THIS IS A EXPERIMENTAL DETECTION
This detection has been marked experimental by the Splunk Threat Research team. This means we have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is NOT supported.
This analytic identifies AWS
DeleteTrail events within CloudTrail logs. Adversaries often try to impair their target's defenses by stopping their malicious activity from being logged, so that they may operate with stealth and avoid detection. When the adversary has the right type of permissions in the compromised AWS environment, they may delete the the entire cloudtrail that is logging activities in the environment.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2023-05-31
- Author: Patrick Bareiss, Splunk
- ID: 1f0b47e5-0134-43eb-851c-e3258638945e
Kill Chain Phase
- CIS 10
1 2 3 4 5 `amazon_security_lake` api.operation=DeleteTrail | stats count min(_time) as firstTime max(_time) as lastTime by identity.user.account_uid identity.user.credential_uid identity.user.name identity.user.type identity.user.uid identity.user.uuid http_request.user_agent src_endpoint.ip cloud.region | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `asl_aws_defense_evasion_delete_cloudtrail_filter`
The SPL above uses the following Macros:
asl_aws_defense_evasion_delete_cloudtrail_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
You must install Splunk Add-On for AWS Version v7.0.0 (https://splunkbase.splunk.com/app/1876) that includes includes a merge of all the capabilities of the Splunk Add-on for Amazon Security Lake. This search works with Amazon Security Lake logs which are parsed in the Open Cybersecurity Schema Framework (OCSF)format.
Known False Positives
While this search has no known false positives, it is possible that an AWS admin has stopped cloudTrail logging. Please investigate this activity.
Associated Analytic Story
|90.0||100||90||User $identity.user.name$ has delete a CloudTrail logging for account id $identity.user.account_uid$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 1