T1041 — Exfiltration Over C2 Channel

Technique: T1041
Tactics: Exfiltration
MISP citations: 0
KEV CVEs mapped: 12
Community rules: 5
thrunt rules: 0
Upstream: https://attack.mitre.org/techniques/T1041

MITRE description

Adversaries may steal data by exfiltrating it over an existing command and control channel. Stolen data is encoded into the normal communications channel using the same protocol as command and control communications.

KEV CVEs mapped to this technique

Per MITRE CTID's hand-curated KEV→ATT&CK mappings — these are the actively-exploited vulnerabilities behind this technique's KEV signal.

Detection coverage

SigmaHQ community rules

Equation Group C2 Communication (emerging-threats)
Shai-Hulud NPM Package Malicious Exfiltration via Curl (emerging-threats)
Tunneling Tool Execution (threat-hunting)
OpenCanary - TFTP Request (core)
Network Communication Initiated To Portmap.IO Domain (core)

Signal counts reflect the current corpus snapshot: MISP citations are regex-extracted from CIRCL OSINT event text and galaxy tags; KEV mappings come from MITRE CTID; community coverage is the SigmaHQ rule inventory (core, emerging-threats, threat-hunting collections) at release r2026-04-01. Rule bodies are not mirrored — links go upstream.