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aws_cloudtrail_logging_tampered.yaral
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aws_cloudtrail_logging_tampered.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 aws_cloudtrail_logging_tampered {
meta:
author = "Google Cloud Security"
description = "Detects when CloudTrail logging is updated, stopped or deleted."
mitre_attack_tactic = "Defense Evasion"
mitre_attack_technique = "Impair Defenses: Disable Cloud Logs"
mitre_attack_url = "https://attack.mitre.org/techniques/T1562/008/"
mitre_attack_version = "v13.1"
type = "Alert"
data_source = "AWS CloudTrail"
platform = "AWS"
severity = "High"
priority = "High"
events:
$cloudtrail.metadata.vendor_name = "AMAZON"
$cloudtrail.metadata.product_name = "AWS CloudTrail"
(
$cloudtrail.metadata.product_event_type = "UpdateTrail" or
$cloudtrail.metadata.product_event_type = "StopLogging" or
$cloudtrail.metadata.product_event_type = "DeleteTrail" or
$cloudtrail.metadata.product_event_type = "PutEventSelectors"
)
$cloudtrail.security_result.action = "ALLOW"
$cloudtrail.principal.user.user_display_name = $user_id
match:
$user_id over 1h
outcome:
$risk_score = max(75)
$mitre_attack_tactic = "Defense Evasion"
$mitre_attack_technique = "Impair Defenses: Disable Cloud Logs"
$mitre_attack_technique_id = "T1562.008"
$event_count = count_distinct($cloudtrail.metadata.id)
$network_http_user_agent = array_distinct($cloudtrail.network.http.user_agent)
$principal_ip = array_distinct($cloudtrail.principal.ip)
$principal_ip_country = array_distinct($cloudtrail.principal.ip_geo_artifact.location.country_or_region)
$principal_ip_state = array_distinct($cloudtrail.principal.ip_geo_artifact.location.state)
$principal_user_display_name = array_distinct($cloudtrail.principal.user.user_display_name)
$recipient_aws_account_id = array_distinct($cloudtrail.target.resource.attribute.labels["Recipient Account Id"])
$aws_region = array_distinct($cloudtrail.principal.location.name)
$target_resource_name = array_distinct($cloudtrail.target.resource.name)
$target_resource_product_object_id = array_distinct($cloudtrail.target.resource.product_object_id)
condition:
$cloudtrail
}