let threshold = 100;
SymantecProxySG
| where sc_filter_result =~ "DENIED"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by c_ip, cs_host
| where count_ > threshold
| extend timestamp = StartTime, HostCustomEntity = cs_host, IPCustomEntity = c_ip
version: 1.0.1
status: Available
queryFrequency: 1h
requiredDataConnectors:
- connectorId: SymantecProxySG
dataTypes:
- Syslog
entityMappings:
- fieldMappings:
- columnName: HostCustomEntity
identifier: FullName
entityType: Host
- fieldMappings:
- columnName: IPCustomEntity
identifier: Address
entityType: IP
kind: Scheduled
queryPeriod: 1h
severity: Low
query: |
let threshold = 100;
SymantecProxySG
| where sc_filter_result =~ "DENIED"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by c_ip, cs_host
| where count_ > threshold
| extend timestamp = StartTime, HostCustomEntity = cs_host, IPCustomEntity = c_ip
triggerOperator: gt
id: 7a58b253-0ef2-4248-b4e5-c350f15a8346
description: |
'This alert creates an incident when a client generates an excessive amounts of denied proxy traffic.'
triggerThreshold: 0
name: Excessive Denied Proxy Traffic
tactics:
- DefenseEvasion
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SymantecProxySG/Analytic Rules/ExcessiveDeniedProxyTraffic.yaml
{
"$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/7a58b253-0ef2-4248-b4e5-c350f15a8346')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7a58b253-0ef2-4248-b4e5-c350f15a8346')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "Excessive Denied Proxy Traffic",
"description": "'This alert creates an incident when a client generates an excessive amounts of denied proxy traffic.'\n",
"severity": "Low",
"enabled": true,
"query": "let threshold = 100;\nSymantecProxySG\n| where sc_filter_result =~ \"DENIED\"\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by c_ip, cs_host\n| where count_ > threshold\n| extend timestamp = StartTime, HostCustomEntity = cs_host, IPCustomEntity = c_ip\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"alertRuleTemplateName": "7a58b253-0ef2-4248-b4e5-c350f15a8346",
"customDetails": null,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"identifier": "Address",
"columnName": "IPCustomEntity"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SymantecProxySG/Analytic Rules/ExcessiveDeniedProxyTraffic.yaml",
"status": "Available",
"templateVersion": "1.0.1"
}
}
]
}