February 14, 2024 at 11:59AM
The Bumblebee loader, known for delivering various malware, has reappeared in the US targeting organizations after a four-month hiatus. The recent campaign uses email with OneDrive URLs to initiate attacks, signaling a surge in cybercriminal activity. Interestingly, the attackers have employed VBA macro-enabled documents, a tactic rarely used since Microsoft’s macro blocking. Organizations are urged to stay vigilant and adopt basic security practices to mitigate risks.
Key Takeaways from Meeting Notes:
1. The Bumblebee loader has re-emerged in the threat landscape after a four-month hiatus, targeting thousands of US organizations with a new email campaign using malicious Microsoft OneDrive URLs.
2. Proofpoint’s Threat Research Team identified the new campaign, noting that it introduces several changes in attack tactics, including the use of VBA macro-enabled documents, a tactic uncommon since Microsoft began blocking macros by default in 2022.
3. The recent campaign utilizes VBA macro-enabled documents to execute a PowerShell command to download and run a Bumblebee DLL file, marking a departure from Bumblebee’s pre-hiatus campaigns which used different attack chains and had minimal employment of macro-laden content.
4. While the recent Bumblebee campaign is not attributed to any specific threat actor, Proofpoint highlighted indicators of compromise (IoC) and urged organizations to be vigilant against this campaign and employ security best practices such as employee training on identifying phishing and targeted scams, and implementing email security-scanning software.
5. The resurgence of Bumblebee is indicative of a surge in cybercriminal threat activity, and organizations are warned to remain vigilant and expect high levels of threat activity to continue until summer.
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