New Qilin ransomware encryptor features stronger encryption, evasion

Qilin.B is a Rust-based evolution of the Qilin (Agenda) ransomware that adds AES-256-CTR with AES‑NI acceleration (with ChaCha20 fallback), RSA‑4096/OAEP key protection, registry persistence, termination of backup and security processes (e.g., Veeam, VSS, Sophos, Acronis), shadow copy deletion, and registry changes to share network drives; Halcyon published IOCs and the family has been tied to prior impactful attacks and an info-stealer component.