Azure DevOps Administrator Group Monitoring

// Change to true to monitor for Project Administrator adds to *any* project
let MonitorAllProjects = false;
// If MonitorAllProjects is false, trigger only on Project Administrator add for the following projects
let ProjectsToMonitor = dynamic(['<project_X>','<project_Y>']);
AzureDevOpsAuditing
| where Area == "Group" and OperationName == "Group.UpdateGroupMembership.Add"
| where Details has 'Administrators'
| where Details has "was added as a member of group" and (Details endswith '\\Project Administrators' or Details endswith '\\Project Collection Administrators')
| parse Details with AddedIdentity ' was added as a member of group [' EntityName ']\\' GroupName
| extend Level = iif(GroupName == 'Project Collection Administrators', 'Organization', 'Project'), AddedIdentityId = Data.MemberId
| extend Severity = iif(Level == 'Organization', 'High', 'Medium'), AlertDetails = strcat('At ', TimeGenerated, ' UTC ', ActorUPN, '/', ActorDisplayName, ' added ', AddedIdentity, ' to the ', EntityName, ' ', Level)
| where MonitorAllProjects == true or EntityName in (ProjectsToMonitor) or Level == 'Organization'
| project TimeGenerated, Severity, Adder = ActorUPN, AddedIdentity, AddedIdentityId, AlertDetails, Level, EntityName, GroupName, ActorAuthType = AuthenticationMechanism,
  ActorIpAddress = IpAddress, ActorUserAgent = UserAgent, RawDetails = Details
| extend timestamp = TimeGenerated
| extend AccountName = tostring(split(Adder, "@")[0]), AccountUPNSuffix = tostring(split(Adder, "@")[1])

relevantTechniques:
- T1098
name: Azure DevOps Administrator Group Monitoring
requiredDataConnectors: []
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Adder
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: ActorIpAddress
  entityType: IP
triggerThreshold: 0
id: 89e6adbd-612c-4fbe-bc3d-32f81baf3b6c
tactics:
- Persistence
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/AzDOAdminGroupAdditions.yaml
queryPeriod: 4h
kind: Scheduled
queryFrequency: 4h
severity: Medium
status: Available
description: |
    'This detection monitors for additions to projects or project collection administration groups in an Azure DevOps Organization.'
query: |
  // Change to true to monitor for Project Administrator adds to *any* project
  let MonitorAllProjects = false;
  // If MonitorAllProjects is false, trigger only on Project Administrator add for the following projects
  let ProjectsToMonitor = dynamic(['<project_X>','<project_Y>']);
  AzureDevOpsAuditing
  | where Area == "Group" and OperationName == "Group.UpdateGroupMembership.Add"
  | where Details has 'Administrators'
  | where Details has "was added as a member of group" and (Details endswith '\\Project Administrators' or Details endswith '\\Project Collection Administrators')
  | parse Details with AddedIdentity ' was added as a member of group [' EntityName ']\\' GroupName
  | extend Level = iif(GroupName == 'Project Collection Administrators', 'Organization', 'Project'), AddedIdentityId = Data.MemberId
  | extend Severity = iif(Level == 'Organization', 'High', 'Medium'), AlertDetails = strcat('At ', TimeGenerated, ' UTC ', ActorUPN, '/', ActorDisplayName, ' added ', AddedIdentity, ' to the ', EntityName, ' ', Level)
  | where MonitorAllProjects == true or EntityName in (ProjectsToMonitor) or Level == 'Organization'
  | project TimeGenerated, Severity, Adder = ActorUPN, AddedIdentity, AddedIdentityId, AlertDetails, Level, EntityName, GroupName, ActorAuthType = AuthenticationMechanism,
    ActorIpAddress = IpAddress, ActorUserAgent = UserAgent, RawDetails = Details
  | extend timestamp = TimeGenerated
  | extend AccountName = tostring(split(Adder, "@")[0]), AccountUPNSuffix = tostring(split(Adder, "@")[1])  
triggerOperator: gt

{
  "$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/89e6adbd-612c-4fbe-bc3d-32f81baf3b6c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/89e6adbd-612c-4fbe-bc3d-32f81baf3b6c')]",
      "properties": {
        "alertRuleTemplateName": "89e6adbd-612c-4fbe-bc3d-32f81baf3b6c",
        "customDetails": null,
        "description": "'This detection monitors for additions to projects or project collection administration groups in an Azure DevOps Organization.'\n",
        "displayName": "Azure DevOps Administrator Group Monitoring",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Adder",
                "identifier": "FullName"
              },
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "ActorIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AzureDevOpsAuditing/Analytic Rules/AzDOAdminGroupAdditions.yaml",
        "query": "// Change to true to monitor for Project Administrator adds to *any* project\nlet MonitorAllProjects = false;\n// If MonitorAllProjects is false, trigger only on Project Administrator add for the following projects\nlet ProjectsToMonitor = dynamic(['<project_X>','<project_Y>']);\nAzureDevOpsAuditing\n| where Area == \"Group\" and OperationName == \"Group.UpdateGroupMembership.Add\"\n| where Details has 'Administrators'\n| where Details has \"was added as a member of group\" and (Details endswith '\\\\Project Administrators' or Details endswith '\\\\Project Collection Administrators')\n| parse Details with AddedIdentity ' was added as a member of group [' EntityName ']\\\\' GroupName\n| extend Level = iif(GroupName == 'Project Collection Administrators', 'Organization', 'Project'), AddedIdentityId = Data.MemberId\n| extend Severity = iif(Level == 'Organization', 'High', 'Medium'), AlertDetails = strcat('At ', TimeGenerated, ' UTC ', ActorUPN, '/', ActorDisplayName, ' added ', AddedIdentity, ' to the ', EntityName, ' ', Level)\n| where MonitorAllProjects == true or EntityName in (ProjectsToMonitor) or Level == 'Organization'\n| project TimeGenerated, Severity, Adder = ActorUPN, AddedIdentity, AddedIdentityId, AlertDetails, Level, EntityName, GroupName, ActorAuthType = AuthenticationMechanism,\n  ActorIpAddress = IpAddress, ActorUserAgent = UserAgent, RawDetails = Details\n| extend timestamp = TimeGenerated\n| extend AccountName = tostring(split(Adder, \"@\")[0]), AccountUPNSuffix = tostring(split(Adder, \"@\")[1])\n",
        "queryFrequency": "PT4H",
        "queryPeriod": "PT4H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence"
        ],
        "techniques": [
          "T1098"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}