Adversaries may communicate using publish/subscribe (pub/sub) application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Protocols such as <code>MQTT</code>, <code>XMPP</code>, <code>AMQP</code>, and <code>STOMP</code> use a publish/subscribe design, with message distribution managed by a centralized broker.(Citation: wailing crab sub/pub)(Citation: Mandiant APT1 Appendix) Publishers categorize their messages by topics, while subscribers receive messages according to their subscribed topics.(Citation: wailing crab sub/pub) An adversary may abuse publish/subscribe protocols to communicate with systems under their control from behind a message broker while also mimicking normal, expected traffic.
View in MITRE ATT&CK®| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| action.malware.variety.C2 | Malware creates Command and Control capability for malware. Child of 'Backdoor or C2'. | related-to | T1071.005 | Publish/Subscribe Protocols | |
| action.malware.variety.Evade Defenses | Modification of the action (rather than the system, as in 'Disable controls') to avoid detection. | related-to | T1071.005 | Publish/Subscribe Protocols |