let f_cnt_upload_threshold = 5;
let f_upload_size_threshold = 5000000;
CiscoWSAEvent
| where HttpRequestMethod in~ ('POST', 'PUT')
| where isnotempty(AmpFileName)
| where UrlCategory in~ ('IW_fts', 'IW_osb')
| where DstBytes > f_upload_size_threshold
| summarize count() by AmpFileName, SrcUserName, bin(TimeGenerated, 10m)
| where count_ >= f_cnt_upload_threshold
| extend AccountCustomEntity = SrcUserName
severity: High
queryFrequency: 1h
relevantTechniques:
- T1567
tactics:
- Exfiltration
kind: Scheduled
query: |
let f_cnt_upload_threshold = 5;
let f_upload_size_threshold = 5000000;
CiscoWSAEvent
| where HttpRequestMethod in~ ('POST', 'PUT')
| where isnotempty(AmpFileName)
| where UrlCategory in~ ('IW_fts', 'IW_osb')
| where DstBytes > f_upload_size_threshold
| summarize count() by AmpFileName, SrcUserName, bin(TimeGenerated, 10m)
| where count_ >= f_cnt_upload_threshold
| extend AccountCustomEntity = SrcUserName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSADataExfiltration.yaml
queryPeriod: 1h
status: Available
version: 1.0.1
name: Cisco WSA - Unexpected uploads
requiredDataConnectors:
- dataTypes:
- CiscoWSAEvent
connectorId: CiscoWSA
triggerOperator: gt
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
id: 32c460ad-2d40-43e9-8ead-5cdd1d7a3163
description: |
'Detects unexpected file uploads.'
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/32c460ad-2d40-43e9-8ead-5cdd1d7a3163')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/32c460ad-2d40-43e9-8ead-5cdd1d7a3163')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Cisco WSA - Unexpected uploads",
"description": "'Detects unexpected file uploads.'\n",
"severity": "High",
"enabled": true,
"query": "let f_cnt_upload_threshold = 5;\nlet f_upload_size_threshold = 5000000;\nCiscoWSAEvent\n| where HttpRequestMethod in~ ('POST', 'PUT')\n| where isnotempty(AmpFileName)\n| where UrlCategory in~ ('IW_fts', 'IW_osb')\n| where DstBytes > f_upload_size_threshold\n| summarize count() by AmpFileName, SrcUserName, bin(TimeGenerated, 10m)\n| where count_ >= f_cnt_upload_threshold\n| extend AccountCustomEntity = SrcUserName\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Exfiltration"
],
"techniques": [
"T1567"
],
"alertRuleTemplateName": "32c460ad-2d40-43e9-8ead-5cdd1d7a3163",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "Name"
}
],
"entityType": "Account"
}
],
"templateVersion": "1.0.1",
"status": "Available",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic Rules/CiscoWSADataExfiltration.yaml"
}
}
]
}