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