ClientDeniedAccess
Id | a9956d3a-07a9-44a6-a279-081a85020cae |
Rulename | ClientDeniedAccess |
Description | Creates an incident in the event a Client has an excessive amounts of denied access requests. |
Severity | Medium |
Tactics | CredentialAccess |
Techniques | T1110 |
Required data connectors | SymantecVIP SyslogAma |
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/Symantec VIP/Analytic Rules/ClientDeniedAccess.yaml |
Version | 1.0.2 |
Arm template | a9956d3a-07a9-44a6-a279-081a85020cae.json |
let threshold = 15;
let rejectedAccess = SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| summarize Total = count() by ClientIP, bin(TimeGenerated, 15m)
| where Total > threshold
| project ClientIP;
SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| join kind=inner rejectedAccess on ClientIP
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by ClientIP, User
| extend timestamp = StartTime, IPCustomEntity = ClientIP, AccountCustomEntity = User
query: |
let threshold = 15;
let rejectedAccess = SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| summarize Total = count() by ClientIP, bin(TimeGenerated, 15m)
| where Total > threshold
| project ClientIP;
SymantecVIP
| where isnotempty(RADIUSAuth)
| where RADIUSAuth =~ "Reject"
| join kind=inner rejectedAccess on ClientIP
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by ClientIP, User
| extend timestamp = StartTime, IPCustomEntity = ClientIP, AccountCustomEntity = User
queryFrequency: 1h
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
entityType: Account
- fieldMappings:
- identifier: Address
columnName: IPCustomEntity
entityType: IP
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Symantec VIP/Analytic Rules/ClientDeniedAccess.yaml
queryPeriod: 1h
kind: Scheduled
version: 1.0.2
triggerOperator: gt
tactics:
- CredentialAccess
relevantTechniques:
- T1110
name: ClientDeniedAccess
triggerThreshold: 0
severity: Medium
description: |
'Creates an incident in the event a Client has an excessive amounts of denied access requests.'
requiredDataConnectors:
- dataTypes:
- Syslog
connectorId: SymantecVIP
- datatypes:
- Syslog
connectorId: SyslogAma
status: Available
id: a9956d3a-07a9-44a6-a279-081a85020cae
{
"$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/a9956d3a-07a9-44a6-a279-081a85020cae')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a9956d3a-07a9-44a6-a279-081a85020cae')]",
"properties": {
"alertRuleTemplateName": "a9956d3a-07a9-44a6-a279-081a85020cae",
"customDetails": null,
"description": "'Creates an incident in the event a Client has an excessive amounts of denied access requests.'\n",
"displayName": "ClientDeniedAccess",
"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/ClientDeniedAccess.yaml",
"query": "let threshold = 15;\nlet rejectedAccess = SymantecVIP\n| where isnotempty(RADIUSAuth)\n| where RADIUSAuth =~ \"Reject\"\n| summarize Total = count() by ClientIP, bin(TimeGenerated, 15m)\n| where Total > threshold\n| project ClientIP;\nSymantecVIP\n| where isnotempty(RADIUSAuth)\n| where RADIUSAuth =~ \"Reject\"\n| join kind=inner rejectedAccess on ClientIP\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by ClientIP, User\n| extend timestamp = StartTime, IPCustomEntity = ClientIP, AccountCustomEntity = User\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1110"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}