aws_exfiltration_via_batch_service.yml

name: AWS Exfiltration via Batch Service
id: 04455dd3-ced7-480f-b8e6-5469b99e98e2
version: 1
date: '2023-04-24'
author: Bhavin Patel, Splunk
status: production
type: TTP
data_source: 
- AWS CloudTrail JobCreated
description: This search looks for events where AWS Batch Service is used for creating a job that could potentially abuse the AWS Bucket Replication feature on S3 buckets. This AWS service can used to transfer data between different AWS S3 buckets and an attacker can leverage this to exfiltrate data by creating a malicious batch job. 
search: '`cloudtrail` eventName = JobCreated |  stats count min(_time) as firstTime max(_time) as lastTime values(serviceEventDetails.jobArn) as job_arn values(serviceEventDetails.status) as status by src_ip  aws_account_id eventName errorCode userAgent| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `aws_exfiltration_via_datasync_task_filter`'
how_to_implement: You must install splunk AWS add on and Splunk App for AWS. This
  search works with AWS CloudTrail logs.
known_false_positives: It is possible that an AWS Administrator or a user has legitimately created this job for some tasks. 
references:
- https://hackingthe.cloud/aws/exploitation/s3-bucket-replication-exfiltration/
- https://bleemb.medium.com/data-exfiltration-with-native-aws-s3-features-c94ae4d13436
tags:
  analytic_story:
  - Data Exfiltration
  asset_type: AWS Account
  confidence: 80
  impact: 80
  message: AWS Batch Job is created on account id - $aws_account_id$ from src_ip $src_ip$
  mitre_attack_id:
  - T1119
  observable:
  - name: src_ip
    type: IP Address
    role:
    - Attacker
  - name: aws_account_id
    type: Other
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - eventName
  - user_arn
  - src_ip
  - aws_account_id
  - userAgent
  risk_score: 64
  security_domain: threat
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1119/aws_exfil_datasync/cloudtrail.json
    sourcetype: aws:cloudtrail
    source: aws_cloudtrail
    update_timestamp: true