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.'
kind: Scheduled
tactics:
- Impact
requiredDataConnectors:
- connectorId: SyslogAma
datatypes:
- Syslog
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/OracleDatabaseAudit/Analytic Rules/OracleDBAuditDropManyTables.yaml
severity: Medium
name: OracleDBAudit - Multiple tables dropped in short time
triggerThreshold: 0
queryPeriod: 30m
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
relevantTechniques:
- T1485
id: b3aa0e5a-75a2-4613-80ec-93a1be3aeb8f
queryFrequency: 30m
status: Available
triggerOperator: gt
version: 1.0.2
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
