Brute force attack against user credentials (Uses Authentication Normalization)
Id | a6c435a2-b1a0-466d-b730-9f8af69262e8 |
Rulename | Brute force attack against user credentials (Uses Authentication Normalization) |
Description | Identifies evidence of brute force activity against a user based on multiple authentication failures and at least one successful authentication within a given time window. Note that the query does not enforce any sequence, and does not require the successful authentication to occur last. The default failure threshold is 10, success threshold is 1, and the default time window is 20 minutes. To use this analytics rule, make sure you have deployed the ASIM normalization parsers |
Severity | Medium |
Tactics | CredentialAccess |
Techniques | T1110 |
Kind | Scheduled |
Query frequency | 20m |
Query period | 20m |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimAuthentication/imAuthBruteForce.yaml |
Version | 1.2.2 |
Arm template | a6c435a2-b1a0-466d-b730-9f8af69262e8.json |
let failureCountThreshold = 10;
let successCountThreshold = 1;
// let authenticationWindow = 20m; // Implicit in the analytic rule query period
imAuthentication
| where TargetUserType != "NonInteractive"
| summarize
StartTime = min(TimeGenerated),
EndTime = max(TimeGenerated),
IpAddresses = make_set (SrcDvcIpAddr, 100),
ReportedBy = make_set (strcat (EventVendor, "/", EventProduct), 100),
FailureCount = countif(EventResult=='Failure'),
SuccessCount = countif(EventResult=='Success')
by
TargetUserId, TargetUsername, TargetUserType
| where FailureCount >= failureCountThreshold and SuccessCount >= successCountThreshold
| extend
IpAddresses = strcat_array(IpAddresses, ", "),
ReportedBy = strcat_array(ReportedBy, ", ")
requiredDataConnectors: []
triggerOperator: gt
queryFrequency: 20m
name: Brute force attack against user credentials (Uses Authentication Normalization)
tags:
- version: 1.0.0
Id: 28b42356-45af-40a6-a0b4-a554cdfd5d8a
- SchemaVersion: 0.1.0
Schema: ASIMAuthentication
queryPeriod: 20m
metadata:
categories:
domains:
- Security - Others
- Identity
support:
tier: Community
author:
name: Ofer Shezaf
source:
kind: Community
id: a6c435a2-b1a0-466d-b730-9f8af69262e8
description: |
'Identifies evidence of brute force activity against a user based on multiple authentication failures
and at least one successful authentication within a given time window. Note that the query does not enforce any sequence,
and does not require the successful authentication to occur last.
The default failure threshold is 10, success threshold is 1, and the default time window is 20 minutes.
To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimAuthentication)'
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimAuthentication/imAuthBruteForce.yaml
query: |
let failureCountThreshold = 10;
let successCountThreshold = 1;
// let authenticationWindow = 20m; // Implicit in the analytic rule query period
imAuthentication
| where TargetUserType != "NonInteractive"
| summarize
StartTime = min(TimeGenerated),
EndTime = max(TimeGenerated),
IpAddresses = make_set (SrcDvcIpAddr, 100),
ReportedBy = make_set (strcat (EventVendor, "/", EventProduct), 100),
FailureCount = countif(EventResult=='Failure'),
SuccessCount = countif(EventResult=='Success')
by
TargetUserId, TargetUsername, TargetUserType
| where FailureCount >= failureCountThreshold and SuccessCount >= successCountThreshold
| extend
IpAddresses = strcat_array(IpAddresses, ", "),
ReportedBy = strcat_array(ReportedBy, ", ")
version: 1.2.2
kind: Scheduled
customDetails:
ReportedBy: ReportedBy
IpAddresses: IpAddresses
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: TargetUsername
relevantTechniques:
- T1110
tactics:
- CredentialAccess
triggerThreshold: 0
{
"$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/a6c435a2-b1a0-466d-b730-9f8af69262e8')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a6c435a2-b1a0-466d-b730-9f8af69262e8')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Brute force attack against user credentials (Uses Authentication Normalization)",
"description": "'Identifies evidence of brute force activity against a user based on multiple authentication failures \nand at least one successful authentication within a given time window. Note that the query does not enforce any sequence,\nand does not require the successful authentication to occur last.\nThe default failure threshold is 10, success threshold is 1, and the default time window is 20 minutes.\nTo use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimAuthentication)'\n",
"severity": "Medium",
"enabled": true,
"query": "let failureCountThreshold = 10;\nlet successCountThreshold = 1;\n// let authenticationWindow = 20m; // Implicit in the analytic rule query period \nimAuthentication\n| where TargetUserType != \"NonInteractive\"\n| summarize \n StartTime = min(TimeGenerated), \n EndTime = max(TimeGenerated), \n IpAddresses = make_set (SrcDvcIpAddr, 100),\n ReportedBy = make_set (strcat (EventVendor, \"/\", EventProduct), 100),\n FailureCount = countif(EventResult=='Failure'),\n SuccessCount = countif(EventResult=='Success')\n by \n TargetUserId, TargetUsername, TargetUserType \n| where FailureCount >= failureCountThreshold and SuccessCount >= successCountThreshold\n| extend\n IpAddresses = strcat_array(IpAddresses, \", \"), \n ReportedBy = strcat_array(ReportedBy, \", \")\n",
"queryFrequency": "PT20M",
"queryPeriod": "PT20M",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1110"
],
"alertRuleTemplateName": "a6c435a2-b1a0-466d-b730-9f8af69262e8",
"customDetails": {
"IpAddresses": "IpAddresses",
"ReportedBy": "ReportedBy"
},
"entityMappings": [
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "TargetUsername"
}
],
"entityType": "Account"
}
],
"templateVersion": "1.2.2",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ASimAuthentication/imAuthBruteForce.yaml",
"tags": [
{
"Id": "28b42356-45af-40a6-a0b4-a554cdfd5d8a",
"version": "1.0.0"
},
{
"Schema": "ASIMAuthentication",
"SchemaVersion": "0.1.0"
}
]
}
}
]
}