Azure DevOps Audit Stream Disabled

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Id	4e8238bd-ff4f-4126-a9f6-09b3b6801b3d
Rulename	Azure DevOps Audit Stream Disabled
Description	Azure DevOps allow for audit logs to be streamed to external storage solutions such as SIEM solutions. An attacker looking to hide malicious Azure DevOps activity from defenders may look to disable data streams before conducting activity and then re-enabling the stream after (so as not to raise data threshold-based alarms). Looking for disabled audit streams can identify this activity, and due to the nature of the action its unlikely to have a high false positive rate.
Severity	High
Tactics	DefenseEvasion
Techniques	T1562.008
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOAuditStreamDisabled.yaml
Version	1.0.4
Arm template	4e8238bd-ff4f-4126-a9f6-09b3b6801b3d.json

KQL

AzureDevOpsAuditing
| where OperationName =~ "AuditLog.StreamDisabledByUser"
| extend StreamType = tostring(Data.ConsumerType)
| project-reorder TimeGenerated, Details, ActorUPN, IpAddress, UserAgent, StreamType
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])

YAML

requiredDataConnectors: []
name: Azure DevOps Audit Stream Disabled
queryFrequency: 1d
tactics:
- DefenseEvasion
relevantTechniques:
- T1562.008
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOAuditStreamDisabled.yaml
id: 4e8238bd-ff4f-4126-a9f6-09b3b6801b3d
queryPeriod: 1d
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: ActorUPN
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: IpAddress
  entityType: IP
kind: Scheduled
query: |
  AzureDevOpsAuditing
  | where OperationName =~ "AuditLog.StreamDisabledByUser"
  | extend StreamType = tostring(Data.ConsumerType)
  | project-reorder TimeGenerated, Details, ActorUPN, IpAddress, UserAgent, StreamType
  | extend timestamp = TimeGenerated
  | extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])  
triggerOperator: gt
severity: High
description: |
    'Azure DevOps allow for audit logs to be streamed to external storage solutions such as SIEM solutions. An attacker looking to hide malicious Azure DevOps activity from defenders may look to disable data streams before conducting activity and then re-enabling the stream after (so as not to raise data threshold-based alarms). Looking for disabled audit streams can identify this activity, and due to the nature of the action its unlikely to have a high false positive rate.'
triggerThreshold: 0
version: 1.0.4

ARM

{
  "$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/4e8238bd-ff4f-4126-a9f6-09b3b6801b3d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4e8238bd-ff4f-4126-a9f6-09b3b6801b3d')]",
      "properties": {
        "alertRuleTemplateName": "4e8238bd-ff4f-4126-a9f6-09b3b6801b3d",
        "customDetails": null,
        "description": "'Azure DevOps allow for audit logs to be streamed to external storage solutions such as SIEM solutions. An attacker looking to hide malicious Azure DevOps activity from defenders may look to disable data streams before conducting activity and then re-enabling the stream after (so as not to raise data threshold-based alarms). Looking for disabled audit streams can identify this activity, and due to the nature of the action its unlikely to have a high false positive rate.'\n",
        "displayName": "Azure DevOps Audit Stream Disabled",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "ActorUPN",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOAuditStreamDisabled.yaml",
        "query": "AzureDevOpsAuditing\n| where OperationName =~ \"AuditLog.StreamDisabledByUser\"\n| extend StreamType = tostring(Data.ConsumerType)\n| project-reorder TimeGenerated, Details, ActorUPN, IpAddress, UserAgent, StreamType\n| extend timestamp = TimeGenerated\n| extend AccountName = tostring(split(ActorUPN, \"@\")[0]), AccountUPNSuffix = tostring(split(ActorUPN, \"@\")[1])\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [
          "T1562.008"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}