[MART] - Daily Diary #607 - Bumblebee Loader Evolves

ctas-mat at appgate.com ctas-mat at appgate.com
Mon Oct 3 22:35:13 UTC 2022


I hope everyone is doing well!

Below is the entry for today.

10/03/2022 - Diary entry #607:

Bumblebee is a very advanced malware-as-a-service threat – covered in our Daily Diaries #499, #541, and #592 –  that targets Windows systems using a highly obfuscated DLL and advanced anti-analysis techniques. Bumblebee was found to replace BazaLoader as the infection vector in some campaigns in April this year. Since then, it has been adopted by different threat actors due to its success and constant evolution.

Recently, it was revealed that attackers shifted their focus from testing Bumblebee to infecting as many victims as possible, increasing the volume of Command & Control traffic. The loader’s system was also suddenly changed from using ISO files to VHD files containing a PowerShell script, then back again in a matter of days. Finally, the variety of payloads delivered by Bumblebee changed based on the type of victim, delivering banking trojans and info stealers to standalone hosts and post-exploitation tools such as CobaltStrike to organizations.

Therefore, as Bumblebee gets increasingly adopted and improved, we expect a rise in cyber attacks involving this malware. However, the fact that Bumblebee is a unique malware loader can help on identifying and blocking it.

Kind Regards,


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Malware Analysis and Research Team


E: ctas-mat at appgate.com<mailto:ctas-mat at appgate.com>

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