ID | Technique | Tactic |
---|---|---|
T1562.008 | Disable or Modify Cloud Logs | Defense Evasion |
T1562 | Impair Defenses | Defense Evasion |
Detection: AWS Defense Evasion Delete Cloudtrail
Description
The following analytic detects the deletion of AWS CloudTrail logs by identifying DeleteTrail
events within CloudTrail logs. This detection leverages CloudTrail data to monitor for successful DeleteTrail
actions, excluding those initiated from the AWS console. This activity is significant because adversaries may delete CloudTrail logs to evade detection and operate stealthily within the compromised environment. If confirmed malicious, this action could allow attackers to cover their tracks, making it difficult to trace their activities and potentially leading to prolonged unauthorized access and further exploitation.
Search
1`cloudtrail` eventName = DeleteTrail eventSource = cloudtrail.amazonaws.com userAgent !=console.amazonaws.com errorCode = success
2| stats count min(_time) as firstTime max(_time) as lastTime values(requestParameters.name) as deleted_cloudtrail_name by src region eventName userAgent user_arn aws_account_id
3| `security_content_ctime(firstTime)`
4| `security_content_ctime(lastTime)`
5| `aws_defense_evasion_delete_cloudtrail_filter`
Data Source
Name | Platform | Sourcetype | Source | Supported App |
---|---|---|---|---|
AWS CloudTrail DeleteTrail | AWS | 'aws:cloudtrail' |
'aws_cloudtrail' |
N/A |
Macros Used
Name | Value |
---|---|
cloudtrail | sourcetype=aws:cloudtrail |
aws_defense_evasion_delete_cloudtrail_filter | search * |
aws_defense_evasion_delete_cloudtrail_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
Default Configuration
This detection is configured by default in Splunk Enterprise Security to run with the following settings:
Setting | Value |
---|---|
Disabled | true |
Cron Schedule | 0 * * * * |
Earliest Time | -70m@m |
Latest Time | -10m@m |
Schedule Window | auto |
Creates Notable | Yes |
Rule Title | %name% |
Rule Description | %description% |
Notable Event Fields | user, dest |
Creates Risk Event | True |
Implementation
You must install Splunk AWS Add on and enable CloudTrail logs in your AWS Environment.
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
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
User $user_arn$ has delete a CloudTrail logging for account id $aws_account_id$ from IP $src$ | 90 | 100 | 90 |
References
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | ✅ Passing | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | aws_cloudtrail |
aws:cloudtrail |
Integration | ✅ Passing | Dataset | aws_cloudtrail |
aws:cloudtrail |
Replay any dataset to Splunk Enterprise by using our replay.py
tool or the UI.
Alternatively you can replay a dataset into a Splunk Attack Range
Source: GitHub | Version: 2