Microsoft Sentinel Analytic Rules
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Bitglass - User Agent string has changed for user

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Id4dd61530-859f-49e7-bd27-a173cb1a4589
RulenameBitglass - User Agent string has changed for user
DescriptionDetects when User Agent string has changed for user.
SeverityMedium
TacticsInitialAccess
TechniquesT1078
Required data connectorsBitglass
KindScheduled
Query frequency1h
Query period14d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Bitglass/Analytic Rules/BitglassUserUAChanged.yaml
Version1.0.0
Arm template4dd61530-859f-49e7-bd27-a173cb1a4589.json
Deploy To Azure
Bitglass
| where EventType =~ 'access'
| where EventMessage =~ 'Login'
| summarize ua = makeset(HttpUserAgent) by User
| join (Bitglass
        | where EventType =~ 'access'
        | where EventMessage =~ 'Login') on User
| where ua !contains HttpUserAgent
| extend AccountCustomEntity = User
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
version: 1.0.0
kind: Scheduled
query: |
  Bitglass
  | where EventType =~ 'access'
  | where EventMessage =~ 'Login'
  | summarize ua = makeset(HttpUserAgent) by User
  | join (Bitglass
          | where EventType =~ 'access'
          | where EventMessage =~ 'Login') on User
  | where ua !contains HttpUserAgent
  | extend AccountCustomEntity = User  
queryFrequency: 1h
status: Available
relevantTechniques:
- T1078
description: |
    'Detects when User Agent string has changed for user.'
requiredDataConnectors:
- connectorId: Bitglass
  dataTypes:
  - Bitglass
id: 4dd61530-859f-49e7-bd27-a173cb1a4589
queryPeriod: 14d
name: Bitglass - User Agent string has changed for user
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Bitglass/Analytic Rules/BitglassUserUAChanged.yaml
triggerOperator: gt
triggerThreshold: 0
severity: Medium
tactics:
- InitialAccess
{
  "$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/4dd61530-859f-49e7-bd27-a173cb1a4589')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4dd61530-859f-49e7-bd27-a173cb1a4589')]",
      "properties": {
        "alertRuleTemplateName": "4dd61530-859f-49e7-bd27-a173cb1a4589",
        "customDetails": null,
        "description": "'Detects when User Agent string has changed for user.'\n",
        "displayName": "Bitglass - User Agent string has changed for user",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Bitglass/Analytic Rules/BitglassUserUAChanged.yaml",
        "query": "Bitglass\n| where EventType =~ 'access'\n| where EventMessage =~ 'Login'\n| summarize ua = makeset(HttpUserAgent) by User\n| join (Bitglass\n        | where EventType =~ 'access'\n        | where EventMessage =~ 'Login') on User\n| where ua !contains HttpUserAgent\n| extend AccountCustomEntity = User\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}