Official Description

Adversaries may use an existing, legitimate external Web service to exfiltrate data rather than their primary command and control channel. Popular Web services acting as an exfiltration mechanism may give a significant amount of cover due to the likelihood that hosts within a network are already communicating with them prior to compromise. Firewall rules may also already exist to permit traffic to these services.

Web service providers also commonly use SSL/TLS encryption, giving adversaries an added level of protection.
Tactics
Exfiltration
Platforms
ESXi, Linux, macOS, Office Suite, SaaS, Windows
MITRE Version
1.5
Last Modified
May 12, 2026

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Sub-techniques (4)

Reported Context (3)

CVE (1)

Malware (4)

Threat Actors (2)

MITRE ATT&CK (37)

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Vendors (11)

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Products (20)

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Tools (5)

Industries (6)

Countries (7)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.