T1090.001 Internal Proxy Mappings

Adversaries may use an internal proxy to direct command and control traffic between two or more systems in a compromised environment. Many tools exist that enable traffic redirection through proxies or port redirection, including HTRAN, ZXProxy, and ZXPortMap. (Citation: Trend Micro APT Attack Tools) Adversaries use internal proxies to manage command and control communications inside a compromised environment, to reduce the number of simultaneous outbound network connections, to provide resiliency in the face of connection loss, or to ride over existing trusted communications paths between infected systems to avoid suspicion. Internal proxy connections may use common peer-to-peer (p2p) networking protocols, such as SMB, to better blend in with the environment.

By using a compromised internal system as a proxy, adversaries may conceal the true destination of C2 traffic while reducing the need for numerous connections to external systems.



Capability ID Capability Description Mapping Type ATT&CK ID ATT&CK Name
AC-4 Information Flow Enforcement Protects T1090.001 Internal Proxy
CA-7 Continuous Monitoring Protects T1090.001 Internal Proxy
CM-2 Baseline Configuration Protects T1090.001 Internal Proxy
CM-6 Configuration Settings Protects T1090.001 Internal Proxy
CM-7 Least Functionality Protects T1090.001 Internal Proxy
SC-7 Boundary Protection Protects T1090.001 Internal Proxy
SI-3 Malicious Code Protection Protects T1090.001 Internal Proxy
SI-4 System Monitoring Protects T1090.001 Internal Proxy
action.malware.variety.C2 Command and control (C2) related-to T1090.001 Proxy: Internal Proxy
amazon_guardduty Amazon GuardDuty technique_scores T1090.001 Internal Proxy
amazon_virtual_private_cloud Amazon Virtual Private Cloud technique_scores T1090.001 Internal Proxy