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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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- 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. | ||
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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 | ||
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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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