How to Build a 404 page not found C2
Summary
This article describes how to build a Command and Control (C2) server disguised as a 404 "page not found" error. This technique can be used by attackers to evade detection by hiding their C2 traffic within common web traffic patterns.
IFF Assessment
FOE
This article details a technique that can be used by attackers to establish command and control over compromised systems, which is detrimental to defenders.
Defender Context
Defenders should be aware of techniques that blend malicious C2 traffic with legitimate web requests, such as disguising C2 as 404 errors. Monitoring for unusual traffic patterns, unexpected server responses, and anomalies in web server logs can help detect such evasion tactics.