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 connectorsSyslogAma
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml
Version1.0.2
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
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
triggerThreshold: 0
relevantTechniques:
- T1119
queryPeriod: 1h
version: 1.0.2
id: 75024e1c-26e7-4e73-821d-95e5decdd8db
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml
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  
status: Available
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
  entityType: Account
tactics:
- Collection
severity: Medium
name: OracleDBAudit - Unusual user activity on multiple tables
queryFrequency: 1h
triggerOperator: gt
kind: Scheduled
description: |
    'Detects when user queries many tables in short period of time.'
{
  "$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/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",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Collection"
        ],
        "techniques": [
          "T1119"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}