Minimal Header Github Request for PNG File
This rule detects HTTP GET requests for PNG files from github.com with a minimal set of HTTP headers. Specifically, it looks for requests where the total size of HTTP header names is less than 30 bytes and explicitly excludes common headers like 'user-agent', 'referer', 'accept', 'x-auth', and 'cookie'. This pattern could indicate an attempt to exfiltrate data or perform other covert communication using a simplified HTTP client, potentially to evade detection by security tools that expect full browser-like headers.
Suricata
