Cloudflare - Empty user agent
Id | 729c6d21-fad9-4a6a-9c7f-482393c95957 |
Rulename | Cloudflare - Empty user agent |
Description | Detects requests where user agent is empty. |
Severity | Medium |
Tactics | InitialAccess |
Techniques | T1190 T1133 |
Required data connectors | CloudflareDataConnector |
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/Cloudflare/Analytic Rules/CloudflareEmptyUA.yaml |
Version | 1.0.0 |
Arm template | 729c6d21-fad9-4a6a-9c7f-482393c95957.json |
Cloudflare
| where isempty(HttpUserAgentOriginal)
| extend IPCustomEntity = SrcIpAddr
queryPeriod: 1h
version: 1.0.0
tactics:
- InitialAccess
queryFrequency: 1h
id: 729c6d21-fad9-4a6a-9c7f-482393c95957
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
- Cloudflare
connectorId: CloudflareDataConnector
severity: Medium
entityMappings:
- entityType: IP
fieldMappings:
- columnName: IPCustomEntity
identifier: Address
triggerThreshold: 0
relevantTechniques:
- T1190
- T1133
query: |
Cloudflare
| where isempty(HttpUserAgentOriginal)
| extend IPCustomEntity = SrcIpAddr
kind: Scheduled
name: Cloudflare - Empty user agent
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareEmptyUA.yaml
description: |
'Detects requests where user agent is empty.'
status: Available
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/729c6d21-fad9-4a6a-9c7f-482393c95957')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/729c6d21-fad9-4a6a-9c7f-482393c95957')]",
"properties": {
"alertRuleTemplateName": "729c6d21-fad9-4a6a-9c7f-482393c95957",
"customDetails": null,
"description": "'Detects requests where user agent is empty.'\n",
"displayName": "Cloudflare - Empty user agent",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPCustomEntity",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cloudflare/Analytic Rules/CloudflareEmptyUA.yaml",
"query": "Cloudflare\n| where isempty(HttpUserAgentOriginal)\n| extend IPCustomEntity = SrcIpAddr\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1133",
"T1190"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}