Potential Password Spray Attack
| Id | e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508 |
| Rulename | Potential Password Spray Attack |
| Description | This query searches for failed attempts to log into the Okta console from more than 15 various users within a 5 minute timeframe from the same source. This is a potential indication of a password spray attack |
| Severity | Medium |
| Tactics | CredentialAccess |
| Techniques | T1110 |
| Required data connectors | OktaSSO |
| 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/Okta Single Sign-On/Analytic Rules/PasswordSpray.yaml |
| Version | 1.0.2 |
| Arm template | e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508.json |
let FailureThreshold = 15;
let FailedEvents = Okta_CL
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize dcount(actor_alternateId_s) by client_ipAddress_s, bin(TimeGenerated, 5m)
| where dcount_actor_alternateId_s > FailureThreshold
| project client_ipAddress_s, TimeGenerated;
Okta_CL
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize Users = make_set(actor_alternateId_s) by client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), bin(TimeGenerated, 5m)
| join kind=inner (FailedEvents) on client_ipAddress_s, TimeGenerated
| sort by TimeGenerated desc
| extend timestamp = TimeGenerated, IPCustomEntity = client_ipAddress_s
severity: Medium
queryFrequency: 1h
relevantTechniques:
- T1110
tactics:
- CredentialAccess
kind: Scheduled
query: |
let FailureThreshold = 15;
let FailedEvents = Okta_CL
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize dcount(actor_alternateId_s) by client_ipAddress_s, bin(TimeGenerated, 5m)
| where dcount_actor_alternateId_s > FailureThreshold
| project client_ipAddress_s, TimeGenerated;
Okta_CL
| where eventType_s =~ "user.session.start"and outcome_reason_s in ("VERIFICATION_ERROR","INVALID_CREDENTIALS")
| summarize Users = make_set(actor_alternateId_s) by client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', ""), Country = column_ifexists('client_geographicalContext_country_s', ""), bin(TimeGenerated, 5m)
| join kind=inner (FailedEvents) on client_ipAddress_s, TimeGenerated
| sort by TimeGenerated desc
| extend timestamp = TimeGenerated, IPCustomEntity = client_ipAddress_s
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/PasswordSpray.yaml
queryPeriod: 1h
status: Available
version: 1.0.2
name: Potential Password Spray Attack
requiredDataConnectors:
- dataTypes:
- Okta_CL
connectorId: OktaSSO
triggerOperator: gt
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
id: e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508
description: |
'This query searches for failed attempts to log into the Okta console from more than 15 various users within a 5 minute timeframe from the same source. This is a potential indication of a password spray attack'
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Potential Password Spray Attack",
"description": "'This query searches for failed attempts to log into the Okta console from more than 15 various users within a 5 minute timeframe from the same source. This is a potential indication of a password spray attack'\n",
"severity": "Medium",
"enabled": true,
"query": "let FailureThreshold = 15;\nlet FailedEvents = Okta_CL\n| where eventType_s =~ \"user.session.start\"and outcome_reason_s in (\"VERIFICATION_ERROR\",\"INVALID_CREDENTIALS\")\n| summarize dcount(actor_alternateId_s) by client_ipAddress_s, bin(TimeGenerated, 5m)\n| where dcount_actor_alternateId_s > FailureThreshold\n| project client_ipAddress_s, TimeGenerated;\nOkta_CL\n| where eventType_s =~ \"user.session.start\"and outcome_reason_s in (\"VERIFICATION_ERROR\",\"INVALID_CREDENTIALS\")\n| summarize Users = make_set(actor_alternateId_s) by client_ipAddress_s, City = column_ifexists('client_geographicalContext_city_s', \"\"), Country = column_ifexists('client_geographicalContext_country_s', \"\"), bin(TimeGenerated, 5m)\n| join kind=inner (FailedEvents) on client_ipAddress_s, TimeGenerated\n| sort by TimeGenerated desc\n| extend timestamp = TimeGenerated, IPCustomEntity = client_ipAddress_s\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CredentialAccess"
],
"techniques": [
"T1110"
],
"alertRuleTemplateName": "e27dd7e5-4367-4c40-a2b7-fcd7e7a8a508",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "IPCustomEntity",
"identifier": "Address"
}
],
"entityType": "IP"
}
],
"templateVersion": "1.0.2",
"status": "Available",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Okta Single Sign-On/Analytic Rules/PasswordSpray.yaml"
}
}
]
}