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ATT&CK Techniques
T1071.003 Mail Protocols

T1071.003 Mail Protocols Mappings

Adversaries may communicate using application layer protocols associated with electronic mail delivery to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.

Protocols such as SMTP/S, POP3/S, and IMAP that carry electronic mail may be very common in environments. Packets produced from these protocols may have many fields and headers in which data can be concealed. Data could also be concealed within the email messages themselves. An adversary may abuse these protocols to communicate with systems under their control within a victim network while also mimicking normal, expected traffic.

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Mappings

Capability ID	Capability Description	Mapping Type	ATT&CK ID	ATT&CK Name
AC-4	Information Flow Enforcement	Protects	T1071.003	Mail Protocols
CA-7	Continuous Monitoring	Protects	T1071.003	Mail Protocols
CM-2	Baseline Configuration	Protects	T1071.003	Mail Protocols
CM-6	Configuration Settings	Protects	T1071.003	Mail Protocols
CM-7	Least Functionality	Protects	T1071.003	Mail Protocols
SC-10	Network Disconnect	Protects	T1071.003	Mail Protocols
SC-20	Secure Name/address Resolution Service (authoritative Source)	Protects	T1071.003	Mail Protocols
SC-21	Secure Name/address Resolution Service (recursive or Caching Resolver)	Protects	T1071.003	Mail Protocols
SC-22	Architecture and Provisioning for Name/address Resolution Service	Protects	T1071.003	Mail Protocols
SC-23	Session Authenticity	Protects	T1071.003	Mail Protocols
SC-31	Covert Channel Analysis	Protects	T1071.003	Mail Protocols
SC-37	Out-of-band Channels	Protects	T1071.003	Mail Protocols
SC-7	Boundary Protection	Protects	T1071.003	Mail Protocols
SI-3	Malicious Code Protection	Protects	T1071.003	Mail Protocols
SI-4	System Monitoring	Protects	T1071.003	Mail Protocols
action.malware.variety.Backdoor or C2	Malware creates a remote control capability, but it's unclear if it's a backdoor for hacking or C2 for malware. Parent of 'C2' and 'Backdoor'.	related-to	T1071.003	Application Layer Protocol: Mail Protocols
action.malware.variety.C2	Malware creates Command and Control capability for malware. Child of 'Backdoor or C2'.	related-to	T1071.003	Application Layer Protocol: Mail Protocols
action.malware.variety.Unknown	Unknown	related-to	T1071.003	Application Layer Protocol: Mail Protocols