Detection rules › Sigma
AWS IAM S3Browser User or AccessKey Creation
Detects S3 Browser utility creating IAM User or AccessKey.
Known false positives
- Valid usage of S3 Browser for IAM User and/or AccessKey creation
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | |
| Execution | |
| Persistence | |
| Privilege Escalation | |
| Stealth |
Telemetry coverage
Rules detecting the same action
These rules filter on the same operation.
- AWS IAM Backdoor Users Keys (Sigma)
- AWS IAM Create User via Assumed Role on EC2 Instance (Elastic)
- AWS IAM Credentials Added to a Bedrock API Key Phantom User (Elastic)
- AWS IAM Sensitive Operations via Lambda Execution Role (Elastic)
- AWS IAM User Created Access Keys For Another User (Elastic)
- AWS IAM User Self-Created Access Key Subsequently Used (Elastic)
- AWS Sensitive IAM Operations Performed via CloudShell (Elastic)
- AWS User API Key Created (Panther)
Rule body
title: AWS IAM S3Browser User or AccessKey Creation
id: db014773-d9d9-4792-91e5-133337c0ffee
status: test
description: Detects S3 Browser utility creating IAM User or AccessKey.
references:
- https://permiso.io/blog/s/unmasking-guivil-new-cloud-threat-actor
author: daniel.bohannon@permiso.io (@danielhbohannon)
date: 2023-05-17
tags:
- attack.privilege-escalation
- attack.execution
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1059.009
- attack.t1078.004
logsource:
product: aws
service: cloudtrail
detection:
selection:
eventSource: 'iam.amazonaws.com'
eventName:
- 'CreateUser'
- 'CreateAccessKey'
userAgent|contains: 'S3 Browser'
condition: selection
falsepositives:
- Valid usage of S3 Browser for IAM User and/or AccessKey creation
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
eventSource: 'iam.amazonaws.com'
eventName:
- 'CreateUser'
- 'CreateAccessKey'
userAgent|contains: 'S3 Browser'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
eventName | eq |
| field:"aws::eventName" kind:eq |
eventSource | eq |
| field:"aws::eventSource" kind:eq value:"iam.amazonaws.com" |
userAgent | match |
| field:"userAgent" kind:match value:"S3 Browser" |