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.

Linked Issues

Issuelinks
Linktyp Issue
is related to Techniques
is blocked by Network Intrusion Prevention
is blocked by Detection of Exfiltration Over Asymmetric Encrypted Non-C2 Protocol
is blocked by Network Segmentation
is blocked by Filter Network Traffic
is blocked by Data Loss Prevention
is blocked by Provenance
is blocked by Security, Compliance & Resilience Controls Oversight
is blocked by Secure Baseline Configurations
is blocked by Least Functionality
is blocked by Continuous Monitoring
is blocked by Covert Channel Analysis
is blocked by Encrypting Data At Rest
is blocked by Cybersecurity & Data Protection Attributes
is blocked by Use of External Technology Assets, Applications and/or Services (TAAS)
is blocked by Data Mining Protection
is blocked by Malicious Code Protection (Anti-Malware)
is blocked by Account Management
is blocked by Access Enforcement
is blocked by Least Privilege
is blocked by Cross Domain Solution (CDS)
is blocked by Boundary Protection
is blocked by Data Flow Enforcement – Access Control Lists (ACLs)
is blocked by Interconnection Security Agreements (ISAs)
is blocked by Secure Engineering Principles
is blocked by Information Output Filtering
is blocked by Input Data Validation
is blocked by Third-Party Services
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