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Malware

Rustonotto

aka CHILLYCHINO

Rustonotto, active since June 2025, is a Rust-compiled malware, representing the first known instance of APT37 leveraging Rust-based malware to target Windows systems.

Rustonotto, also known as CHILLYCHINO, is a Windows malware family operated by APT37.

Background

In operation since June 2025, Rustonotto is malware compiled from Rust and marks the first documented case of APT37 using a Rust-based payload against Windows targets.

Source: Malpedia (Fraunhofer FKIE).