BumbleBee is a malware loader that specifically targets Windows computers. Initially discovered in March 2022, it has marked over a year of continuous evolution since its emergence. Since its early stages, BumbleBee was under active development. With consistent refinement and the integration of new features, the latest version of the loader has been released, equipped with the capability to download additional code and employ numerous evasion techniques that obstruct both manual and dynamic analysis.
Understanding and combating the BumbleBee loader malware is crucial, as it has become a significant threat, orchestrating high-profile attacks against a wide variety of organizations, ranging from financial institutions to government agencies. This loader is highly adept at deploying supplementary payloads and executing anti-analysis maneuvers. Utilizing malspam campaigns and spear-phishing attacks as primary entry points, BumbleBee represents a tangible risk to organizations.This paper provides a concise summary of BumbleBee's behavior, key features, and salient aspects based on the in-depth research conducted by the VMRay Labs Team.