Sigma rule: AWS IAM S3Browser User or AccessKey Creation

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5be3cf0d6b8f, updated 2023-05-17T00:00:00.000Z.

Rule

Title
AWS IAM S3Browser User or AccessKey Creation
Status
test
Level
high
Author
[email protected] (@danielhbohannon)
Date
2023-05-17
File
rules/cloud/aws/cloudtrail/aws_iam_s3browser_user_or_accesskey_creation.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects S3 Browser utility creating IAM User or AccessKey.

Log source

product
aws
service
cloudtrail

Detection

selection:
    eventSource: 'iam.amazonaws.com'
    eventName:
        - 'CreateUser'
        - 'CreateAccessKey'
    userAgent|contains: 'S3 Browser'
condition: selection

False positives (as the rule lists them)

  • Valid usage of S3 Browser for IAM User and/or AccessKey creation

Tags

  • attack.privilege-escalation
  • attack.execution
  • attack.persistence
  • attack.initial-access
  • attack.stealth
  • attack.t1059.009
  • attack.t1078.004

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_iam_s3browser_user_or_accesskey_creation.yml

Sources and licences

  • SigmaHQ

    "AWS IAM S3Browser User or AccessKey Creation" by [email protected] (@danielhbohannon) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/aws/cloudtrail/aws_iam_s3browser_user_or_accesskey_creation.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: AWS IAM S3Browser User or AccessKey Creation",
entity page, dataset version ref-5be3cf0d6b8f, updated 2023-05-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/db014773-d9d9-4792-91e5-133337c0ffee (accessed 2026-11-03).
Underlying source: SigmaHQ rule db014773-d9d9-4792-91e5-133337c0ffee, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.