Solutions/Threat Intelligence (NEW)/Analytic Rules/Threat Intel Matches to GitHub Audit Logs.yaml

id: 43d6c173-64c8-4416-b32e-636a9f318d15
name: TI map IP entity to GitHub_CL
description: |
  'Identifies a match in GitHub_CL table from any IP IOC from TI'
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: MicrosoftDefenderThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let dt_lookBack = 1h; // Look back 1 hour for VMConnection events
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  ThreatIntelIndicators
  //extract key part of kv pair
       | extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
       | where isnotempty(IndicatorType) and IndicatorType == "ipv4-addr"
       | extend NetworkSourceIP = toupper(ObservableValue)
       | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  // Picking up only IOC's that contain the entities we want
  | where isnotempty(NetworkSourceIP)
  // | where Action == true
  | where TimeGenerated >= ago(ioc_lookBack)
  // Taking the first non-empty value based on potential IOC match availability
  | extend TI_ipEntity = iff(isnotempty(NetworkSourceIP), NetworkSourceIP, NetworkSourceIP)
  | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
  | where IsActive == true and ValidUntil > now()
    | project-reorder *, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity
  | join (
    GitHubAudit
    | where TimeGenerated >= ago(dt_lookBack)
    | extend GitHubAudit_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.IPaddress
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
  | project LatestIndicatorTime, Description, ActivityGroupNames, Id, ValidUntil, Confidence, GitHubAudit_TimeGenerated, TI_ipEntity, IPaddress, Actor, Action, Country, OperationType, NetworkSourceIP
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: Actor
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPaddress
version: 1.0.6
kind: Scheduled