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01flip: Rust-Based Multi-Platform Ransomware Targeting APAC

🔐 Unit 42 identified 01flip, a new Rust‑based ransomware family observed in June 2025 that targets both Windows and Linux via Rust cross‑compilation. The malware enumerates writable directories, drops RECOVER-YOUR-FILE.TXT ransom notes, renames files with a .01flip extension, and encrypts victims with AES‑128‑CBC while protecting session keys with an embedded RSA‑2048 public key. Observed victims are a limited set in the Asia‑Pacific region, and an alleged data dump appeared on a dark‑web forum after at least one infection.