Vectra AI Detect - Suspected Compromised Host

id: 60eb6cf0-3fa1-44c1-b1fe-220fbee23d63
name: Vectra AI Detect - Suspected Compromised Host
description: |
  'Create an incident when a Host is suspected to be compromised. 
  The higher the severity level is, the more immediate attention it requires as Vectra AI engine is more confident that this is a real threat. 
  Level of severity are: Low, Medium, High, Critical). Recommended configuration is to trigger an alert for at least High and Critical.'
severity: Informational
status: Available
requiredDataConnectors:
  - connectorId: CefAma
    dataTypes:
      - CommonSecurityLog
queryFrequency: 5m
queryPeriod: 5m
triggerOperator: gt
triggerThreshold: 0
eventGroupingSettings:
  aggregationKind: AlertPerResult
tactics:
  - CredentialAccess
  - Discovery
  - LateralMovement
  - Collection
  - CommandAndControl
  - Exfiltration
  - Impact
relevantTechniques:
  - T1003
  - T1087
  - T1021
  - T1119
  - T1071
  - T1041
  - T1499
query: |
  // Edit this variable to only keep the Severity level where an incident needs to be created (Defaults are: "High", "Critical" ). Possible values are: "Low", "Medium", "High", "Critical"
  let configured_level = dynamic(["High", "Critical"]);
  CommonSecurityLog
  | where DeviceVendor == "Vectra Networks"
  | where DeviceProduct == "X Series"
  | where DeviceEventClassID == "hsc"
  | project-rename threat_score = FlexNumber1
  | project-rename certainty_score = FlexNumber2
  | project-rename vectra_URL = DeviceCustomString4
  | project-rename detection_name = DeviceEventClassID
  | project-rename score_decreases = DeviceCustomString3
  | extend level = case( threat_score <  50 and certainty_score < 50, "Low",
                        threat_score < 50 and certainty_score >= 50 , "Medium", 
                        threat_score >= 50 and certainty_score <= 50, "High", 
                        threat_score >= 50 and certainty_score >= 50, "Critical",
                        "UNKNOWN")
  | extend Severity = case(level == "Info", "Informational",level == "Critical", "High", level)
  | where level in (configured_level) 
  //keep only the event with the highest threat score per Host
  | summarize arg_max(TimeGenerated, *) by SourceHostName
  | sort by TimeGenerated
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: SourceHostName
alertDetailsOverride:
  alertDisplayNameFormat: Vectra AI Detect - Host {{SourceHostName}} reaches {{level}} severity
  alertDescriptionFormat: |
    The host {{SourceHostName}} has a Threat score of {{threat_score}} and a
    certainty of {{certainty_score}}
  alertSeverityColumnName: Severity
  alertDynamicProperties:
    - alertProperty: AlertLink
      value: vectra_URL
    - alertProperty: ProductName
      value: DeviceProduct
    - alertProperty: ProviderName
      value: DeviceVendor
    - alertProperty: ConfidenceScore
      value: certainty_score
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: true
    lookbackDuration: 7d
    matchingMethod: AllEntities
customDetails:
  ScoreDecrease: score_decreases
version: 1.0.9
kind: Scheduled