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NEW BUMBLEBEE MALWARE LOADER INCREASINGLY ADOPTED BY CYBER THREAT GROUPS

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on June 28, 2022, 3:00 AM PDT


NEW BUMBLEBEE MALWARE LOADER INCREASINGLY ADOPTED BY CYBER THREAT GROUPS

Conti, Quantum and Mountlocker were all linked to having used the new piece of
software to inject systems with ransomware.

Image: iStockphoto/solarseven

A recently uncovered malware loader called Bumblebee has been found to be
connected to a number of prominent ransomware groups and has been a key
component of many cyberattacks. New findings by the Symantec Threat Hunter Team,
part of Broadcom Software, discovered that the tool has links to threat groups
such as Conti, Quantum and Mountlocker, per the team’s blog entry.

According to Symantec’s Threat Hunter Team, the Bumblebee loader may have been
used as a replacement for Trickbot and BazarLoader, due to the overlap in recent
activity involving Bumblebee and older attacks linked to these loaders.

“[Bumblebee] appears to have replaced a number of older loaders, which suggests
that it is the work of established actors and that the transition to Bumblebee
was pre-planned,” the team wrote in its blog post.


HOW THE BUMBLEBEE LOADER BECOMES A THREAT


MUST-READ SECURITY COVERAGE

 * 85% of Android users are concerned about privacy
 * Almost 2,000 data breaches reported for the first half of 2022
 * In security, there is no average behavior
 * How to secure your email via encryption, password management and more
   (TechRepublic Premium)

One particular attack singled out by the team stemming from Quantum ransomware
detailed how the Bumblebee loader is put into practice. The initial infection
came through use of a spear-phishing email, which had an attachment of an ISO
file. The malicious file in question was equipped with a Bumblebee DLL file and
a LNK file, which then loaded the Bumblebee file using rundll32.exe.

The Bumblebee loader allegedly then contacted a command-and-control server
according to the team, and created a duplicate file within the %APPDATA% folder
with a randomized name. In conjunction with this, a VBS file was also created
within the same location. Then, the loader organized a scheduled task to run the
VBS file every 15 minutes. After a few hours had passed, the loader dropped a
Cobalt Strike payload. This action led to two additional points: One being that
Metasploit DLL was injected into a legitimate Windows process and the second
coming from an AdFind tool to collect system information such as domain users
and group permissions for the system.

After this task was completed, the Quantum ransomware was unloaded by Bumblebee,
allowing the ransomware group to encrypt files of the targeted system. Once in
the system, Quantum then was able to scrape the system for user information
using Windows Management Instrumentation. The ransomware payload also disabled
any processes related to malware identification.

SEE: Mobile device security policy (TechRepublic Premium)


BUMBLEBEE’S CONNECTION TO PREVIOUS ATTACKS

Due to Bumblebee’s use of the tools formerly mentioned, it is believed by the
Threat Hunter Team that there is a connection between the new loader and ones
used previously by cybercriminal groups. One such link comes from the use of
AdFind, a publicly available tool for querying Active Directory and having been
used by other adversaries in the past. The deployment of an ISO file with the
intent to infect a system was also the initial infection point for victims in
previous attacks, dating back as far as June of 2021 and used by threat groups
Ryuk and Conti.

Another link comes from the use of a batch script known as adf.bat. The batch
script has been tied to cyberattacks going back to November 2021, along with the
use of the AdFind tool in these attacks. In that case, the loader was determined
to be BazarLoader.

Many of the attacks being investigated by the Threat Hunter Team also found the
use of legitimate software tools within the attacks themselves. For
organizations employing remote desktop tools this can cause major issues, having
been linked to a number of ransomware deployments and data exfiltration
purposes. Symantec’s team recommends that users and enterprises be on the
lookout for this new malware loader and the capabilities it possesses.


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