Netskope - Large Outbound Data Transfer Sensitive Upload DLP

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Id	71e6586e-0d3f-4e33-b390-faa50b5e08fa
Rulename	Netskope - Large Outbound Data Transfer / Sensitive Upload (DLP)
Description	Detects large outbound data transfers and sensitive file uploads. Monitors for potential data exfiltration via cloud applications.
Severity	High
Tactics	Exfiltration
Techniques	T1567 T1048
Required data connectors	NetskopeWebTxConnector
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NetskopeWebTx/Analytic Rules/NetskopeWebtx_Rule6.yaml
Version	1.0.0
Arm template	71e6586e-0d3f-4e33-b390-faa50b5e08fa.json

KQL

let uploadThresholdMB = 100;
NetskopeWebTransactions_CL
| where TimeGenerated > ago(1h)
| where isnotempty(CsUsername)
| where XCsAppActivity =~ 'Upload' or XCsAppActivity =~ 'Post' or XCsAppActivity =~ 'Share' 
    or CsMethod =~ 'POST' or CsMethod =~ 'PUT'
| where CsBytes > 0 or XRsFileSize > 0
| extend UploadBytes = coalesce(CsBytes, XRsFileSize, 0)
| summarize 
    TotalUploadBytes = sum(UploadBytes),
    FileCount = dcount(XCsAppObjectName),
    Files = make_set(XCsAppObjectName, 10),
    FileTypes = make_set(XRsFileType),
    Apps = make_set(XCsApp),
    Destinations = make_set(XCsAppInstanceName),
    Countries = make_set(XSCountry)
    by CsUsername, XCDevice, XCCountry, bin(TimeGenerated, 1h)
| extend TotalUploadMB = round(TotalUploadBytes / 1048576.0, 2)
| where TotalUploadMB > uploadThresholdMB
| extend AlertSeverity = case(
    TotalUploadMB > 1000, 'Critical',
    TotalUploadMB > 500, 'High',
    TotalUploadMB > 100, 'Medium',
    'Low')
| project 
    TimeGenerated,
    User = CsUsername,
    UploadVolumeMB = TotalUploadMB,
    FileCount,
    Files,
    FileTypes,
    Applications = Apps,
    DestinationInstances = Destinations,
    SourceCountry = XCCountry,
    DestinationCountries = Countries,
    Device = XCDevice,
    AlertSeverity

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NetskopeWebTx/Analytic Rules/NetskopeWebtx_Rule6.yaml
query: |
  let uploadThresholdMB = 100;
  NetskopeWebTransactions_CL
  | where TimeGenerated > ago(1h)
  | where isnotempty(CsUsername)
  | where XCsAppActivity =~ 'Upload' or XCsAppActivity =~ 'Post' or XCsAppActivity =~ 'Share' 
      or CsMethod =~ 'POST' or CsMethod =~ 'PUT'
  | where CsBytes > 0 or XRsFileSize > 0
  | extend UploadBytes = coalesce(CsBytes, XRsFileSize, 0)
  | summarize 
      TotalUploadBytes = sum(UploadBytes),
      FileCount = dcount(XCsAppObjectName),
      Files = make_set(XCsAppObjectName, 10),
      FileTypes = make_set(XRsFileType),
      Apps = make_set(XCsApp),
      Destinations = make_set(XCsAppInstanceName),
      Countries = make_set(XSCountry)
      by CsUsername, XCDevice, XCCountry, bin(TimeGenerated, 1h)
  | extend TotalUploadMB = round(TotalUploadBytes / 1048576.0, 2)
  | where TotalUploadMB > uploadThresholdMB
  | extend AlertSeverity = case(
      TotalUploadMB > 1000, 'Critical',
      TotalUploadMB > 500, 'High',
      TotalUploadMB > 100, 'Medium',
      'Low')
  | project 
      TimeGenerated,
      User = CsUsername,
      UploadVolumeMB = TotalUploadMB,
      FileCount,
      Files,
      FileTypes,
      Applications = Apps,
      DestinationInstances = Destinations,
      SourceCountry = XCCountry,
      DestinationCountries = Countries,
      Device = XCDevice,
      AlertSeverity  
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: User
kind: Scheduled
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - NetskopeWebTransactions_CL
  connectorId: NetskopeWebTxConnector
tactics:
- Exfiltration
triggerThreshold: 0
description: |
    Detects large outbound data transfers and sensitive file uploads. Monitors for potential data exfiltration via cloud applications.
queryPeriod: 1h
version: 1.0.0
queryFrequency: 1h
severity: High
name: Netskope - Large Outbound Data Transfer / Sensitive Upload (DLP)
id: 71e6586e-0d3f-4e33-b390-faa50b5e08fa
status: Available
relevantTechniques:
- T1567
- T1048

ARM