Detection rules › Kusto

Theom - Dark Data with large fin value

This is a third-party alert feed, not a detection over modeled telemetry. The vendor product raised the finding; this rule forwards it into the SIEM. It is searchable for reference but is excluded from the detection-rule browse and the ATT&CK coverage matrix.

Status: available
Severity: high
Time window: 5m
Source: github.com/Azure/Azure-Sentinel

"Creates Sentinel incidents for critical/high Theom risks, associated with ruleId TRIS0032 (Theom has observed data with a large financial value, but that has not been accessed recently. Use this information to enforce data retention policies)"

MITRE ATT&CK coverage

Tactic	Techniques
Collection	`T1530` Data from Cloud Storage `T1560` Archive Collected Data

Rule body

id: 545fdcc7-2123-4b8a-baf6-409f29aad4b1
name: Theom - Dark Data with large fin value
description: |
   "Creates Sentinel incidents for critical/high Theom risks, associated with ruleId TRIS0032 (Theom has observed data with a large financial value, but that has not been accessed recently. Use this information to enforce data retention policies)"
severity: High
status : Available
requiredDataConnectors: 
  - connectorId: Theom
    dataTypes:
      - TheomAlerts_CL
queryPeriod: 5m
queryFrequency: 5m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Collection
relevantTechniques:
  - T1560
  - T1530
query: |
   TheomAlerts_CL
     | where customProps_RuleId_s == "TRIS0032" and (priority_s == "P1" or priority_s == "P2")
eventGroupingSettings:
  aggregationKind: AlertPerResult
alertDetailsOverride:
  alertDisplayNameFormat: "Theom Alert ID: {{id_s}} "
  alertDescriptionFormat: "\nSummary: {{summary_s}}  \nAdditional info: {{details_s}}\nPlease investigate further on Theom UI at {{deepLink_s}}\n"
entityMappings:
  - entityType: CloudApplication
    fieldMappings:
      - identifier: Name
        columnName: customProps_AssetName_s
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: deepLink_s
version: 1.0.2
kind: Scheduled

Stages and Predicates

Stage 1: `source`

TheomAlerts_CL

Stage 2: `where`

| where customProps_RuleId_s == "TRIS0032" and (priority_s == "P1" or priority_s == "P2")

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`customProps_RuleId_s`	eq	`TRIS0032`	`field:"customProps_RuleId_s" kind:eq value:"TRIS0032"`
`priority_s`	eq	`P1` `P2`	`field:"priority_s" kind:eq`