[MiniFast](https://attack.mitre.org/software/S9052) is a custom malware designed for long-term persistence and remote code execution. [MiniFast](https://attack.mitre.org/software/S9052) is a modular malware suspected of being generated using artificial intelligence (AI). [MiniFast](https://attack.mitre.org/software/S9052) was first observed in early-2026 and is a modified version of the [MiniJunk](https://attack.mitre.org/software/S9053) framework. [MiniFast](https://attack.mitre.org/software/S9052) has been affiliated with the cyber espionage threat group [NIMBUS MANTICORE](https://attack.mitre.org/groups/G1059).(Citation: CheckPoint_NimbusManticore_May2026)