Netskope - Large Outbound Data Transfer / Sensitive Upload (DLP)

Requête originale, sans modification.

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