Adversaries may obfuscate command and control traffic to make it more difficult to detect.(Citation: Bitdefender FunnyDream Campaign November 2020) Command and control (C2) communications are hidden (but not necessarily encrypted) in an attempt to make the content more difficult to discover or decipher and to make the communication less conspicuous and hide commands from being seen. This encompasses many methods, such as adding junk data to protocol traffic, using steganography, or impersonating legitimate protocols.
Detects excessive outbound traffic to remote host over HTTP(S) from uncommon or previously unseen processes.
Identifies custom or previously unseen userland processes initiating high-volume HTTP connections with low response volume.
Flags unexpected user applications initiating long-lived HTTP(S) sessions with irregular traffic patterns.