Uncommonly Used Port

Adversaries may use non-standard ports to exfiltrate information.

ID: T1509
Tactic Type: Post-Adversary Device Access
Tactic: Command And Control
Platform: Android, iOS
Version: 1.0

Procedure Examples

Name Description
Exodus

Exodus Two attempts to connect to port 22011 to provide a remote reverse shell.[2]

FlexiSpy

FlexiSpy can communicate with the command and control server over ports 12512 and 12514.[1]

Mitigations

Mitigation Description
Application Vetting

Application vetting reports may show network communications performed by the application, including hosts, ports, protocols, and URLs.

Detection

Detection would most likely be at the enterprise level, through packet and/or netflow inspection. Many properly configured firewalls may also naturally block command and control traffic over non-standard ports.

References