Hackers Exploit RVTools to Deploy Bumblebee Malware on Windows Systems

A reliable VMware environment reporting tool, RVTools, was momentarily infiltrated earlier this week on May 13, 2025, to disseminate the sneaky Bumblebee loader virus, serving as a sobering reminder of the vulnerabilities present in software supply chains.

This incident, detected by a security operations team through a high-confidence alert from Microsoft Defender for Endpoint, revealed a sophisticated attack vector where a seemingly legitimate installer became a conduit for malicious payloads.

An employee attempting to install RVTools triggered the alert as Defender flagged a suspicious file, version.dll, executing from the installer’s directory-a behavior highly atypical for this widely trusted utility used across enterprises for VMware environment analysis.

This breach underscores the growing threat of supply chain attacks, where even established tools can be weaponized by adversaries to infiltrate secure systems.

Supply Chain Attack Targets Trusted VMware Utility

Upon deeper investigation, the compromised RVTools installer was found to contain a ...