The malware-as-a-service operation launches legitimate browsers on an invisible desktop, giving attackers persistent and covert remote access to compromised Windows systems.
Researchers say the OnyxC2 malware targets more than 200 applications and extensions while evading detection through encrypted payloads, DLL sideloading, and in-memory execution techniques.
As attackers increasingly favor stolen credentials over exploits, infostealers have become a primary source of access for ransomware and other cybercrime operations.
Researchers warn GreyVibe’s extensive use of ChatGPT, Gemini, and other AI tools offers a glimpse into how future cybercriminal and state-aligned groups will operate.