AWS IAM S3Browser LoginProfile Creation

calendar Oct 23, 2025 · attack.execution attack.persistence attack.defense-evasion attack.initial-access attack.privilege-escalation attack.t1059.009 attack.t1078.004  ·
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Detects S3 Browser utility performing reconnaissance looking for existing IAM Users without a LoginProfile defined then (when found) creating a LoginProfile.

Sigma rule (View on GitHub)

 1title: AWS IAM S3Browser LoginProfile Creation
 2id: db014773-b1d3-46bd-ba26-133337c0ffee
 3status: test
 4description: Detects S3 Browser utility performing reconnaissance looking for existing IAM Users without a LoginProfile defined then (when found) creating a LoginProfile.
 5references:
 6    - https://permiso.io/blog/s/unmasking-guivil-new-cloud-threat-actor
 7author: daniel.bohannon@permiso.io (@danielhbohannon)
 8date: 2023-05-17
 9tags:
10    - attack.execution
11    - attack.persistence
12    - attack.defense-evasion
13    - attack.initial-access
14    - attack.privilege-escalation
15    - attack.t1059.009
16    - attack.t1078.004
17logsource:
18    product: aws
19    service: cloudtrail
20detection:
21    selection:
22        eventSource: 'iam.amazonaws.com'
23        eventName:
24            - 'GetLoginProfile'
25            - 'CreateLoginProfile'
26        userAgent|contains: 'S3 Browser'
27    condition: selection
28falsepositives:
29    - Valid usage of S3 Browser for IAM LoginProfile listing and/or creation
30level: high

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