aws_iam_failure_group_deletion.yml

name: AWS IAM Failure Group Deletion
id: 723b861a-92eb-11eb-93b8-acde48001122
version: 3
date: '2024-05-11'
author: Michael Haag, Splunk
status: production
type: Anomaly
description: The following analytic identifies failed attempts to delete AWS IAM groups.
  It leverages AWS CloudTrail logs to detect events where the DeleteGroup action fails
  due to errors like NoSuchEntityException, DeleteConflictException, or AccessDenied.
  This activity is significant as it may indicate unauthorized attempts to modify
  IAM group configurations, which could be a precursor to privilege escalation or
  other malicious actions. If confirmed malicious, this could allow an attacker to
  disrupt IAM policies, potentially leading to unauthorized access or denial of service
  within the AWS environment.
data_source:
- AWS CloudTrail DeleteGroup
search: '`cloudtrail` eventSource=iam.amazonaws.com eventName=DeleteGroup errorCode
  IN (NoSuchEntityException,DeleteConflictException, AccessDenied) (userAgent!=*.amazonaws.com)
  | stats count min(_time) as firstTime max(_time) as lastTime values(requestParameters.groupName)
  as group_name by src eventName eventSource aws_account_id errorCode errorMessage
  userAgent eventID awsRegion userIdentity.principalId user_arn | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `aws_iam_failure_group_deletion_filter`'
how_to_implement: The Splunk AWS Add-on and Splunk App for AWS is required to utilize
  this data. The search requires AWS CloudTrail logs.
known_false_positives: This detection will require tuning to provide high fidelity
  detection capabilties. Tune based on src addresses (corporate offices, VPN terminations)
  or by groups of users. Not every user with AWS access should have permission to
  delete groups (least privilege).
references:
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/iam/delete-group.html
- https://docs.aws.amazon.com/IAM/latest/APIReference/API_DeleteGroup.html
tags:
  analytic_story:
  - AWS IAM Privilege Escalation
  asset_type: AWS Account
  confidence: 50
  impact: 10
  message: User $user_arn$ has had mulitple failures while attempting to delete groups
    from $src$
  mitre_attack_id:
  - T1098
  observable:
  - name: src
    type: IP Address
    role:
    - Attacker
  - name: user_arn
    type: User
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - eventName
  - userAgent
  - errorCode
  - requestParameters.groupName
  risk_score: 5
  security_domain: cloud
tests:
- name: True Positive Test
  attack_data:
  - data: 
      https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1098/aws_iam_failure_group_deletion/aws_iam_failure_group_deletion.json
    sourcetype: aws:cloudtrail
    source: aws_cloudtrail
    update_timestamp: true