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