ESET researchers analyzed the Gentlemen ransomware-as-a-service (RaaS) operation, highlighting their unique approach of providing an in-house developed EDR killer framework, GentleKiller, directly to affiliates. The framework leverages Bring Your Own Vulnerable Driver (BYOVD) techniques to terminate over 400 security processes and is augmented by third-party tools like HexKiller and HavocKiller, all standardized with a shared defense-evasion layer.
Themida
2 posts
Killing me gently: Inside Gentlemen’s EDR killer framework Gremlin Stealer's Evolved Tactics: Hiding in Plain Sight With Resource Files Gremlin stealer has evolved from a basic credential harvester into a sophisticated, modular infostealer capable of active financial fraud and live session hijacking. Recent variants employ advanced anti-analysis techniques, including Themida packing, .NET resource section payload hiding with XOR encryption, and extensive code obfuscation, significantly complicating static detection efforts.
