Does Decryption Help You Find Advanced Attacks? by Oliver Tavakoli

The report concludes that passively decrypting TLS traffic is operationally costly and largely ineffective for detecting advanced nation-state actors or manual RansomOps because attackers customize C2 and obfuscate inner payloads (illustrated with Cobalt Strike malleable C2). It advises defenders to prioritize traffic pattern, time-series and volume-anomaly detection over decrypted payload signature inspection.