Microsoft Sentinel Analytic Rules
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Zscaler - Unexpected update operation

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Id672e2846-4226-11ec-81d3-0242ac130003
RulenameZscaler - Unexpected update operation
DescriptionDetects unexpected version of update operation.
SeverityMedium
TacticsInitialAccess
TechniquesT1190
T1133
Required data connectorsCustomLogsAma
ZscalerPrivateAccess
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Zscaler Private Access (ZPA)/Analytic Rules/ZscalerUnexpectedUpdateOperation.yaml
Version1.0.1
Arm template672e2846-4226-11ec-81d3-0242ac130003.json
Deploy To Azure
ZPAEvent
| where isnotempty(AuditOperationType)
| extend ExpectedVersion1 = extract(@'(expectedVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 2, AuditOldValue)
| extend ExpectedVersion2 = extract(@'(expectedVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 3, AuditOldValue)
| extend NewVersion1 = extract(@'("currentVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 2, AuditNewValue)
| extend NewVersion2 = extract(@'("currentVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 3, AuditNewValue)
| extend Comparision1 = iff(tolong(ExpectedVersion2) > tolong(NewVersion2), 'Unexpected version', 'Expected version')
| extend VersionCheck = iff(tolong(ExpectedVersion1) > tolong(NewVersion1), 'Unexpected version', Comparision1)
| project-away ExpectedVersion1, ExpectedVersion2, NewVersion1, NewVersion2, Comparision1
| extend ProcessCustomEntity = AuditOperationType
name: Zscaler - Unexpected update operation
version: 1.0.1
severity: Medium
queryFrequency: 1h
triggerOperator: gt
relevantTechniques:
- T1190
- T1133
status: Available
description: |
    'Detects unexpected version of update operation.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Zscaler Private Access (ZPA)/Analytic Rules/ZscalerUnexpectedUpdateOperation.yaml
requiredDataConnectors:
- connectorId: ZscalerPrivateAccess
  dataTypes:
  - ZPAEvent
- connectorId: CustomLogsAma
  datatypes:
  - ZPA_CL
entityMappings:
- fieldMappings:
  - identifier: ProcessId
    columnName: ProcessCustomEntity
  entityType: Process
tactics:
- InitialAccess
queryPeriod: 1h
query: |
  ZPAEvent
  | where isnotempty(AuditOperationType)
  | extend ExpectedVersion1 = extract(@'(expectedVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 2, AuditOldValue)
  | extend ExpectedVersion2 = extract(@'(expectedVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 3, AuditOldValue)
  | extend NewVersion1 = extract(@'("currentVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 2, AuditNewValue)
  | extend NewVersion2 = extract(@'("currentVersion":")([0-9]+)\.([0-9]+\.[0-9]+)', 3, AuditNewValue)
  | extend Comparision1 = iff(tolong(ExpectedVersion2) > tolong(NewVersion2), 'Unexpected version', 'Expected version')
  | extend VersionCheck = iff(tolong(ExpectedVersion1) > tolong(NewVersion1), 'Unexpected version', Comparision1)
  | project-away ExpectedVersion1, ExpectedVersion2, NewVersion1, NewVersion2, Comparision1
  | extend ProcessCustomEntity = AuditOperationType  
kind: Scheduled
triggerThreshold: 0
id: 672e2846-4226-11ec-81d3-0242ac130003
{
  "$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/672e2846-4226-11ec-81d3-0242ac130003')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/672e2846-4226-11ec-81d3-0242ac130003')]",
      "properties": {
        "alertRuleTemplateName": "672e2846-4226-11ec-81d3-0242ac130003",
        "customDetails": null,
        "description": "'Detects unexpected version of update operation.'\n",
        "displayName": "Zscaler - Unexpected update operation",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "ProcessCustomEntity",
                "identifier": "ProcessId"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Zscaler Private Access (ZPA)/Analytic Rules/ZscalerUnexpectedUpdateOperation.yaml",
        "query": "ZPAEvent\n| where isnotempty(AuditOperationType)\n| extend ExpectedVersion1 = extract(@'(expectedVersion\":\")([0-9]+)\\.([0-9]+\\.[0-9]+)', 2, AuditOldValue)\n| extend ExpectedVersion2 = extract(@'(expectedVersion\":\")([0-9]+)\\.([0-9]+\\.[0-9]+)', 3, AuditOldValue)\n| extend NewVersion1 = extract(@'(\"currentVersion\":\")([0-9]+)\\.([0-9]+\\.[0-9]+)', 2, AuditNewValue)\n| extend NewVersion2 = extract(@'(\"currentVersion\":\")([0-9]+)\\.([0-9]+\\.[0-9]+)', 3, AuditNewValue)\n| extend Comparision1 = iff(tolong(ExpectedVersion2) > tolong(NewVersion2), 'Unexpected version', 'Expected version')\n| extend VersionCheck = iff(tolong(ExpectedVersion1) > tolong(NewVersion1), 'Unexpected version', Comparision1)\n| project-away ExpectedVersion1, ExpectedVersion2, NewVersion1, NewVersion2, Comparision1\n| extend ProcessCustomEntity = AuditOperationType\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}