Adversaries may steal data by exfiltrating it over an asymmetrically encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.
Asymmetric encryption algorithms are those that use different keys on each end of the channel. Also known as public-key cryptography, this requires pairs of cryptographic keys that can encrypt/decrypt data from the corresponding key. Each end of the communication channels requires a private key (only in the procession of that entity) and the public key of the other entity. The public keys of each entity are exchanged before encrypted communications begin.
Network protocols that use asymmetric encryption (such as HTTPS/TLS/SSL) often utilize symmetric encryption once keys are exchanged. Adversaries may opt to use these encrypted mechanisms that are baked into a protocol.
View in MITRE ATT&CK®| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| network_security_groups | Network Security Groups | technique_scores | T1048.002 | Exfiltration Over Asymmetric Encrypted Non-C2 Protocol |
Comments
This control can reduce the protocols available for data exfiltration. Temporal immediate, coverage substantial.
References
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| azure_firewall | Azure Firewall | technique_scores | T1048.002 | Exfiltration Over Asymmetric Encrypted Non-C2 Protocol |
Comments
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.
References
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| azure_network_traffic_analytics | Azure Network Traffic Analytics | technique_scores | T1048.002 | Exfiltration Over Asymmetric Encrypted Non-C2 Protocol |
Comments
This control can identify anomalous traffic with respect specific ports (though it can't identify presence or lack of encryption).
References
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