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Description

The following analytic detects the deletion of CloudWatch Log Groups within AWS CloudTrail logs. This action is indicative of an attacker's attempt to evade detection by disrupting the logging and monitoring capabilities of CloudWatch. By identifying and analyzing DeleteLogGroup events, this analytic helps in uncovering efforts to obscure malicious activities within a compromised AWS environment. Such evasion tactics are critical for a Security Operations Center (SOC) to identify as they signal an attacker's intent to operate undetected, posing a significant threat to the integrity and security of cloud environments. The impact of this attack is substantial, as it can lead to a loss of visibility into potentially malicious activities, hindering incident response and forensics efforts.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-02-12
  • Author: Patrick Bareiss, Splunk
  • ID: 0f701b38-a0fb-43fd-a83d-d12265f71f33

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1562 Impair Defenses Defense Evasion
T1562.008 Disable or Modify Cloud Logs Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE
1
2
3
4
5
6
7
`amazon_security_lake` api.operation=DeleteLogGroup 
| fillnull 
| stats count min(_time) as firstTime max(_time) as lastTime by api.operation actor.user.account_uid actor.user.uid http_request.user_agent src_endpoint.ip cloud.region 
| rename actor.user.uid as user, src_endpoint.ip as src_ip, cloud.region as region, http_request.user_agent as user_agent, actor.user.account_uid as aws_account_id   
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `asl_aws_defense_evasion_delete_cloudwatch_log_group_filter`

Macros

The SPL above uses the following Macros:

:information_source: asl_aws_defense_evasion_delete_cloudwatch_log_group_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • api.operation
  • actor.user.account_uid
  • actor.user.name
  • actor.user.uid
  • http_request.user_agent
  • src_endpoint.ip
  • cloud.region

How To Implement

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

RBA

Risk Score Impact Confidence Message
90.0 100 90 User $user$ has deleted a CloudWatch logging group for account id $aws_account_id$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

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 | version: 2