HTML Smuggling via Blob URL Payload Delivery
This rule detects potential HTML smuggling attempts where a malicious payload is delivered via a Blob URL. It specifically looks for HTTP responses (flow:to_client) that contain both 'URL.createObjectURL' and 'Blob(' (case-insensitive) in the file data. This combination is indicative of JavaScript code creating a Blob object and then generating a URL for it, which can be used to deliver files directly to the client's browser, bypassing traditional network security controls.
Suricata
