BitSight - drop in company ratings

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Id	d8844f11-3a36-4b97-9062-1e6d57c00e37
Rulename	BitSight - drop in company ratings
Description	Rule helps to detect when there is a drop of 10% or more in BitSight company ratings.
Severity	High
Tactics	Reconnaissance CommandAndControl
Techniques	T1591 T1090
Required data connectors	BitSight
Kind	Scheduled
Query frequency	1d
Query period	24h
Trigger threshold	0
Trigger operator	GreaterThan
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/BitSight/Analytic Rules/BitSightDropInCompanyRatings.yaml
Version	1.0.2
Arm template	d8844f11-3a36-4b97-9062-1e6d57c00e37.json

KQL

let timeframe = 24h;
BitSightGraphData
| where ingestion_time() > ago(timeframe)and toint(RatingDifferance) < 0
| extend percentage = -(toreal(RatingDifferance)/toreal(Rating))*100
| where percentage >= 10
| project RatingDate, Rating, CompanyName, percentage

YAML

queryPeriod: 24h
kind: Scheduled
requiredDataConnectors:
- connectorId: BitSight
  dataTypes:
  - BitSightGraphData
description: |
    'Rule helps to detect when there is a drop of 10% or more in BitSight company ratings.'
queryFrequency: 1d
incidentConfiguration:
  createIncident: false
triggerOperator: GreaterThan
eventGroupingSettings:
  aggregationKind: AlertPerResult
query: |
  let timeframe = 24h;
  BitSightGraphData
  | where ingestion_time() > ago(timeframe)and toint(RatingDifferance) < 0
  | extend percentage = -(toreal(RatingDifferance)/toreal(Rating))*100
  | where percentage >= 10
  | project RatingDate, Rating, CompanyName, percentage  
name: BitSight - drop in company ratings
id: d8844f11-3a36-4b97-9062-1e6d57c00e37
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/BitSight/Analytic Rules/BitSightDropInCompanyRatings.yaml
severity: High
version: 1.0.2
status: Available
relevantTechniques:
- T1591
- T1090
alertDetailsOverride:
  alertDisplayNameFormat: 'BitSight : Alert for >10% drop in ratings of {{CompanyName}}.'
  alertDescriptionFormat: 'Alert is generated for {{CompanyName}}.\n\nRating Date: {{RatingDate}}\nPercentage Drop: {{percentage}}%'
triggerThreshold: 0
customDetails:
  CompanyName: CompanyName
  CompanyRating: Rating
tactics:
- Reconnaissance
- CommandAndControl

ARM