BitSight - compromised systems detected

Status: available
Severity: medium
Time window: 1d
Source: github.com/Azure/Azure-Sentinel

'Rule helps to detect whenever there is a compromised systems found in BitSight.'

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1203` Exploitation for Client Execution

Rule body

id: d68b758a-b117-4cb8-8e1d-dcab5a4a2f21
name: BitSight - compromised systems detected
description: |
  'Rule helps to detect whenever there is a compromised systems found in BitSight.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: BitSight
    dataTypes:
      - BitSightFindingsData
queryFrequency: 1d
queryPeriod: 24h
triggerOperator: GreaterThan
triggerThreshold: 0
tactics:
  - Execution
relevantTechniques:
  - T1203
query: |
    let timeframe = 24h;
    BitSightFindingsData
    | where ingestion_time() > ago(timeframe)
    | where RiskCategory == "Compromised Systems"
    | extend Severity = toreal(Severity)
    | extend Severity = case( Severity <= 6.9 and Severity >= 4.0, "Low",
                              Severity <= 8.9 and Severity >= 7.0, "Medium",
                              Severity <= 10.0 and Severity >= 9.0, "High",
                              "Informational")
    | project FirstSeen, CompanyName, Severity, RiskCategory, RiskVector, TemporaryId
incidentConfiguration:
    createIncident: true
eventGroupingSettings:
    aggregationKind: AlertPerResult
alertDetailsOverride:
    alertDisplayNameFormat: 'BitSight: Alert for {{RiskVector}} in {{CompanyName}} from BitSight'
    alertDescriptionFormat: 'Alert is generated for {{CompanyName}}.\n\nRisk Vector: {{RiskVector}}\nTemporaryId: {{TemporaryId}}\nRisk Category: Compromised Systems'
    alertSeverityColumnName: Severity
entityMappings:
  - entityType: Malware
    fieldMappings:
      - identifier: Name
        columnName: RiskVector
      - identifier: Category
        columnName: RiskCategory
version: 1.0.2
kind: Scheduled

Stages and Predicates

Parameters

let timeframe = 24h;

Stage 1: `source`

BitSightFindingsData

Stage 2: `where`

| where ingestion_time() > ago(timeframe)

Stage 3: `where`

| where RiskCategory == "Compromised Systems"

Stage 4: `extend`

| extend Severity = toreal(Severity)

Stage 5: `extend`

| extend Severity = case( Severity <= 6.9 and Severity >= 4.0, "Low",
                          Severity <= 8.9 and Severity >= 7.0, "Medium",
                          Severity <= 10.0 and Severity >= 9.0, "High",
                          "Informational")

Severity =

ifSeverity <= 6.9 and Severity >= 4.0"Low"

elifSeverity <= 8.9 and Severity >= 7.0"Medium"

elifSeverity <= 10.0 and Severity >= 9.0"High"

else"Informational"

Stage 6: `project`

| project FirstSeen, CompanyName, Severity, RiskCategory, RiskVector, TemporaryId

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`RiskCategory`	eq	`Compromised Systems`	`field:"RiskCategory" kind:eq value:"Compromised Systems"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`CompanyName`	`project`
`FirstSeen`	`project`
`RiskCategory`	`project`
`RiskVector`	`project`
`Severity`	`project`
`TemporaryId`	`project`

BitSight - compromised systems detected

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: extend

Stage 5: extend

Stage 6: project