ID | Technique | Tactic |
---|---|---|
T1562.008 | Disable or Modify Cloud Logs | Defense Evasion |
Detection: AWS Defense Evasion Stop Logging Cloudtrail
Description
The following analytic detects StopLogging
events in AWS CloudTrail logs. It leverages CloudTrail event data to identify when logging is intentionally stopped, excluding console-based actions and focusing on successful attempts. This activity is significant because adversaries may stop logging to evade detection and operate stealthily within the compromised environment. If confirmed malicious, this action could allow attackers to perform further activities without being logged, hindering incident response and forensic investigations, and potentially leading to unauthorized access or data exfiltration.
Search
1`cloudtrail` eventName = StopLogging eventSource = cloudtrail.amazonaws.com userAgent!=console.amazonaws.com errorCode = success
2| rename user_name as user
3| stats count min(_time) as firstTime max(_time) as lastTime by signature dest user user_agent src vendor_account vendor_region vendor_product
4| `security_content_ctime(firstTime)`
5| `security_content_ctime(lastTime)`
6| `aws_defense_evasion_stop_logging_cloudtrail_filter`
Data Source
Name | Platform | Sourcetype | Source |
---|---|---|---|
AWS CloudTrail StopLogging | 'aws:cloudtrail' |
'aws_cloudtrail' |
Macros Used
Name | Value |
---|---|
cloudtrail | sourcetype=aws:cloudtrail |
aws_defense_evasion_stop_logging_cloudtrail_filter | search * |
aws_defense_evasion_stop_logging_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:
User $user$ has stopped Cloudtrail logging for account id $vendor_account$ from IP $src$
Risk Object | Risk Object Type | Risk Score | Threat Objects |
---|---|---|---|
user | user | 90 | src |
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: 6