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okta_threatinsight_suspected_brute_force_attack.yaral
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okta_threatinsight_suspected_brute_force_attack.yaral
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/*
* Copyright 2023 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
rule okta_threatinsight_suspected_brute_force_attack {
meta:
author = "Google Cloud Security"
description = "Okta ThreatInsight detects multiple login failures from the same IP across one or more Okta orgs."
reference = "https://help.okta.com/en-us/Content/Topics/Security/threat-insight/configure-threatinsight-system-log.htm"
mitre_attack_tactic = "Credential Access"
mitre_attack_technique = "Brute Force: Password Guessing"
mitre_attack_url = "https://attack.mitre.org/techniques/T1110/001/"
mitre_attack_version = "v13.1"
type = "Alert"
data_source = "Okta"
severity = "Medium"
priority = "Medium"
events:
$bruteforce.metadata.product_name = "Okta"
$bruteforce.metadata.vendor_name = "Okta"
$bruteforce.metadata.event_type = "USER_UNCATEGORIZED"
$bruteforce.metadata.product_event_type = "security.threat.detected"
$bruteforce.security_result.category_details = "Login Failures"
$bruteforce.principal.user.userid = $userid
match:
$userid over 1h
outcome:
$risk_score = max(
35 +
// If the IP Address is marked as suspicious IP address by Okta ThreatInsight
if($bruteforce.security_result.detection_fields["threatSuspected"] = "true", 30) +
// Unauthorized target geographies
if($bruteforce.principal.ip_geo_artifact.location.country_or_region = "Cuba", 20) +
if($bruteforce.principal.ip_geo_artifact.location.country_or_region = "Iran", 20) +
if($bruteforce.principal.ip_geo_artifact.location.country_or_region = "North Korea", 20) +
if($bruteforce.principal.ip_geo_artifact.location.country_or_region = "Russia", 20) +
if($bruteforce.principal.ip_geo_artifact.location.country_or_region = "Syria", 20)
)
$mitre_attack_tactic = "Credential Access"
$mitre_attack_technique = "Brute Force: Password Guessing"
$target_user_agent = array_distinct($bruteforce.network.http.user_agent)
$principal_ip = array_distinct($bruteforce.principal.ip)
$principal_ip_country = array_distinct($bruteforce.principal.ip_geo_artifact.location.country_or_region)
$principal_ip_state = array_distinct($bruteforce.principal.ip_geo_artifact.location.state)
$principal_ip_city = array_distinct($bruteforce.principal.location.city)
$security_result_summary = array_distinct($bruteforce.security_result.summary)
condition:
$bruteforce
}