Anomolous Single Factor Signin
Id | f7c3f5c8-71ea-49ff-b8b3-148f0e346291 |
Rulename | Anomolous Single Factor Signin |
Description | Detects successful signins using single factor authentication where the device, location, and ASN are abnormal. Single factor authentications pose an opportunity to access compromised accounts, investigate these for anomalous occurrencess. Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-devices#non-compliant-device-sign-in |
Severity | Low |
Tactics | InitialAccess |
Techniques | T1078.004 |
Required data connectors | AzureActiveDirectory |
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/AnomolousSingleFactorSignin.yaml |
Version | 1.0.3 |
Arm template | f7c3f5c8-71ea-49ff-b8b3-148f0e346291.json |
let known_locations = (SigninLogs
| where TimeGenerated between(ago(7d)..ago(1d))
| where ResultType == 0
| extend LocationDetail = strcat(Location, "-", LocationDetails.state)
| summarize by LocationDetail);
let known_asn = (SigninLogs
| where TimeGenerated between(ago(7d)..ago(1d))
| where ResultType == 0
| summarize by AutonomousSystemNumber);
SigninLogs
| where TimeGenerated > ago(1d)
| where ResultType == 0
| where isempty(DeviceDetail.deviceId)
| where AuthenticationRequirement == "singleFactorAuthentication"
| extend LocationDetail = strcat(Location, "-", LocationDetails.state)
| where AutonomousSystemNumber !in (known_asn) and LocationDetail !in (known_locations)
tactics:
- InitialAccess
requiredDataConnectors:
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
query: |
let known_locations = (SigninLogs
| where TimeGenerated between(ago(7d)..ago(1d))
| where ResultType == 0
| extend LocationDetail = strcat(Location, "-", LocationDetails.state)
| summarize by LocationDetail);
let known_asn = (SigninLogs
| where TimeGenerated between(ago(7d)..ago(1d))
| where ResultType == 0
| summarize by AutonomousSystemNumber);
SigninLogs
| where TimeGenerated > ago(1d)
| where ResultType == 0
| where isempty(DeviceDetail.deviceId)
| where AuthenticationRequirement == "singleFactorAuthentication"
| extend LocationDetail = strcat(Location, "-", LocationDetails.state)
| where AutonomousSystemNumber !in (known_asn) and LocationDetail !in (known_locations)
queryFrequency: 1d
entityMappings:
- entityType: Account
fieldMappings:
- columnName: UserPrincipalName
identifier: FullName
- entityType: IP
fieldMappings:
- columnName: IPAddress
identifier: Address
relevantTechniques:
- T1078.004
tags:
- AADSecOpsGuide
description: |
'Detects successful signins using single factor authentication where the device, location, and ASN are abnormal.
Single factor authentications pose an opportunity to access compromised accounts, investigate these for anomalous occurrencess.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-devices#non-compliant-device-sign-in'
queryPeriod: 7d
triggerOperator: gt
metadata:
categories:
domains:
- Security - Others
source:
kind: Community
author:
name: Pete Bryan
support:
tier: Community
id: f7c3f5c8-71ea-49ff-b8b3-148f0e346291
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/AnomolousSingleFactorSignin.yaml
triggerThreshold: 0
severity: Low
name: Anomolous Single Factor Signin
version: 1.0.3
kind: Scheduled
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/f7c3f5c8-71ea-49ff-b8b3-148f0e346291')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f7c3f5c8-71ea-49ff-b8b3-148f0e346291')]",
"properties": {
"alertRuleTemplateName": "f7c3f5c8-71ea-49ff-b8b3-148f0e346291",
"customDetails": null,
"description": "'Detects successful signins using single factor authentication where the device, location, and ASN are abnormal.\n Single factor authentications pose an opportunity to access compromised accounts, investigate these for anomalous occurrencess.\n Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-devices#non-compliant-device-sign-in'\n",
"displayName": "Anomolous Single Factor Signin",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "UserPrincipalName",
"identifier": "FullName"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/SigninLogs/AnomolousSingleFactorSignin.yaml",
"query": "let known_locations = (SigninLogs\n | where TimeGenerated between(ago(7d)..ago(1d))\n | where ResultType == 0\n | extend LocationDetail = strcat(Location, \"-\", LocationDetails.state)\n | summarize by LocationDetail);\n let known_asn = (SigninLogs\n | where TimeGenerated between(ago(7d)..ago(1d))\n | where ResultType == 0\n | summarize by AutonomousSystemNumber);\n SigninLogs\n | where TimeGenerated > ago(1d)\n | where ResultType == 0\n | where isempty(DeviceDetail.deviceId)\n | where AuthenticationRequirement == \"singleFactorAuthentication\"\n | extend LocationDetail = strcat(Location, \"-\", LocationDetails.state)\n | where AutonomousSystemNumber !in (known_asn) and LocationDetail !in (known_locations)\n",
"queryFrequency": "P1D",
"queryPeriod": "P7D",
"severity": "Low",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"tags": [
"AADSecOpsGuide"
],
"techniques": [
"T1078"
],
"templateVersion": "1.0.3",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}