Password spray attack against Microsoft Entra ID Seamless SSO
Id | fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba |
Rulename | Password spray attack against Microsoft Entra ID Seamless SSO |
Description | This query detects when there is a spike in Microsoft Entra ID Seamless SSO errors. They may not be caused by a Password Spray attack, but the cause of the errors might need to be investigated. Microsoft Entra ID only logs the requests that matched existing accounts, thus there might have been unlogged requests for non-existing accounts. |
Severity | Medium |
Tactics | CredentialAccess |
Techniques | T1110 |
Required data connectors | AzureActiveDirectory |
Kind | Scheduled |
Query frequency | 1h |
Query period | 1h |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SeamlessSSOPasswordSpray.yaml |
Version | 1.0.4 |
Arm template | fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba.json |
let account_threshold = 5;
AADNonInteractiveUserSignInLogs
//| where ResultType == "81016"
| where ResultType startswith "81"
| summarize DistinctAccounts = dcount(UserPrincipalName), DistinctAddresses = make_set(IPAddress,100) by ResultType
| where DistinctAccounts > account_threshold
| mv-expand IPAddress = DistinctAddresses
| extend IPAddress = tostring(IPAddress)
| join kind=leftouter (union isfuzzy=true SigninLogs, AADNonInteractiveUserSignInLogs) on IPAddress
| summarize
StartTime = min(TimeGenerated),
EndTime = max(TimeGenerated),
UserPrincipalName = make_set(UserPrincipalName,100),
UserAgent = make_set(UserAgent,100),
ResultDescription = take_any(ResultDescription),
ResultSignature = take_any(ResultSignature)
by IPAddress, Type, ResultType
| project Type, StartTime, EndTime, IPAddress, ResultType, ResultDescription, ResultSignature, UserPrincipalName, UserAgent = iff(array_length(UserAgent) == 1, UserAgent[0], UserAgent)
| extend Name = tostring(split(UserPrincipalName[0],'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName[0],'@',1)[0])
requiredDataConnectors:
- connectorId: AzureActiveDirectory
dataTypes:
- AADNonInteractiveUserSignInLogs
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SeamlessSSOPasswordSpray.yaml
version: 1.0.4
status: Available
queryPeriod: 1h
severity: Medium
relevantTechniques:
- T1110
tactics:
- CredentialAccess
kind: Scheduled
queryFrequency: 1h
description: |
'This query detects when there is a spike in Microsoft Entra ID Seamless SSO errors. They may not be caused by a Password Spray attack, but the cause of the errors might need to be investigated.
Microsoft Entra ID only logs the requests that matched existing accounts, thus there might have been unlogged requests for non-existing accounts.'
query: |
let account_threshold = 5;
AADNonInteractiveUserSignInLogs
//| where ResultType == "81016"
| where ResultType startswith "81"
| summarize DistinctAccounts = dcount(UserPrincipalName), DistinctAddresses = make_set(IPAddress,100) by ResultType
| where DistinctAccounts > account_threshold
| mv-expand IPAddress = DistinctAddresses
| extend IPAddress = tostring(IPAddress)
| join kind=leftouter (union isfuzzy=true SigninLogs, AADNonInteractiveUserSignInLogs) on IPAddress
| summarize
StartTime = min(TimeGenerated),
EndTime = max(TimeGenerated),
UserPrincipalName = make_set(UserPrincipalName,100),
UserAgent = make_set(UserAgent,100),
ResultDescription = take_any(ResultDescription),
ResultSignature = take_any(ResultSignature)
by IPAddress, Type, ResultType
| project Type, StartTime, EndTime, IPAddress, ResultType, ResultDescription, ResultSignature, UserPrincipalName, UserAgent = iff(array_length(UserAgent) == 1, UserAgent[0], UserAgent)
| extend Name = tostring(split(UserPrincipalName[0],'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName[0],'@',1)[0])
id: fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba
triggerThreshold: 0
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: UserPrincipalName
- identifier: Name
columnName: Name
- identifier: UPNSuffix
columnName: UPNSuffix
entityType: Account
- fieldMappings:
- identifier: Address
columnName: IPAddress
entityType: IP
name: Password spray attack against Microsoft Entra ID Seamless SSO
{
"$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/fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba')]",
"properties": {
"alertRuleTemplateName": "fb7ca1c9-e14c-40a3-856e-28f3c14ea1ba",
"customDetails": null,
"description": "'This query detects when there is a spike in Microsoft Entra ID Seamless SSO errors. They may not be caused by a Password Spray attack, but the cause of the errors might need to be investigated.\nMicrosoft Entra ID only logs the requests that matched existing accounts, thus there might have been unlogged requests for non-existing accounts.'\n",
"displayName": "Password spray attack against Microsoft Entra ID Seamless SSO",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "UserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "Name",
"identifier": "Name"
},
{
"columnName": "UPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPAddress",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Entra ID/Analytic Rules/SeamlessSSOPasswordSpray.yaml",
"query": "let account_threshold = 5;\nAADNonInteractiveUserSignInLogs\n//| where ResultType == \"81016\"\n| where ResultType startswith \"81\"\n| summarize DistinctAccounts = dcount(UserPrincipalName), DistinctAddresses = make_set(IPAddress,100) by ResultType\n| where DistinctAccounts > account_threshold\n| mv-expand IPAddress = DistinctAddresses\n| extend IPAddress = tostring(IPAddress)\n| join kind=leftouter (union isfuzzy=true SigninLogs, AADNonInteractiveUserSignInLogs) on IPAddress\n| summarize\n StartTime = min(TimeGenerated),\n EndTime = max(TimeGenerated),\n UserPrincipalName = make_set(UserPrincipalName,100),\n UserAgent = make_set(UserAgent,100),\n ResultDescription = take_any(ResultDescription),\n ResultSignature = take_any(ResultSignature)\n by IPAddress, Type, ResultType\n| project Type, StartTime, EndTime, IPAddress, ResultType, ResultDescription, ResultSignature, UserPrincipalName, UserAgent = iff(array_length(UserAgent) == 1, UserAgent[0], UserAgent)\n| extend Name = tostring(split(UserPrincipalName[0],'@',0)[0]), UPNSuffix = tostring(split(UserPrincipalName[0],'@',1)[0])\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1110"
],
"templateVersion": "1.0.4",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}