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Description

The following analytic detects the deletion of CloudWatch log groups in AWS, identified through DeleteLogGroup events in CloudTrail logs. This detection leverages CloudTrail data to monitor for successful log group deletions, excluding console-based actions. This activity is significant as it indicates potential attempts to evade logging and monitoring, which is crucial for maintaining visibility into AWS activities. If confirmed malicious, this could allow attackers to hide their tracks, making it difficult to detect further malicious actions or investigate incidents within the compromised AWS environment.

  • Type: TTP

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

  • Last Updated: 2024-05-26
  • Author: Gowthamaraj Rajendran, Splunk
  • ID: d308b0f1-edb7-4a62-a614-af321160710f

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 


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`cloudtrail` eventName = DeleteLogGroup eventSource = logs.amazonaws.com userAgent !=console.amazonaws.com errorCode = success
| stats count min(_time) as firstTime max(_time) as lastTime values(requestParameters.logGroupName) as log_group_name by src region eventName userAgent user_arn aws_account_id 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `aws_defense_evasion_delete_cloudwatch_log_group_filter`

Macros

The SPL above uses the following Macros:

:information_source: 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.

  • _time
  • eventName
  • eventSource
  • requestParameters.name
  • userAgent
  • aws_account_id
  • src
  • region

How To Implement

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 deleted CloudWatch logging. Please investigate this activity.

Associated Analytic Story

RBA

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

: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

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