MITRE ATT&CKsoftware (malware)

S9011 BRUSHFIRE

Published 2026-04-13 Modified 2026-04-23 Official page ↗
Domain
enterprise
Platforms
Linux, Network Devices
Version
1.0
Created
2026-04-13

Description

BRUSHFIRE is a passive backdoor written in C that executes in-memory within an existing process. First reported in March 2025, BRUSHFIRE has been observed in activity attributed to People's Republic of China (PRC) state-affiliated threat actors, including UNC5221 and SYLVANITE.

Related

Uses · MITRE ATT&CK (4)

  • T1620 Reflective Code Loading technique
  • T1048.002 Exfiltration Over Asymmetric Encrypted Non-C2 Protocol sub-technique
  • T1205 Traffic Signaling technique
  • T1140 Deobfuscate/Decode Files or Information technique

References