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
severity: Medium
relevantTechniques:
- T1119
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
status: Available
triggerThreshold: 0
description: |
    'Detects when user queries many tables in short period of time.'
triggerOperator: gt
name: OracleDBAudit - Unusual user activity on multiple tables
queryFrequency: 1h
version: 1.0.2
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  
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
tactics:
- Collection
queryPeriod: 1h
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditSelectOnManyTables.yaml
id: 75024e1c-26e7-4e73-821d-95e5decdd8db
{
  "$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"
    }
  ]
}