BRUSHFIRE — Malware Profile
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.
MITRE ATT&CK techniques (4)
- T1048.002 Exfiltration Over Asymmetric Encrypted Non-C2 Protocol
- T1140 Deobfuscate/Decode Files or Information
- T1205 Traffic Signaling
- T1620 Reflective Code Loading