software
BRUSHFIRE
[BRUSHFIRE](https://attack.mitre.org/software/S9011) is a passive backdoor written in C that executes in-memory within an existing process. First reported in March 2025, [BRUSHFIRE](https://attack.mitre.org/software/S9011) has been observed in activity attributed to People's Republic of China (PRC) state-affiliated threat actors, including UNC5221 and SYLVANITE.(Citation: Dragos SYLVANITE MuddyWater Electrum March 2026)(Citation: Google UNC5221 Ivanti April 2025)(Citation: Picus Security UNC5221
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- id
- brushfire
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- software
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- active
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- attack S9011via mitre-attack
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