OracleDBAudit - Unusual user activity on multiple tables

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