AsyncRAT Installer Inbound via HTTP

Tim Peck@timpeck

•updated Nov 10, 2025•0•21

This rule detects the inbound transfer of an AsyncRAT installer executable over HTTP. It specifically looks for HTTP responses with a content-type of 'application/x-msdownload', a 'content-disposition' header indicating an attachment named 'asyncclient.exe', and the presence of 'cloudflare.com' in the HTTP response body, along with the 'MZ' header indicating a Windows executable.