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Several threat groups believed to be initial access facilitators for some ransomware gangs are transitioning to a new first-stage malware downloader dubbed Bumblebee. The groups previously used other downloaders like BazaLoader and IcedID.

According to researchers from security firm Proofpoint, Bumblebee email-based distribution campaigns started in March and were linked back to at least three known attack groups. The malware is used to deploy known penetration testing implants such as Cobalt Strike, Sliver and Meterpreter. Attackers have adopted these attack frameworks and other open-source dual-use tools in recent years to engage in hands-on manual hacking and lateral movement through victim networks.

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