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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.

  • Type: TTP

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

  • Last Updated: 2024-05-14
  • Author: Bhavin Patel, Splunk
  • ID: 82092925-9ca1-4e06-98b8-85a2d3889552

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1562.008 Disable or Modify Cloud Logs Defense Evasion
T1562 Impair Defenses Defense Evasion
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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`cloudtrail` eventName = DeleteTrail eventSource = cloudtrail.amazonaws.com userAgent !=console.amazonaws.com errorCode = success
| 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 
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `aws_defense_evasion_delete_cloudtrail_filter`

Macros

The SPL above uses the following Macros:

:information_source: aws_defense_evasion_delete_cloudtrail_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 stopped cloudTrail logging. Please investigate this activity.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
90.0 100 90 User $user_arn$ has delete a CloudTrail logging 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

source | version: 2