ID | Technique | Tactic |
---|---|---|
T1562.008 | Disable or Modify Cloud Logs | Defense Evasion |
Detection: ASL AWS Defense Evasion Delete CloudWatch Log Group
Description
The following analytic detects the deletion of CloudWatch log groups in AWS, identified through DeleteLogGroup
events in CloudTrail logs. This method leverages Amazon Security Lake logs parsed in the OCSF format. The activity is significant because attackers may delete log groups to evade detection and disrupt logging capabilities, hindering incident response efforts. If confirmed malicious, this action could allow attackers to cover their tracks, making it difficult to trace their activities and potentially leading to undetected data breaches or further malicious actions within the compromised AWS environment.
Search
1`amazon_security_lake` api.operation=DeleteLogGroup
2| fillnull
3| stats count min(_time) as firstTime max(_time) as lastTime by actor.user.uid api.operation api.service.name http_request.user_agent src_endpoint.ip actor.user.account.uid cloud.provider cloud.region
4| rename actor.user.uid as user api.operation as action api.service.name as dest http_request.user_agent as user_agent src_endpoint.ip as src actor.user.account.uid as vendor_account cloud.provider as vendor_product cloud.region as vendor_region
5| `security_content_ctime(firstTime)`
6| `security_content_ctime(lastTime)`
7| `asl_aws_defense_evasion_delete_cloudwatch_log_group_filter`
Data Source
Name | Platform | Sourcetype | Source |
---|---|---|---|
ASL AWS CloudTrail | 'aws:asl' |
'aws_asl' |
Macros Used
Name | Value |
---|---|
amazon_security_lake | sourcetype=aws:asl |
asl_aws_defense_evasion_delete_cloudwatch_log_group_filter | search * |
asl_aws_defense_evasion_delete_cloudwatch_log_group_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
The detection is based on Amazon Security Lake events from Amazon Web Services (AWS), which is a centralized data lake that provides security-related data from AWS services. To use this detection, you must ingest CloudTrail logs from Amazon Security Lake into Splunk. To run this search, ensure that you ingest events using the latest version of Splunk Add-on for Amazon Web Services (https://splunkbase.splunk.com/app/1876) or the Federated Analytics App.
Known False Positives
While this search has no known false positives, it is possible that an AWS admin has deleted CloudWatch logging. Please investigate this activity.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message:
User $user$ has deleted a CloudWatch logging group
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_asl |
aws:asl |
Integration | ✅ Passing | Dataset | aws_asl |
aws:asl |
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: 7