GSA - TI IP Entity

Back


Id	3ebd25b1-6f54-49f9-b5a5-0246357ce4ca
Rulename	GSA - TI IP Entity
Description	This query identifies IP indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in GSA NetworkAccessTraffic.
Severity	Medium
Tactics	CommandAndControl
Techniques	T1071
Required data connectors	AzureActiveDirectory
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/GSA - TI IP Entity.yaml
Arm template	3ebd25b1-6f54-49f9-b5a5-0246357ce4ca.json

KQL

let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let NetworkAccessTraffic_ =
    NetworkAccessTraffic
    | where TimeGenerated >= ago(dt_lookBack)
    | where TrafficType == "internet"
    | project-rename GSANetworkAccessTraffic_TimeGenerated = TimeGenerated;
let IPList = NetworkAccessTraffic_ | summarize by DestinationIp;
ThreatIntelIndicators
| project-rename TI_ipEntity = ObservableValue
| extend IndicatorType = replace(@'\[|\]|"""', "", tostring(split(ObservableKey, ":", 0)))
| where IndicatorType in ("ipv4-addr", "network-traffic")
| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
| where TimeGenerated >= ago(ioc_lookBack)
| where TI_ipEntity in (IPList)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, TI_ipEntity
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| extend Description = tostring(parse_json(Data).description)
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| join kind=innerunique (NetworkAccessTraffic_) on $left.TI_ipEntity == $right.DestinationIp
| extend GSAThreatType = ThreatType
| summarize GSANetworkAccessTraffic_TimeGenerated = arg_max(GSANetworkAccessTraffic_TimeGenerated, *) by Id, DestinationIp
| project-reorder *,
    Tags,
    Confidence,
    TrafficLightProtocolLevel,
    Type,
    TI_ipEntity,
    UserPrincipalName,
    UserId,
    DeviceId,
    InitiatingProcessName,
    GSAThreatType,
    DestinationFqdn,
    DestinationUrl,
    DestinationPort,
    SourceIp,
    SourcePort,
    HttpUserAgent

YAML

kind: Scheduled
queryFrequency: 1h
queryPeriod: 14d
status: Available
tactics:
- CommandAndControl
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Global Secure Access/Analytic Rules/GSA - TI IP Entity.yaml
triggerThreshold: 0
description: |
    This query identifies IP indicators of compromise (IOCs) from threat intelligence (TI) by searching for matches in GSA NetworkAccessTraffic.
severity: Medium
relevantTechniques:
- T1071
id: 3ebd25b1-6f54-49f9-b5a5-0246357ce4ca
name: GSA - TI IP Entity
requiredDataConnectors:
- dataTypes:
  - NetworkAccessTrafficLogs
  connectorId: AzureActiveDirectory
query: |
  let dt_lookBack = 1h;
  let ioc_lookBack = 14d;
  let NetworkAccessTraffic_ =
      NetworkAccessTraffic
      | where TimeGenerated >= ago(dt_lookBack)
      | where TrafficType == "internet"
      | project-rename GSANetworkAccessTraffic_TimeGenerated = TimeGenerated;
  let IPList = NetworkAccessTraffic_ | summarize by DestinationIp;
  ThreatIntelIndicators
  | project-rename TI_ipEntity = ObservableValue
  | extend IndicatorType = replace(@'\[|\]|"""', "", tostring(split(ObservableKey, ":", 0)))
  | where IndicatorType in ("ipv4-addr", "network-traffic")
  | extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
  | where TimeGenerated >= ago(ioc_lookBack)
  | where TI_ipEntity in (IPList)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, TI_ipEntity
  | where IsActive and (ValidUntil > now() or isempty(ValidUntil))
  | extend Description = tostring(parse_json(Data).description)
  | where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
  | join kind=innerunique (NetworkAccessTraffic_) on $left.TI_ipEntity == $right.DestinationIp
  | extend GSAThreatType = ThreatType
  | summarize GSANetworkAccessTraffic_TimeGenerated = arg_max(GSANetworkAccessTraffic_TimeGenerated, *) by Id, DestinationIp
  | project-reorder *,
      Tags,
      Confidence,
      TrafficLightProtocolLevel,
      Type,
      TI_ipEntity,
      UserPrincipalName,
      UserId,
      DeviceId,
      InitiatingProcessName,
      GSAThreatType,
      DestinationFqdn,
      DestinationUrl,
      DestinationPort,
      SourceIp,
      SourcePort,
      HttpUserAgent  
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: UserPrincipalName
  entityType: Account
- fieldMappings:
  - identifier: CommandLine
    columnName: InitiatingProcessName
  entityType: Process
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: AzureID
    columnName: DeviceId
  entityType: Host
triggerOperator: gt

ARM