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])
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.'
queryPeriod: 7d
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])
tactics:
- DefenseEvasion
triggerThreshold: 0
metadata:
author:
name: Microsoft Security Research
categories:
domains:
- Identity
- Security - Others
support:
tier: Community
source:
kind: Community
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/PrivilegedUserLogonfromnewASN.yaml
requiredDataConnectors:
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
- dataTypes:
- BehaviorAnalytics
connectorId: BehaviorAnalytics
- dataTypes:
- IdentityInfo
connectorId: BehaviorAnalytics
name: Privileged User Logon from new ASN
kind: Scheduled
relevantTechniques:
- T1078.004
id: 55073036-bb86-47d3-a85a-b113ac3d9396
triggerOperator: gt
queryFrequency: 1d
version: 1.0.6
tags:
- AADSecOpsGuide
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: UserPrincipalName
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPAddress
{
"$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"
}
]
}