NGINX - Multiple user agents for single source
Id | 83a0b48f-1cb7-4b4f-a018-23c3203a239b |
Rulename | NGINX - Multiple user agents for single source |
Description | Detects requests with different user agents from one source in short timeframe. |
Severity | Medium |
Tactics | InitialAccess |
Techniques | T1190 T1133 |
Required data connectors | CustomLogsAma NGINXHTTPServer |
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/NGINX HTTP Server/Analytic Rules/NGINXDifferentUAsFromSingleIP.yaml |
Version | 1.0.1 |
Arm template | 83a0b48f-1cb7-4b4f-a018-23c3203a239b.json |
let threshold = 5;
NGINXHTTPServer
| summarize makeset(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
| extend ua_count = array_length(set_HttpUserAgentOriginal)
| where ua_count > threshold
| extend IPCustomEntity = SrcIpAddr
kind: Scheduled
relevantTechniques:
- T1190
- T1133
description: |
'Detects requests with different user agents from one source in short timeframe.'
queryPeriod: 1h
queryFrequency: 1h
tactics:
- InitialAccess
name: NGINX - Multiple user agents for single source
requiredDataConnectors:
- connectorId: NGINXHTTPServer
dataTypes:
- NGINXHTTPServer
- connectorId: CustomLogsAma
dataTypes:
- NGINX_CL
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
triggerThreshold: 0
version: 1.0.1
id: 83a0b48f-1cb7-4b4f-a018-23c3203a239b
query: |
let threshold = 5;
NGINXHTTPServer
| summarize makeset(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)
| extend ua_count = array_length(set_HttpUserAgentOriginal)
| where ua_count > threshold
| extend IPCustomEntity = SrcIpAddr
status: Available
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXDifferentUAsFromSingleIP.yaml
severity: Medium
{
"$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/83a0b48f-1cb7-4b4f-a018-23c3203a239b')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/83a0b48f-1cb7-4b4f-a018-23c3203a239b')]",
"properties": {
"alertRuleTemplateName": "83a0b48f-1cb7-4b4f-a018-23c3203a239b",
"customDetails": null,
"description": "'Detects requests with different user agents from one source in short timeframe.'\n",
"displayName": "NGINX - Multiple user agents for single source",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPCustomEntity",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/NGINX HTTP Server/Analytic Rules/NGINXDifferentUAsFromSingleIP.yaml",
"query": "let threshold = 5;\nNGINXHTTPServer\n| summarize makeset(HttpUserAgentOriginal) by SrcIpAddr, bin(TimeGenerated, 5m)\n| extend ua_count = array_length(set_HttpUserAgentOriginal)\n| where ua_count > threshold\n| extend IPCustomEntity = SrcIpAddr\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1133",
"T1190"
],
"templateVersion": "1.0.1",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}