Privileged User Logon from new ASN
Id | 55073036-bb86-47d3-a85a-b113ac3d9396 |
Rulename | Privileged User Logon from new ASN |
Description | Detects a successful logon by a privileged account from an ASN not logged in from in the last 14 days. Monitor these logons to ensure they are legitimate and identify if there are any similar sign ins. |
Severity | Medium |
Tactics | DefenseEvasion |
Techniques | T1078.004 |
Required data connectors | AzureActiveDirectory BehaviorAnalytics |
Kind | Scheduled |
Query frequency | 1d |
Query period | 7d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/PrivilegedUserLogonfromnewASN.yaml |
Version | 1.0.6 |
Arm template | 55073036-bb86-47d3-a85a-b113ac3d9396.json |
let admins=(IdentityInfo
| where AssignedRoles contains "admin" or GroupMembership has "Admin"
| summarize by tolower(AccountUPN));
let known_asns = (
SigninLogs
| where TimeGenerated between(ago(14d)..ago(1d))
| where ResultType == 0
| summarize by AutonomousSystemNumber);
SigninLogs
| where TimeGenerated > ago(1d)
| where ResultType == 0
| where tolower(UserPrincipalName) in (admins)
| where AutonomousSystemNumber !in (known_asns)
| project-reorder TimeGenerated, UserPrincipalName, UserAgent, IPAddress, AutonomousSystemNumber
| extend AccountName = tostring(split(UserPrincipalName, "@")[0]), AccountUPNSuffix = tostring(split(UserPrincipalName, "@")[1])
requiredDataConnectors:
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
- dataTypes:
- BehaviorAnalytics
connectorId: BehaviorAnalytics
- dataTypes:
- IdentityInfo
connectorId: BehaviorAnalytics
triggerThreshold: 0
relevantTechniques:
- T1078.004
queryPeriod: 7d
version: 1.0.6
tags:
- AADSecOpsGuide
id: 55073036-bb86-47d3-a85a-b113ac3d9396
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/PrivilegedUserLogonfromnewASN.yaml
query: |
let admins=(IdentityInfo
| where AssignedRoles contains "admin" or GroupMembership has "Admin"
| summarize by tolower(AccountUPN));
let known_asns = (
SigninLogs
| where TimeGenerated between(ago(14d)..ago(1d))
| where ResultType == 0
| summarize by AutonomousSystemNumber);
SigninLogs
| where TimeGenerated > ago(1d)
| where ResultType == 0
| where tolower(UserPrincipalName) in (admins)
| where AutonomousSystemNumber !in (known_asns)
| project-reorder TimeGenerated, UserPrincipalName, UserAgent, IPAddress, AutonomousSystemNumber
| extend AccountName = tostring(split(UserPrincipalName, "@")[0]), AccountUPNSuffix = tostring(split(UserPrincipalName, "@")[1])
metadata:
support:
tier: Community
source:
kind: Community
categories:
domains:
- Identity
- Security - Others
author:
name: Microsoft Security Research
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: UserPrincipalName
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
entityType: Account
- fieldMappings:
- identifier: Address
columnName: IPAddress
entityType: IP
tactics:
- DefenseEvasion
severity: Medium
name: Privileged User Logon from new ASN
queryFrequency: 1d
triggerOperator: gt
kind: Scheduled
description: |
'Detects a successful logon by a privileged account from an ASN not logged in from in the last 14 days.
Monitor these logons to ensure they are legitimate and identify if there are any similar sign ins.'
{
"$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/55073036-bb86-47d3-a85a-b113ac3d9396')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/55073036-bb86-47d3-a85a-b113ac3d9396')]",
"properties": {
"alertRuleTemplateName": "55073036-bb86-47d3-a85a-b113ac3d9396",
"customDetails": null,
"description": "'Detects a successful logon by a privileged account from an ASN not logged in from in the last 14 days.\n Monitor these logons to ensure they are legitimate and identify if there are any similar sign ins.'\n",
"displayName": "Privileged User Logon from new ASN",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "UserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/PrivilegedUserLogonfromnewASN.yaml",
"query": "let admins=(IdentityInfo\n | where AssignedRoles contains \"admin\" or GroupMembership has \"Admin\"\n | summarize by tolower(AccountUPN));\n let known_asns = (\n SigninLogs\n | where TimeGenerated between(ago(14d)..ago(1d))\n | where ResultType == 0\n | summarize by AutonomousSystemNumber);\n SigninLogs\n | where TimeGenerated > ago(1d)\n | where ResultType == 0\n | where tolower(UserPrincipalName) in (admins)\n | where AutonomousSystemNumber !in (known_asns)\n | project-reorder TimeGenerated, UserPrincipalName, UserAgent, IPAddress, AutonomousSystemNumber\n | extend AccountName = tostring(split(UserPrincipalName, \"@\")[0]), AccountUPNSuffix = tostring(split(UserPrincipalName, \"@\")[1])\n",
"queryFrequency": "P1D",
"queryPeriod": "P7D",
"severity": "Medium",
"subTechniques": [
"T1078.004"
],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"tags": [
"AADSecOpsGuide"
],
"techniques": [
"T1078"
],
"templateVersion": "1.0.6",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}