address and virtual network.
SubscriptionId Your DDoS protection plan subscription ID.
Resource The name of your public IP address.
ResourceType This will always be PUBLICIPADDRESS.
OperationName For notifications, this is DDoSProtectionNotifications.
Message Details of the attack.
Type Type of notification. Possible values include MitigationStarted. MitigationStopped.
PublicIpAddress Your public IP address.

DDoS Mitigation FlowLogs

Attack mitigation flow logs allow you to review the dropped traffic, forwarded traffic, and other interesting data-points during an active DDoS attack in near-real time. You can ingest the constant stream of this data into Microsoft Sentinel or to your third-party SIEM systems via event hub for near-real time monitoring, take potential actions and address the need of your defense operations.

AzureDiagnostics
| where Category == "DDoSMitigationFlowLogs"

The following table lists the field names and descriptions:

Field name Description
TimeGenerated The date and time in UTC when the flow log was created.
ResourceId The resource ID of your public IP address.
Category For flow logs, this is DDoSMitigationFlowLogs.
ResourceGroup The resource group that contains your public IP address and virtual network.
SubscriptionId Your DDoS protection plan subscription ID.
Resource The name of your public IP address.
ResourceType This will always be PUBLICIPADDRESS.
OperationName For flow logs, this is DDoSMitigationFlowLogs.
Message Details of the attack.
SourcePublicIpAddress The public IP address of the client generating traffic to your public IP address.
SourcePort Port number ranging from 0 to 65535.
DestPublicIpAddress Your public IP address.
DestPort Port number ranging from 0 to 65535.
Protocol Type of protocol. Possible values include tcp, udp, other.

DDoS Mitigation Reports

AzureDiagnostics
| where Category == "DDoSMitigationReports"

The following table lists the field names and descriptions:

Field name Description
TimeGenerated The date and time in UTC when the notification was created.
ResourceId The resource ID of your public IP address.
Category For mitigation reports, this is DDoSMitigationReports.
ResourceGroup The resource group that contains your public IP address and virtual network.
SubscriptionId Your DDoS protection plan subscription ID.
Resource The name of your public IP address.
ResourceType This will always be PUBLICIPADDRESS.
OperationName For mitigation reports, this is DDoSMitigationReports
ReportType Possible values are Incremental and PostMitigation.
MitigationPeriodStart The date and time in UTC when the mitigation started.
MitigationPeriodEnd The date and time in UTC when the mitigation ended.
IPAddress Your public IP Address.
AttackVectors Degradation of attack types. The keys include TCP SYN flood, TCP flood, UDP flood, UDP reflection, and Other packet flood.
TrafficOverview Degradation of attack traffic. The keys include Total packets, Total packets dropped, Total TCP packets, Total TCP packets dropped, Total UDP packets, Total UDP packets dropped, Total Other packets, and Total Other packets dropped.
Protocols   Breakdown of protocols included. The keys include TCP, UDP, and Other.   
DropReasons Analysis of causes of dropped packets. The keys include Protocol violation invalid TCP. syn Protocol violation invalid TCP, Protocol violation invalid UDP, UDP reflection, TCP rate limit exceeded, UDP rate limit exceeded, Destination limit exceeded, Other packet flood Rate limit exceeded, and Packet was forwarded to service. Protocol violation invalid drop reasons refer to malformed packets.
TopSourceCountries Breakdown of the top 10 source countries into inbound traffic.
TopSourceCountriesForDroppedPackets Analysis of the top 10 source countries for attack traffic that have been throttled.
TopSourceASNs Analysis of the top 10 sources of autonomous system numbers (ASNs) of incoming traffic.  
SourceContinents Analysis of the source continent for inbound traffic.
Type Type of notification. Possible values include MitigationStarted. MitigationStopped.

Next steps

In this tutorial, you learned how to view DDoS Protection diagnostic logs in a Log Analytics workspace. To learn more about the recommended steps to take when you receive a DDoS attack, see these next steps.