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
relevantTechniques:
- T1078
name: Bitglass - User Agent string has changed for user
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  
queryPeriod: 14d
tactics:
- InitialAccess
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - Bitglass
  connectorId: Bitglass
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
id: 4dd61530-859f-49e7-bd27-a173cb1a4589
description: |
    'Detects when User Agent string has changed for user.'
status: Available
queryFrequency: 1h
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Bitglass/Analytic Rules/BitglassUserUAChanged.yaml
triggerThreshold: 0
severity: Medium
version: 1.0.0
{
  "$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"
    }
  ]
}