T1048.002 Exfiltration Over Asymmetric Encrypted Non-C2 Protocol

This diagnostic statement provides for implementation of methods to block similar future attacks via security tools such as antivirus and IDS/IPS to provide protection against threats and exploitation attempts.

This diagnostic statement protects against Exfiltration Over Asymmetric Encrypted Non-C2 Protocol through the use of failsafes, backup facilities, disaster recovery, and resilience strategies including resumption of critical services.

This diagnostic statement provides protection from Exfiltration Over Asymmetric Encrypted Non-C2 Protocol by using tools to detect and block the use of unauthorized devices and connections to prevent abuse by adversaries.

The use of data loss prevention controls may mitigate the techniques related to data leakage and loss from local systems, automated exfiltration, and exfiltration over non-approved services.

This diagnostic statement is for the implementation of network segmentation which helps prevent access to critical systems and sensitive information. Network firewall configurations that allow only necessary ports and traffic can mitigate exfiltration of data over alternate protocols.

This diagnostic statement describes how the organization establishes and manages baseline measures of network activity. Supported by network monitoring tools and other controls to detect events and identify incidents. Mitigating mechanisms may include: Data Loss Prevention (DLP); Filtering Network Traffic; Limit Network Traffic; Network Intrusion Prevention Systems (NIPS); and Network Segmentation for these type of network-based techniques.

This diagnostic statement provides protection through secure network device configurations (e.g., firewall rules, ports, protocols) aligned to security baselines. Using network appliances to block or filter network traffic that is not necessary within the environment can mitigate adversary use of alternate protocols to exfiltrate data.

This diagnostic statement protects against Exfiltration Over Asymmetric Encrypted Non-C2 Protocol through the use of secure network configurations, architecture, implementations of zero trust architecture, and segmentation.

This diagnostic statement provides protections for wireless networks. Implementation of wireless network management measures such as network segmentation and access controls reduces the attack surface, restricts movement by adversaries, and protects data from compromise.

This diagnostic statement protects against Exfiltration Over Asymmetric Encrypted Non-C2 Protocol through the use of limiting access to resources to only authorized devices, management of personal computing devices, network intrusion prevention, and the use of antimalware.

This control's threat intelligence-based filtering feature can be enabled to alert and deny traffic from/to known malicious IP addresses and domains. The IP addresses and domains are sourced from the Microsoft Threat Intelligence feed. Because this protection is limited to known malicious IP addresses and domains and does not provide protection from such attacks from unknown domains and IP addresses, this is scored as partial coverage resulting in an overall Partial score.

This control can reduce the protocols available for data exfiltration. Temporal immediate, coverage substantial.

This control can identify anomalous traffic with respect specific ports (though it can't identify presence or lack of encryption).

VPC security groups and network access control lists (NACLs) can limit access to the minimum required ports and therefore protect against adversaries attempting to exfiltrate data using a different protocol than that of the existing command and control channel. In environments where unrestricted Internet access is required, security groups and NACLs can still be used to block known malicious endpoints. Because in such environments the protection is limited to known malicious IP addresses and domains and does not provide protection from such attacks from unknown domains and IP addresses, this is scored as partial coverage resulting in an overall Partial score.

The following AWS IoT Device Defender device-side detection metrics can detect indicators that an adversary may be exfiltrating collected data from compromised AWS IoT devices over a given channel to/from those devices: "Destination IPs" ("aws:destination-ip-addresses") outside of expected IP address ranges may suggest that a device is communicating with unexpected parties. "Bytes in" ("aws:all-bytes-in"), "Bytes out" ("aws:all-bytes-out"), "Packets in" ("aws:all-packets-in"), and "Packets out" ("aws:all-packets-out") values outside of expected norms may indicate that the device is sending and/or receiving non-standard traffic, which may include exfiltration of stolen data. "Listening TCP ports" ("aws:listening-tcp-ports"), "Listening TCP port count" ("aws:num-listening-tcp-ports"), "Established TCP connections count" ("aws:num-established-tcp-connections"), "Listening UDP ports" ("aws:listening-udp-ports"), and "Listening UDP port count" ("aws:num-listening-udp-ports") values outside of expected norms may indicate that devices are communicating via unexpected ports/protocols, which may include exfiltration of data over those ports/protocols. Coverage factor is partial, since these metrics are limited to exfiltration from IoT devices, resulting in an overall score of Partial.

AWS Network Firewall has the ability to pass, drop, or alert on traffic based on the network protocol as well as perform deep packet inspection on the payload. This functionality can be used to block adversaries from accessing resources from which to exfiltrate data as well as prevent resources from communicating with known-bad IP addresses and domains that might be used to receive exfiltrated data. This mapping is given a score of Partial because the known-bad IP addresses and domains would need to be known in advance and AWS Network Firewall wouldn't have deep packet inspection visibility into encrypted non-C2 protocols.