Microsoft Sentinel Analytic Rules
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OracleDBAudit - Unusual user activity on multiple tables

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Id75024e1c-26e7-4e73-821d-95e5decdd8db
RulenameOracleDBAudit - Unusual user activity on multiple tables
DescriptionDetects when user queries many tables in short period of time.
SeverityMedium
TacticsCollection
TechniquesT1119
Required data connectorsOracleDatabaseAudit
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml
Version1.0.0
Arm template75024e1c-26e7-4e73-821d-95e5decdd8db.json
Deploy To Azure
let tbl_threshold = 10;
OracleDatabaseAuditEvent
| where isnotempty(DstUserName)
| where DbAction =~ 'SELECT'
| extend TableName = replace(@'[,\(\)]', '', extract(@'(?i)SELECT(.*?)FROM\s(.*?)\s', 2, Action))
| where isnotempty(TableName)
| where TableName !~ 'SELECT'
| summarize tbl_count = dcount(TableName) by DstUserName, bucket = bin(TimeGenerated, 5m)
| where tbl_count > tbl_threshold
| extend AccountCustomEntity = DstUserName
name: OracleDBAudit - Unusual user activity on multiple tables
triggerOperator: gt
status: Available
relevantTechniques:
- T1119
query: |
  let tbl_threshold = 10;
  OracleDatabaseAuditEvent
  | where isnotempty(DstUserName)
  | where DbAction =~ 'SELECT'
  | extend TableName = replace(@'[,\(\)]', '', extract(@'(?i)SELECT(.*?)FROM\s(.*?)\s', 2, Action))
  | where isnotempty(TableName)
  | where TableName !~ 'SELECT'
  | summarize tbl_count = dcount(TableName) by DstUserName, bucket = bin(TimeGenerated, 5m)
  | where tbl_count > tbl_threshold
  | extend AccountCustomEntity = DstUserName  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml
description: |
    'Detects when user queries many tables in short period of time.'
triggerThreshold: 0
id: 75024e1c-26e7-4e73-821d-95e5decdd8db
kind: Scheduled
severity: Medium
version: 1.0.0
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
queryFrequency: 1h
queryPeriod: 1h
requiredDataConnectors:
- dataTypes:
  - Syslog
  connectorId: OracleDatabaseAudit
tactics:
- Collection
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/75024e1c-26e7-4e73-821d-95e5decdd8db')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/75024e1c-26e7-4e73-821d-95e5decdd8db')]",
      "properties": {
        "alertRuleTemplateName": "75024e1c-26e7-4e73-821d-95e5decdd8db",
        "customDetails": null,
        "description": "'Detects when user queries many tables in short period of time.'\n",
        "displayName": "OracleDBAudit - Unusual user activity on multiple tables",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml",
        "query": "let tbl_threshold = 10;\nOracleDatabaseAuditEvent\n| where isnotempty(DstUserName)\n| where DbAction =~ 'SELECT'\n| extend TableName = replace(@'[,\\(\\)]', '', extract(@'(?i)SELECT(.*?)FROM\\s(.*?)\\s', 2, Action))\n| where isnotempty(TableName)\n| where TableName !~ 'SELECT'\n| summarize tbl_count = dcount(TableName) by DstUserName, bucket = bin(TimeGenerated, 5m)\n| where tbl_count > tbl_threshold\n| extend AccountCustomEntity = DstUserName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection"
        ],
        "techniques": [
          "T1119"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}