Azure DevOps Audit Stream Disabled

Back


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	1.0.1
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, AccountCustomEntity = ActorUPN, IPCustomEntity = IpAddress

YAML

severity: High
name: Azure DevOps Audit Stream Disabled
requiredDataConnectors: []
id: 4e8238bd-ff4f-4126-a9f6-09b3b6801b3d
tactics:
- DefenseEvasion
queryFrequency: 1d
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOAuditStreamDisabled.yaml
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
kind: Scheduled
relevantTechniques:
- T1562.008
query: |
  AzureDevOpsAuditing
  | where OperationName =~ "AuditLog.StreamDisabledByUser"
  | extend StreamType = tostring(Data.ConsumerType)
  | project-reorder TimeGenerated, Details, ActorUPN, IpAddress, UserAgent, StreamType
  | extend timestamp = TimeGenerated, AccountCustomEntity = ActorUPN, IPCustomEntity = IpAddress  
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
status: Available
version: 1.0.1
queryPeriod: 1d

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4e8238bd-ff4f-4126-a9f6-09b3b6801b3d')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4e8238bd-ff4f-4126-a9f6-09b3b6801b3d')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "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 \nbefore 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 \nits unlikely to have a high false positive rate.'\n",
        "severity": "High",
        "enabled": true,
        "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, AccountCustomEntity = ActorUPN, IPCustomEntity = IpAddress\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562.008"
        ],
        "alertRuleTemplateName": "4e8238bd-ff4f-4126-a9f6-09b3b6801b3d",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/ADOAuditStreamDisabled.yaml"
      }
    }
  ]
}