TI Map IP Entity to VMConnection

let dt_lookBack = 1h; // Look back 1 hour for VMConnection events
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 IndicatorType in ("ipv4-addr", "ipv6-addr", "network-traffic")
     | extend NetworkSourceIP = toupper(ObservableValue)
     | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  | where TimeGenerated >= ago(ioc_lookBack)
  | 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, "")
  | 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, ObservableValue
  | where IsActive and (ValidUntil > now() or isempty(ValidUntil));
// Perform a join between IP indicators and VMConnection events
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 (
      VMConnection
      | where TimeGenerated >= ago(dt_lookBack)
      | extend VMConnection_TimeGenerated = TimeGenerated
  )
  on $left.TI_ipEntity == $right.RemoteIp
  // Filter out VMConnection events that occurred after the expiration of the corresponding indicator
  | where VMConnection_TimeGenerated < ValidUntil
  // Group the results by IndicatorId and keep the VMConnection event with the latest timestamp
  | summarize VMConnection_TimeGenerated = arg_max(VMConnection_TimeGenerated, *) by Id, RemoteIp
  // Select the desired output fields
  | extend Description = tostring(parse_json(Data).description)
  | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
  | project VMConnection_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,
    TI_ipEntity, Computer, Direction, ProcessName, SourceIp, DestinationIp, RemoteIp, Protocol, DestinationPort, NetworkSourceIP, Type, Url
  | extend timestamp = VMConnection_TimeGenerated, HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

tactics:
- CommandAndControl
query: |
  let dt_lookBack = 1h; // Look back 1 hour for VMConnection events
  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 IndicatorType in ("ipv4-addr", "ipv6-addr", "network-traffic")
       | extend NetworkSourceIP = toupper(ObservableValue)
       | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
    | where TimeGenerated >= ago(ioc_lookBack)
    | 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, "")
    | 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, ObservableValue
    | where IsActive and (ValidUntil > now() or isempty(ValidUntil));
  // Perform a join between IP indicators and VMConnection events
  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 (
        VMConnection
        | where TimeGenerated >= ago(dt_lookBack)
        | extend VMConnection_TimeGenerated = TimeGenerated
    )
    on $left.TI_ipEntity == $right.RemoteIp
    // Filter out VMConnection events that occurred after the expiration of the corresponding indicator
    | where VMConnection_TimeGenerated < ValidUntil
    // Group the results by IndicatorId and keep the VMConnection event with the latest timestamp
    | summarize VMConnection_TimeGenerated = arg_max(VMConnection_TimeGenerated, *) by Id, RemoteIp
    // Select the desired output fields
    | extend Description = tostring(parse_json(Data).description)
    | extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
    | project VMConnection_TimeGenerated, Description, ActivityGroupNames, Id, ValidUntil, Confidence,
      TI_ipEntity, Computer, Direction, ProcessName, SourceIp, DestinationIp, RemoteIp, Protocol, DestinationPort, NetworkSourceIP, Type, Url
    | extend timestamp = VMConnection_TimeGenerated, HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))  
requiredDataConnectors:
- dataTypes:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligence
- dataTypes:
  - ThreatIntelIndicators
  connectorId: ThreatIntelligenceTaxii
- dataTypes:
  - ThreatIntelIndicators
  connectorId: MicrosoftDefenderThreatIntelligence
- dataTypes:
  - VMConnection
  connectorId: AzureMonitor(VMInsights)
name: TI Map IP Entity to VMConnection
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/IPEntity_VMConnection.yaml
triggerThreshold: 0
description: |
    This query maps any IP indicators of compromise (IOCs) from threat intelligence (TI), by searching for matches in VMConnection.
version: 1.4.6
kind: Scheduled
queryFrequency: 1h
severity: Medium
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: DnsDomain
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: RemoteIp
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: Url
triggerOperator: gt
id: aed70d71-adb2-4f73-becd-02150b13950b
relevantTechniques:
- T1071