splunk-security_content/docs/_posts/2021-07-19-aws_createaccesskey.md

title, excerpt, categories, last_modified_at, toc, tags

title	excerpt	categories	last_modified_at	toc	tags
AWS CreateAccessKey	Cloud Account	Cloud	2021-07-19	true	Hunting T1136.003 Cloud Account Persistence Splunk Security Analytics for AWS Splunk Enterprise Splunk Enterprise Security Splunk Cloud Actions on Objectives

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Description

This search looks for AWS CloudTrail events where a user A who has already permission to create access keys, makes an API call to create access keys for another user B. Attackers have been know to use this technique for Privilege Escalation in case new victim(user B) has more permissions than old victim(user B)

• Type: Hunting
• Product: Splunk Security Analytics for AWS, Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel:
• Last Updated: 2021-07-19
• Author: Bhavin Patel, Splunk
• ID: 2a9b80d3-6340-4345-11ad-212bf3d0d111

ATT&CK

ID	Technique	Tactic
T1136.003	Cloud Account	Persistence

Search

`cloudtrail` eventName = CreateAccessKey userAgent !=console.amazonaws.com errorCode = success
| search userIdentity.userName!=requestParameters.userName  
|  stats count min(_time) as firstTime max(_time) as lastTime  by requestParameters.userName src eventName eventSource aws_account_id errorCode userAgent eventID awsRegion userIdentity.principalId user_arn 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)`
|`aws_createaccesskey_filter`

Associated Analytic Story

• AWS IAM Privilege Escalation

How To Implement

You must install splunk AWS add on and Splunk App for AWS. This search works with AWS CloudTrail logs.

Required field

• _time
• eventName
• userAgent
• errorCode
• requestParameters.userName

Kill Chain Phase

• Actions on Objectives

Known False Positives

While this search has no known false positives, it is possible that an AWS admin has legitimately created keys for another user.

RBA

Risk Score	Impact	Confidence	Message
63.0	70	90	User user_arn is attempting to create access keys for requestParameters.userName from this IP src

Reference

• https://labs.bishopfox.com/tech-blog/privilege-escalation-in-aws
• https://rhinosecuritylabs.com/aws/aws-privilege-escalation-methods-mitigation-part-2/

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

• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078/aws_createaccesskey/aws_cloudtrail_events.json

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