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New Technique: Access Virtual Machine using Bastion shareable link (#583
) * Add Azure Bastion shareable link technique * Add delay note for Bastion technique * Add techniqe documentation * Change category to persistence * Fix tf formatting * Error and string handling + technique rename * Update v2/internal/attacktechniques/azure/persistence/create-bastion-shareable-link/main.go Co-authored-by: Christophe Tafani-Dereeper <[email protected]> * Update v2/internal/attacktechniques/azure/persistence/create-bastion-shareable-link/main.go Co-authored-by: Christophe Tafani-Dereeper <[email protected]> * Cosmetic changes * Add shareable link + credentials to output * Fix error handling * autogen docs --------- Co-authored-by: Christophe Tafani-Dereeper <[email protected]> Co-authored-by: Christophe Tafani-Dereeper <[email protected]>
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docs/attack-techniques/azure/azure.create-bastion-shareable-link.md
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| --- | ||
| title: Access Virtual Machine using Bastion shareable link | ||
| --- | ||
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| # Access Virtual Machine using Bastion shareable link | ||
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| <span class="smallcaps w3-badge w3-orange w3-round w3-text-sand" title="This attack technique is slow to warm up and cleanup">slow</span> | ||
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| Platform: Azure | ||
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| ## MITRE ATT&CK Tactics | ||
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| - Persistence | ||
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| ## Description | ||
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| By utilizing the 'shareable link' feature on Bastions where it is enabled, an attacker can create a link to allow access to a virtual machine (VM) from untrusted networks. Public links generated for an Azure Bastion can allow VM network access to anyone with the generated URL. | ||
| NOTE: This technique will take 10-15 minutes to warmup, and 10-15 minutes to cleanup. This is due to the time to deploy an Azure Bastion. | ||
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| References: | ||
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| - https://blog.karims.cloud/2022/11/26/yet-another-azure-vm-persistence.html | ||
| - https://learn.microsoft.com/en-us/azure/bastion/shareable-link | ||
| - https://microsoft.github.io/Azure-Threat-Research-Matrix/Persistence/AZT509/AZT509/ | ||
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| <span style="font-variant: small-caps;">Warm-up</span>: | ||
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| - Create a VM and VNet | ||
| - Create an Azure Bastion host with access to the VM, and shareable links enabled | ||
| NOTE: Warm-up and cleanup can each take 10-15 minutes to create and destroy the Azure Bastion instance | ||
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| <span style="font-variant: small-caps;">Detonation</span>: | ||
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| - Create an Azure Bastion shareable link with access to the VM | ||
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| ## Instructions | ||
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| ```bash title="Detonate with Stratus Red Team" | ||
| stratus detonate azure.persistence.bastion-shareable-link | ||
| ``` | ||
| ## Detection | ||
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| Identify Azure events of type <code>Microsoft.Network/bastionHosts/createshareablelinks/action</code> and <code>Microsoft.Network/bastionHosts/getShareablelinks/action</code>. A sample of <code>createshareablelinks</code> is shown below (redacted for clarity). | ||
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| ```json hl_lines="7" | ||
| { | ||
| "category": { | ||
| "value": "Administrative", | ||
| "localizedValue": "Administrative" | ||
| }, | ||
| "level": "Informational", | ||
| "operationName": { | ||
| "value": "Microsoft.Network/bastionHosts/createshareablelinks/action", | ||
| "localizedValue": "Creates shareable urls for the VMs under a bastion and returns the urls" | ||
| }, | ||
| "resourceGroupName": "stratus-red-team-shareable-link-rg-tz6o", | ||
| "resourceProviderName": { | ||
| "value": "Microsoft.Network", | ||
| "localizedValue": "Microsoft.Network" | ||
| }, | ||
| "resourceType": { | ||
| "value": "Microsoft.Network/bastionHosts", | ||
| "localizedValue": "Microsoft.Network/bastionHosts" | ||
| }, | ||
| "resourceId": "[removed]/resourceGroups/stratus-red-team-shareable-link-rg-tz6o/providers/Microsoft.Network/bastionHosts/stratus-red-team-shareable-link-bastion-tz6o", | ||
| "status": { | ||
| "value": "Succeeded", | ||
| "localizedValue": "Succeeded" | ||
| }, | ||
| "subStatus": { | ||
| "value": "", | ||
| "localizedValue": "" | ||
| }, | ||
| "properties": { | ||
| "eventCategory": "Administrative", | ||
| "entity": "[removed]/resourceGroups/stratus-red-team-shareable-link-rg-tz6o/providers/Microsoft.Network/bastionHosts/stratus-red-team-shareable-link-bastion-tz6o", | ||
| "message": "Microsoft.Network/bastionHosts/createshareablelinks/action", | ||
| "hierarchy": "[removed]" | ||
| }, | ||
| } | ||
| ``` |
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docs/attack-techniques/azure/azure.persistence.create-bastion-shareable-link.md
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| --- | ||
| title: Create Azure VM Bastion shareable link | ||
| --- | ||
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| # Create Azure VM Bastion shareable link | ||
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| <span class="smallcaps w3-badge w3-orange w3-round w3-text-sand" title="This attack technique might be slow to warm up or detonate">slow</span> | ||
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| Platform: Azure | ||
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| ## MITRE ATT&CK Tactics | ||
|
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||
|
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| - Persistence | ||
|
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| ## Description | ||
|
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||
|
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| By utilizing the 'shareable link' feature on Bastions where it is enabled, an attacker can create a link to allow access to a virtual machine (VM) from untrusted networks. Public links generated for an Azure Bastion can allow VM network access to anyone with the generated URL. | ||
|
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||
| References: | ||
|
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| - https://blog.karims.cloud/2022/11/26/yet-another-azure-vm-persistence.html | ||
| - https://learn.microsoft.com/en-us/azure/bastion/shareable-link | ||
| - https://microsoft.github.io/Azure-Threat-Research-Matrix/Persistence/AZT509/AZT509/ | ||
|
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||
| <span style="font-variant: small-caps;">Warm-up</span>: | ||
|
|
||
| - Create a VM and VNet | ||
| - Create an Azure Bastion host with access to the VM, and shareable links enabled | ||
|
|
||
| NOTE: Warm-up and cleanup can each take 10-15 minutes to create and destroy the Azure Bastion instance | ||
|
|
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| <span style="font-variant: small-caps;">Detonation</span>: | ||
|
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| - Create an Azure Bastion shareable link with access to the VM | ||
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| ## Instructions | ||
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| ```bash title="Detonate with Stratus Red Team" | ||
| stratus detonate azure.persistence.create-bastion-shareable-link | ||
| ``` | ||
| ## Detection | ||
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| Identify Azure events of type <code>Microsoft.Network/bastionHosts/createshareablelinks/action</code> and <code>Microsoft.Network/bastionHosts/getShareablelinks/action</code>. A sample of <code>createshareablelinks</code> is shown below (redacted for clarity). | ||
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| ```json hl_lines="7" | ||
| { | ||
| { | ||
| "category": { | ||
| "value": "Administrative", | ||
| "localizedValue": "Administrative" | ||
| }, | ||
| "level": "Informational", | ||
| "operationName": { | ||
| "value": "Microsoft.Network/bastionHosts/createshareablelinks/action", | ||
| "localizedValue": "Creates shareable urls for the VMs under a bastion and returns the urls" | ||
| }, | ||
| "resourceGroupName": "stratus-red-team-shareable-link-rg-tz6o", | ||
| "resourceProviderName": { | ||
| "value": "Microsoft.Network", | ||
| "localizedValue": "Microsoft.Network" | ||
| }, | ||
| "resourceType": { | ||
| "value": "Microsoft.Network/bastionHosts", | ||
| "localizedValue": "Microsoft.Network/bastionHosts" | ||
| }, | ||
| "resourceId": "[removed]/resourceGroups/stratus-red-team-shareable-link-rg-tz6o/providers/Microsoft.Network/bastionHosts/stratus-red-team-shareable-link-bastion-tz6o", | ||
| "status": { | ||
| "value": "Succeeded", | ||
| "localizedValue": "Succeeded" | ||
| }, | ||
| "subStatus": { | ||
| "value": "", | ||
| "localizedValue": "" | ||
| }, | ||
| "properties": { | ||
| "eventCategory": "Administrative", | ||
| "entity": "[removed]/resourceGroups/stratus-red-team-shareable-link-rg-tz6o/providers/Microsoft.Network/bastionHosts/stratus-red-team-shareable-link-bastion-tz6o", | ||
| "message": "Microsoft.Network/bastionHosts/createshareablelinks/action", | ||
| "hierarchy": "[removed]" | ||
| }, | ||
| } | ||
| ``` | ||
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