Microsoft Sentinel Analytic Rules
cloudbrothers.infoAzure Sentinel RepoToggle Dark/Light/Auto modeToggle Dark/Light/Auto modeToggle Dark/Light/Auto modeBack to homepage

OracleDBAudit - Multiple tables dropped in short time

Back
Idb3aa0e5a-75a2-4613-80ec-93a1be3aeb8f
RulenameOracleDBAudit - Multiple tables dropped in short time
DescriptionDetects when user drops many tables in short period of time.
SeverityMedium
TacticsImpact
TechniquesT1485
Required data connectorsSyslogAma
KindScheduled
Query frequency30m
Query period30m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditDropManyTables.yaml
Version1.0.2
Arm templateb3aa0e5a-75a2-4613-80ec-93a1be3aeb8f.json
Deploy To Azure
let tbl_threshold = 10;
OracleDatabaseAuditEvent
| where isnotempty(DstUserName)
| where DbAction =~ 'DROP'
| extend TableName = replace(@'[,\(\)]', '', extract(@'(?i)SELECT(.*?)FROM\s(.*?)\s', 2, Action))
| where isnotempty(TableName)
| where TableName !~ 'SELECT'
| summarize tbl_count = dcount(TableName) by DstUserName
| where tbl_count > tbl_threshold
| extend AccountCustomEntity = DstUserName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditDropManyTables.yaml
query: |
  let tbl_threshold = 10;
  OracleDatabaseAuditEvent
  | where isnotempty(DstUserName)
  | where DbAction =~ 'DROP'
  | extend TableName = replace(@'[,\(\)]', '', extract(@'(?i)SELECT(.*?)FROM\s(.*?)\s', 2, Action))
  | where isnotempty(TableName)
  | where TableName !~ 'SELECT'
  | summarize tbl_count = dcount(TableName) by DstUserName
  | where tbl_count > tbl_threshold
  | extend AccountCustomEntity = DstUserName  
description: |
    'Detects when user drops many tables in short period of time.'
severity: Medium
requiredDataConnectors:
- datatypes:
  - Syslog
  connectorId: SyslogAma
name: OracleDBAudit - Multiple tables dropped in short time
triggerThreshold: 0
tactics:
- Impact
version: 1.0.2
relevantTechniques:
- T1485
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
id: b3aa0e5a-75a2-4613-80ec-93a1be3aeb8f
status: Available
kind: Scheduled
queryFrequency: 30m
queryPeriod: 30m
{
  "$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/b3aa0e5a-75a2-4613-80ec-93a1be3aeb8f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b3aa0e5a-75a2-4613-80ec-93a1be3aeb8f')]",
      "properties": {
        "alertRuleTemplateName": "b3aa0e5a-75a2-4613-80ec-93a1be3aeb8f",
        "customDetails": null,
        "description": "'Detects when user drops many tables in short period of time.'\n",
        "displayName": "OracleDBAudit - Multiple tables dropped in short time",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditDropManyTables.yaml",
        "query": "let tbl_threshold = 10;\nOracleDatabaseAuditEvent\n| where isnotempty(DstUserName)\n| where DbAction =~ 'DROP'\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\n| where tbl_count > tbl_threshold\n| extend AccountCustomEntity = DstUserName\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1485"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}