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AWS S3 Static Site JavaScript File Uploaded

This rule detects when a JavaScript file is uploaded in an S3 static site directory (`static/js/`) by an IAM user or assumed role. This can indicate suspicious modification of web content hosted on S3, such as…

Description

This rule detects when a JavaScript file is uploaded in an S3 static site directory (`static/js/`) by an IAM user or assumed role. This can indicate suspicious modification of web content hosted on S3, such as injecting malicious scripts into a static website frontend.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ESXiIaaSLinuxmacOSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Known benign triggers

  • Development or deployment pipelines that update static frontends frequently (e.g., React/Vue apps) may trigger this. Verify the user agent, source IP, and whether the modification was expected.

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