Solutions/Threat Intelligence (NEW)/Analytic Rules/IPEntity_DuoSecurity.yaml

id: 4988c238-a118-442c-80bd-6c689a1b2e97
name: TI Map IP Entity to Duo Security
description: |
  'This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in DuoSecurity.'
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: CiscoDuoSecurity
    dataTypes:
      - CiscoDuo
  - connectorId: MicrosoftDefenderThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
queryFrequency: 1h
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
relevantTechniques:
  - T1071
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  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 TimeGenerated >= ago(ioc_lookBack)
  // As there is potentially more than 1 indicator type for matching IP, taking NetworkIP first, then others if that is empty.
  // 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()
   | join (
       DuoSecurityAuthentication_CL
       | where TimeGenerated >= ago(dt_lookBack)
       | where isnotempty(access_device_ip_s)
       // renaming time column so it is clear the log this came from
       | extend Duo_TimeGenerated = isotimestamp_t
   )
   on $left.TI_ipEntity == $right.access_device_ip_s
   | where TimeGenerated >= ago(ioc_lookBack)
   | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
   | where IsActive == true and ValidUntil > now()
   | 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, Duo_TimeGenerated,
   TI_ipEntity, user_name_s, factor_s, result_s, application_name_s, event_type_s, txid_g, user_key_s, access_device_ip_s, access_device_location_city_s, access_device_location_state_s, access_device_location_country_s
   | extend timestamp = Duo_TimeGenerated, Name = tostring(split(user_name_s, '@', 0)[0]), UPNSuffix = tostring(split(user_name_s, '@', 1)[0])
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: user_name_s
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: access_device_ip_s
version: 1.0.7
kind: Scheduled