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

id: 69f55be4-1b13-42d0-b975-a1e59c996dd2
name: TI map IP entity to AWSCloudTrail
description: |
  Identifies a match in AWSCloudTrail from any IP IOC from TI
severity: Medium
requiredDataConnectors:
  - connectorId: ThreatIntelligence
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: ThreatIntelligenceTaxii
    dataTypes:
      - ThreatIntelligenceIndicator
  - connectorId: AWS
    dataTypes:
      - AWSCloudTrail
  - 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 AWSCloudTrail logs
  let ioc_lookBack = 14d; // Look back 14 days for threat intelligence indicators
  // Fetch threat intelligence indicators related to IP addresses
  let IP_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)
    // Filter out indicators without relevant IP address fields
    | where isnotempty(NetworkSourceIP)
    | where TimeGenerated >= ago(ioc_lookBack)
    // Select the IP entity based on availability of different IP fields
    | extend TI_ipEntity = iff(isnotempty(NetworkSourceIP), NetworkSourceIP, NetworkSourceIP)
    | extend TI_ipEntity = iff(isempty(TI_ipEntity) and isnotempty(NetworkSourceIP), NetworkSourceIP, TI_ipEntity)
    | extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
    // Exclude local addresses using the ipv4_is_private operator and filtering out specific address prefixes
    | where ipv4_is_private(TI_ipEntity) == false and  TI_ipEntity !startswith "fe80" and TI_ipEntity !startswith "::" and TI_ipEntity !startswith "127."
    | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
    | where IsActive == true and ValidUntil > now();
  // Perform a join between IP indicators and AWSCloudTrail logs to identify potential malicious activity
  IP_Indicators
     | project-reorder *, Tags, TrafficLightProtocolLevel, NetworkSourceIP, Type, TI_ipEntity
    // Use innerunique to keep performance fast and result set low, as we only need one match to indicate potential malicious activity that needs investigation
    | join kind=innerunique (
        AWSCloudTrail
        | where TimeGenerated >= ago(dt_lookBack)
        | extend AWSCloudTrail_TimeGenerated = TimeGenerated // Rename time column for clarity
      )
      on $left.TI_ipEntity == $right.SourceIpAddress
    // Filter out logs that occurred after the expiration of the corresponding indicator
    | where AWSCloudTrail_TimeGenerated < ValidUntil
    // Group the results by IndicatorId and SourceIpAddress, and keep the log entry with the latest timestamp
    | summarize AWSCloudTrail_TimeGenerated = arg_max(AWSCloudTrail_TimeGenerated, *) by Id, SourceIpAddress
    // Select the desired output fields
    | extend Description = tostring(parse_json(Data).description)
    | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
    | project AWSCloudTrail_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,
      TI_ipEntity, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserIdentityUserName, SourceIpAddress,
      NetworkSourceIP, Url
    // Rename the timestamp field
    | extend timestamp = AWSCloudTrail_TimeGenerated
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: ObjectGuid
        columnName: UserIdentityUserName
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SourceIpAddress
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Url
version: 1.4.4
kind: Scheduled