let threshold = 15;
SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| summarize Total = count() by bin(TimeGenerated, 15m), User, ClientIP
| where Total > threshold
| extend timestamp = TimeGenerated, IPCustomEntity = ClientIP, AccountCustomEntity = User
kind: Scheduled
queryPeriod: 1h
description: |
'Creates an incident in the event that a user generates an excessive amount of failed authentications due to invalid inputs, indications of a potential brute force.'
tactics:
- CredentialAccess
id: c775a46b-21b1-46d7-afa6-37e3e577a27b
requiredDataConnectors:
- connectorId: SymantecVIP
dataTypes:
- Syslog
relevantTechniques:
- T1110
severity: Medium
version: 1.0.0
status: Available
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
name: Excessive Failed Authentication from Invalid Inputs
triggerOperator: gt
query: |2
let threshold = 15;
SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| summarize Total = count() by bin(TimeGenerated, 15m), User, ClientIP
| where Total > threshold
| extend timestamp = TimeGenerated, IPCustomEntity = ClientIP, AccountCustomEntity = User
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Symantec VIP/Analytic Rules/ExcessiveFailedAuthenticationsfromInvalidInputs.yaml
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/c775a46b-21b1-46d7-afa6-37e3e577a27b')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/c775a46b-21b1-46d7-afa6-37e3e577a27b')]",
"properties": {
"alertRuleTemplateName": "c775a46b-21b1-46d7-afa6-37e3e577a27b",
"customDetails": null,
"description": "'Creates an incident in the event that a user generates an excessive amount of failed authentications due to invalid inputs, indications of a potential brute force.'\n",
"displayName": "Excessive Failed Authentication from Invalid Inputs",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPCustomEntity",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Symantec VIP/Analytic Rules/ExcessiveFailedAuthenticationsfromInvalidInputs.yaml",
"query": "\nlet threshold = 15;\nSymantecVIP\n| where isnotempty(RADIUSAuth)\n| where RADIUSAuth =~ \"Reject\"\n| summarize Total = count() by bin(TimeGenerated, 15m), User, ClientIP\n| where Total > threshold\n| extend timestamp = TimeGenerated, IPCustomEntity = ClientIP, AccountCustomEntity = User\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1110"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}